Focal length calculator from image. Assume the image width to be 5000 pixels.

Focal length calculator from image Use our calculator to master the fundamental equation that connects focal length to the world of images. Oct 7, 2020 · This article will help you calculate the correct lens focal length and camera sensor resolution for image acquisition. Some are examples from my telescope, a C11 SCT with 279. Figure out the best lenses for you with my Clear Image Zoom Calculator (aka The Lens Focal Length Calculator) If the lens is converging but the distance from the object to the lens is smaller than the focal length, the image will be virtual. This tool is especially Jun 4, 2024 · Estimating Image Distance If you have the object distance and focal length values available, utilize the calculator to estimate the image distance. A magnified, inverted image is located a distance of 32. Highlight the numbers already entered in the boxes and delete them and enter your own. Aug 14, 2024 · Enter the focal length (mm) and the crop factor into the Calculator. Diverging lenses always produce virtual images. 62 c m F=10. This example demonstrates how to use the calculator to determine the focal length needed for clear imaging. This feature is particularly useful in physics experiments and photography, providing an accurate prediction of the resulting image position. 0 cm from a concave mirror with a focal length of 12. Jun 2, 2024 · It is used to calculate the image distance and magnification of a thin lens, which are important parameters for designing optical systems. 62~\mathrm {cm} F =10. Apr 25, 2024 · Example of Focal Point Calculator Let’s calculate the focal length for a lens where the object distance is 30 cm and the image distance is 45 cm. A lens acts differently on a full-frame camera compared to a crop sensor camera. Explore a comprehensive collection of calculators for various fields including math, physics, biology, finance, and more. How to select camera focal length and flight altitude considering the desired Ground Sampling Distance and terrain to map: How to select Camera Focal Length and Flight Altitude considering the desired Ground Sampling Distance and Terrain to map? - PIX4Dmapper. What is a Concave Mirror Calculator? Definition: This calculator determines the focal length, image distance, magnification, and image height for a concave mirror based on object distance, radius of curvature, and object height. Most CCTV applications use a fixed-focal-length lens, which, like your eye's lens, covers a constant angular field of view. Feb 13, 2025 · The relationship between focal length, sensor size, object distance, and image distance is fundamental in photography and optics. Q: How does the focal length of a thin lens affect the image distance? A: The focal length of a thin lens is inversely proportional to the image distance. The first equation is defines the condition of focus and establishes a relationship between object distance xo, image distance xi and focal length f. Oct 14, 2024 · For lenses, the focal length is positive for converging lenses and negative for diverging lenses. Apart from the lens focal length calculator function this software has 3D engine for automatic design and visualization of all elements of video surveillance systems. Jul 26, 2016 · For a given focal length the angle of view will determine what we call lens image circle. Actual focal length could be determined by the Magnification (Wikipedia) and distance. Using the formula: 1/f = 1/30 + 1/45 Solving this gives a focal length of approximately 18 cm. Jul 3, 2025 · By inputting known values like object distance, image distance, curvature radius, or refractive index, users can calculate the focal length efficiently and accurately. Continue reading to learn about lens design and applications and how you can use our lens calculator to determine the focal length. This article will teach you the focal length equation and image distance formula. Oct 3, 2024 · What happens if the object distance is equal to the focal length? If \ (O = F\), the formula suggests an infinite image distance, implying the image forms at infinity. CCTV Camera Lens Calculator The function of the camera lens is to collect light reflected from the scene and focus it into an image onto the CCTV camera sensor. The image on a convex mirror is always virtual, diminished and upright. Sep 16, 2022 · The mirror equation calculator is a tool designed to help you with the problem of determining focal length or object and image distances for various mirrors. The focal length calculator allows you to compute magnification, angle of view as well as the focal length needed for a picture of a distant object. It is easy to note that once f and α are set the lens image circle is also fixed. Focal Length of Using a common lens focal length, use Calculator #2 to determine the working distance necessary to get your desired field of view. This calculator can also determine the image distance or object distance if the other values are known. Mar 7, 2025 · A: Focal length is a crucial parameter in optics as it determines the magnification and image formation properties of a lens. This calculator can simplify complex calculations and enhance your understanding of optical This is rather specialized, but people do ask how to determine or measure the distance or size of an object or subject in a photo image. Aug 6, 2022 · With this thin lens equation calculator, you can find the image distance from just the focal length of your lens and the object distance. Pixel Size: Enter the pixel size of the camera in microns. What is a Focusing Lens Calculator? Definition: This calculator determines the focal length, image distance, magnification, and F-number of a lens based on object distance, refractive index, radii of curvature, and diameter. Assume the image width to be 5000 pixels. To run, select the size of the sensor, either the horizontal or vertical field of view , the working distance to the target and then click the calculate button. It enables easy calculation of an appropriate lens focal length, camera viewing angle, IP camera bandwith, storage capacity for records archiving and of other camera system parameters. At a small focal length, the angle is large (wide-angle), at a large focal length, the angle is small (tele). Dec 25, 2024 · What is Field of View Calculator | Find the Viewing Distance, Calculate the Angle of View, Focal Length with FOV Calculator – 2025: A Field of View (FOV) Calculator is a practical tool that is designed to measure and estimate the visible area captured by a camera, telescope, or screen. It is the distance between the lens and the point Focal Length Calculator View All Technical Tools R1 (mm): OR Plano R2 (mm): OR Plano Object Space Index, nOS: Lens Index, nL: Image Space Index, nIS: Center Thickness, CT (mm): Effective Focal Length, EFL (mm): -- Back Focal Length, BFL (mm): -- Front Focal Length, FFL (mm): -- Primary Principal Point, P (mm): -- Secondary Principal Point, P Thin Lens Equation This CalcTown calculator calculates the image distance when the focal length and the object distance are given using Cartesian Coordinate Convention. Compute focal length, surface area, volume and more quickly and accurately. Q: Can I use this calculator for practical applications, such as photography or optics? A: Yes, the calculator is useful for understanding how lenses focus light in cameras, microscopes, and other optical devices. Our FOV calculator includes distortion correction for accurate real-world coverage predictions. Famous wide angle lenses throughout the history covered more than 90º. Calculator for geometrical optics problems. F/Stop and Pinhole Calculator Enter Focal Length: Enter Pinhole Diameter (optional): Calculating Result The film stop: Please enter the focal length The Optimum Pinhole Size: for focal length of MM is 0 MM Calculator designed by Zernike Au of Zero Image Co. In affect, over-sampling reduces field of view. Understanding focal length helps in selecting the right lens for cameras, telescopes, or other optical devices. Automatic tool for GSD calculation: TOOLS - GSD calculator. You can change the material's geometric settings and the refractive index. CCTV Calculator is a tool designated for camera system basic parameters determination and testing. If you’d like, you can enter magnification instead of object size and image size. Lenses with shorter focal lengths have higher magnification and wider fields of view. Calculate lens and mirror parameters: focal length, magnification, image position. Field of View Calculator — free FoV tool for camera lenses Calculate camera field of view (horizontal, vertical, diagonal) instantly from focal length and sensor size. Effortlessly calculate focal length, object distance, and image distance in optical systems with our Mirror Equation Calculator. Optimize setups with VA Imaging's powerful lens calculator. Field of View Calculator Test different telescope, camera & eyepiece combinations. In this article, we delve into the concept of optimal pinhole size, explore standard calculation methods, and provide practical charts for various focal lengths to help you achieve the best results in your pinhole photography endeavors. Variables Used Focal Length of Convex Lens - (Measured in Meter) - Focal Length of Convex Lens is the distance between the lens's vertex and the focal point, which is the point where parallel rays of light converge after passing through the lens. Focal length, image sensor format, lens optical format, image circle and Field of View are explained to show you how cameras work and how to choose a lens. Determine the focal length, object distance, image distance, and magnification for converging and diverging lenses. Image Distance - (Measured in Meter) - Image Distance is the distance between the image sensor and the lens in an optical system, affecting the magnification and quality of the resulting image. Compare different focal lengths and crop factors side by side with our interactive visualization tool. Use this calculator to determine the approximate coverage (field of view) and the ‘ground’ pixel size of a particular lens and camera at a given distance. The magnification calculator calculates magnification with the help of the focal length and distance of the object being provided. Dec 30, 2024 · The Lens and Mirror Equation Calculator is a powerful tool designed to assist you in solving optical problems using the lens and mirror equation. The shorter the lens focal length, the wider the field of view. Alternatively, instead of a 35mm equivalent, it can determine another equivalent, for example, APS-C or 1” equivalent. Calculate the image position. Lenses having focal lengths of 6, 8, 12, 16, 25, 35 and 50 mm are commonly available. Try it today! These equations use the focal length f of the lens, which is a characteristic of the lens and is usually expressed in millimeters. Master the focal length equation, understand EFL vs BFL, and calculate FOV instantly. But also the size of the sensor . For a shorter distance (closer object), the angle becomes smaller. This calculator determines the 35 mm equivalent (also called effective) focal length of a lens installed in a camera equipped with a smaller sensor. The same design was manufactured in different focal lengths, from For instance, let's calculate the altitude we need to achieve a GSD of 2 cm/px. Thin Lens Equation Calculator – Formula and Example This thin lens calculator tool helps find the focal length, image position, and magnification of an optical system involving thin lenses. Free lens calculator to easily determine focal length, field of view, and sensor size for your vision system. How can I determine the diameter of the image circle (i. Imaging optics solver: For a given object and image size requirement, this tool calculates the required focal length of the lens based on first order optics. This calculator follows the standard sign convention for the optical radius of curvature where if the vertex of a surface lies to the left of the center of curvature the radius of curvature is positive, and if the vertex lies to the right of the center of curvature the radius of curvature is negative. How to calculate image resolution The detail in an image is determined by resolution. We don't always care about precise This is an online calculator to find the focal length of a lens. By inputting any two variables, the calculator computes the third. What Is an Image Distance Calculator? An Image Distance Calculator is an online tool designed to compute the distance between the image and the lens based on two inputs: the focal length of the lens and the object distance (the distance between the object and the lens). For instance, let's calculate the altitude we need to achieve a GSD of 2 cm/px. Focal Length Required: This will calculate the focal length needed to observe the user entered FOV at the user working distance. Explore the Lens Calculator: a user-friendly tool for precise optical design. This calculator shows a ray diagram when the image is real. Sep 22, 2025 · Enter the distance of the object from the lens and the distance the image is formed from the lens to determine the Magnification. The distance between the object and the convex mirror is measured at the point where the image reflection reaches an approximate size of the object. If the object is placed inside the focal length, a "virtual image" appears in front of the This handy calculator shows, both with raw numbers and graphically, how to determine the best focus point to maximize sharp focus for any given scene. This calculator tool computes the Field of View seen by your camera and lens. Calculate image distance, magnification, and focal length for concave and convex lenses and mirrors. Lenses with shorter focal lengths typically have a shallower depth of field, while lenses with longer focal lengths have a deeper depth of field. Calculator Instructions Calculators already have sample data in them. Scientific Research If you’re conducting scientific research that involves spatial data, accuracy is paramount. 3) Distances measured normal to the optic axis are positive Solve lens and mirror problems with our online physics calculator. Learn how to calculate the magnification of a lens with our tool, using the lens magnification formula for precise results. 4 mm of aperture and 2,794 mm focal length at f/10. Calculate here. Focal length, the distance between a lens and its focus, significantly influences the magnification and field of view of images. It is simple math, but it will ABSOLUTELY require knowing accurate sensor size (both the pixel and mm dimensions) and focal length of your camera, which are all important to calculations, but which can be very difficult to determine for automatic cameras Mar 25, 2024 · Enter the distance of the object and the distance of the image into the calculator to determine the focal length. Lens Equation: The thin lens equation defines the relationship between the focal length of a lens, the distance of an object from that lens, and the distance of the image formed by the lens. Consider a drone with a sensor width of 13 cm fixed with a camera having a focal length of 10. Determine the object distance and tell whether the image is real or virtual. Magnification Calculator Calculate lens magnification ratios for macro photography based on focal length and subject distance. Calculate focal length, magnification, and other optical properties with this easy-to-use Optics Calculator. A Fixed Focal Length Lens, also known as a prime lens, is a lens with a fixed Angular Field of View (AFOV). Field of View is an angle which depends on the focal length and sensor size, but the calculator also computes dimensional Field of View sizes (width, height, or diagonal fields) at some specific distance, like at the subject distance, and another, like at a background distance. CARTESIAN CONVENTION: 1) Light initially propagates from left to right. Enter the focal length and press Calculate Focal length is the distance from the film to the pinhole Focal Length varies with zoom, and the Exif data with the image should report focal length (in coarse zoom steps, as best it can). Sep 21, 2024 · Calculating Focal Lengths in Optics 21 Sep 2024 Tags: Physics Optics Geometrical Optics Focal length calculation Popularity: ⭐⭐⭐ Focal Length Calculation This calculator provides the calculation of focal length for optics applications. Click HERE to download the tool in Open Office format. py tool and the Chessboard pattern PNG provided in the source code to generate a calibration matrix. The angle of view of course depends from the focal length. Frequently Asked Questions What is the Online Photo Composition Calculator? The Online Photo Composition Calculator helps photographers calculate essential values, like magnification, focal length, and angle of view, for achieving precise composition in their photos. Practice with different setups, become an expert in the sign conventions, and build a powerful, quantitative understanding of the principles that make all of optics possible. Focal length: Enter the optical focal length in millimeters. Just enter the object size, image size, and object distance to get the magnification, angle of view, and focal length value. This tool utilizes a straightforward formula, making it accessible for experts and hobbyists alike to understand the intricacies of lens focal lengths. Explanation Calculation Example: The focal length of a lens is a measure of its ability to focus light. Use this online convex mirror equation calculator to find the focal length, image and object distance. May 26, 2011 · If I took a picture of a windmill on the horizon — given that I know the sensor size and the focal length of the lens and other factors to do with the shot — could I calculate how far away an objec Image Distance of Convex Mirror formula is defined as the distance between the image and the mirror, which is a fundamental concept in optics, describing the relationship between the object and its virtual image formed by a convex mirror and is represented as vconvex = (uconvex*fconvex)/ (uconvex- (fconvex)) or Image Distance of Convex Mirror = (Object Distance of Convex Mirror*Focal Length of Learn what is focal length of lens with our interactive calculator. The crop factor calculator tells you the effective focal length and aperture f-stop of your camera in terms of standard 35mm lenses. This measurement helps in selecting the right lens for the desired photographic effect or for precision in scientific applications. Formulae used for these calculators Introduction Understanding how to calculate focal length is essential for professionals and enthusiasts in photography and optics. Sep 3, 2023 · Detailed Explanation of the Calculator’s Working The lens equation calculator simplifies the process of determining the relationship between the object distance (u), image distance (v), and focal length (f). These equations are fundamental in physics and optics, allowing you to determine the focal length, object distance, and image distance for lenses and mirrors. Calculate the Ground Sampling Distance (GSD) and the image footprint on the ground by inputting values for the: Sensor width (Sw), Focal length (Fr), Flight height (H), Image width (imW), Image height (imH) Click HERE to download the tool in Excel format. It is based on the lens formula, a standard equation in optics that relates these three quantities. Mar 6, 2025 · A: Focal length can affect the image quality by influencing factors such as depth of field, perspective distortion, and lens aberrations. Calculate focal length, field of view or working distance. Enter the object distant from the mirror and the image distance from the mirror into the calculator to determine the radius of curvature and focal length. FAQs: Concave Lens Calculator What is a Concave Lens Calculator? A Concave Lens Calculator is an online tool designed to compute key optical parameters related to concave (diverging) lenses. It will also calculate the magnification and field of view of the lens. Our lens maker equation calculator is a tool that helps to choose the appropriate parameters to obtain a specific focal length of the lens. Jul 3, 2025 · The Focal Length vs Sensor Size Calculator helps photographers and videographers determine how a lens will behave on different camera sensor sizes. Greater than about 90 most lenses start to show curved, barrel distorted images that compress the image at the edges. Calibrate the camera Use the OpenCV calibrate. In photography, microscopy, telescope optics, and other fields involving light or image focusing, it is essential to know how lenses interact. It helps users determine focal length, image distance, magnification, surface area, volume, and other relevant values based on user inputs. Object Distance of Convex Lens - (Measured in Meter) - The Object Distance of Convex Lens refers to the distance from the object being observed or illuminated to the convex lens itself. This is primarily intended to be used for fixed focal length lenses. Dec 26, 2012 · Focal-length (in mm and pixels per mm) Physical size of the image sensor (to calculate pixels per mm) I'm going to use focal-length since I don't want to google for the sensor datasheet. It is also used to design lenses with specific properties, such as wide-angle lenses or telephoto lenses. Find the perfect tool for your calculations at IM Calculator. This is an online calculator to find the focal length of a lens. Magnification The magnification m of an image is the ratio between the image and object height. 2) The origin of the Cartesian coordinate system is at the centre of the optical component. Width: Enter the width of the camera in pixels. We included three types of mirror formulae: Concave mirror equation Convex mirror equation Plane mirror equation Read on to find out what a mirror is, learn more about the lens mirror equations, and see some fun facts, such as how mirrors Instructions: This calculator may be used to calculate the image scale for a camera/scope combination. The calculator will evaluate the Effective Focal Length. If you want to hear more about the light 1. This calculator can be used to determine one of these variables when the other three are known. Using a common lens focal length, use Calculator #2 to determine the working distance necessary to get your desired field of view. Mar 25, 2025 · A: The focal length equation is used in lens design to determine the focal length of a lens that is required to produce a desired image size and location. Find the right lens quickly & easily with the Kowa lens calculator. Jul 5, 2025 · The Focal Width/Length Calculator is a practical tool used in photography, optics, and imaging systems to determine the actual width of a scene or subject that will appear in the frame at a given distance from the camera or lens. To calculate the working distance or altitude: Enter the camera's focal length as F = 10. Learn how focal length calculators use sensor size, object distance, and FOV to determine the ideal lens focal length for your imaging system. This helps users predict how much of a subject will fit into the frame, adjust composition, and select the right focal length for their needs. These equations use the focal length f of the lens, which is a characteristic of the lens and is usually expressed in millimeters. In this section, you need to fill in the Number of Horizontal Pixels, the Number of Vertical Pixels, the Pixel Size (μm) of the sensor, and the Lens EFL (effective focal length). Calculate Angle of View This calculator will give you the angle of view for each image format (Film and Video) Enter the focal length in millimeters in the column and click "Calculate". This calculator will help calculate the lens focal length based on the angle of view or magnification. The Zeiss Protar V, for instance, which is a usable lens nowadays, goes up to 110º. the diagonal size of CCD required to fully utilise a telescope's optics) at near-infinity focus? I have looked around online and found this Variables Used Focal Length of Lens - (Measured in Meter) - Focal Length of Lens is the distance between the lens's optical center and the image sensor, determining the lens's angle of view and the magnification of the image. Apr 21, 2025 · The Effective Focal Length Calculator helps users determine the actual focal length of a single lens or a system of lenses. Oct 25, 2025 · The Image Distance Calculator finds the position of the image formed by a lens or mirror based on the object distance and the focal length. In the calculator, just introduce your camera type (sensor size), aperture, focus distance, focal length (the real one! not the equivalent in 35mm) and teleconverter to calculate the depth of field: Hyperfocal distance: The closest distance at which a lens can be focused while keeping objects at infinity acceptably sharp. Perfect for photographers and enthusiasts who want to understand their camera lenses better and make informed decisions. Or, use Calculator #3 to determine the field of view resulting from a fixed working distance. The 'Focal Length Calculator' enables photographers to calculate the magnification of their lenses, ensuring the perfect shot. Obtaining Object Distance Feb 14, 2025 · The Focal Width/Length Calculator is a practical tool for determining the focal length of lenses or mirrors, critical in optics and photography. It then recommends a suitable lens structure and focal length based on the object field size. Perfect for photographers of all levels. The Focal Length Calculator is a versatile tool designed to help photographers and videographers determine the optimal focal length required to achieve a desired field of view at a specific distance. An easy to use calculator for lens magnification and depth of field in photography, together with an explanation of the theory behind it. About the Calculator This calculator helps you determine the focal length of your camera lens based on the photo scale, flight height, and point height. e. Enter the sensor size and if to calculate by angle of view or magnification. Easily calculate the focal length of a lens using our Lens Focal Length Calculator. Oct 9, 2022 · Our focal length calculator will help you figure out the focal length needed to capture a distant object through a thin lens. Calculate the properties of a thin lens using our Thin Lens Calculator. This tool shows you the effective focal length and field of view (FOV) when switching between camera bodies. Explanation Camera Calculation Example: This calculator determines the Oct 5, 2024 · An object is placed at a distance of 15 cm from a thin lens of focal length 10 cm. Astrophotography FormulaeFormulae for Astrophotography Calculators for AstrophotographyAstrophotography Formulae About Calculator Section – 1 This calculator is used to calculate the FOV (field of view) of an optical imaging system with given parameters. These calculators are widely used in optics, physics, and related fields to analyze the behavior of light rays passing through lenses. This feature can be used to play with various sensor sizes and focal distances to better understand how this equivalent works. Input object size, image size, and object distance, select your unit type for each, then click Calculate to get your focal length and angle of view. With this thin lens equation calculator, you can find the focal length of your lens. A plano-convex lens has a focal length of 25 cm. Ideal for students, teachers, and physics enthusiasts. 62 mm. Over-sampled images look rather nice because the stars are round with smooth edges but if you have more pixels than are necessary why not use a reducer to reduce the telescope’s effective focal length, which makes the image brighter and enables you to fit more sky on your sensor. For large numbers, do not use commas. Mar 2, 2025 · Scene-to-Image Parameter Calculator 02 Mar 2025 Tags: Computer Vision Camera Geometry Camera Models Camera Calibration Popularity: ⭐⭐⭐ Camera Parameter Calculation This calculator helps determine camera parameters (pixel dimensions and focal length) based on scene size, desired pixel density, and field of view. Purpose: Assists in optics studies and applications like telescope design or medical imaging. This calculator determines the focal length required to image a target at a specified field of view and working distance. Image properties The focal length, \ (f\) of a lens can described using the distance of the object to the lens, \ (S_1\) and the distance of the lens to the image, \ (S_2\): $$ \frac {1} {f} = \frac {1} {S_1} + \frac {1} {S_2} $$ An object must be placed at \ (S_1 \gt f\) for a sharp projected image. A distance to image calculator can enhance your campaigns by ensuring that your graphics and images align perfectly with the intended delivery for maximum impact. Rectilinear lenses such as those using Theia Technologies’ Linear Optical TechnologyTM don’t exhibit barrel distortion and Apr 29, 2024 · If it is too large, the image blurs; if it is too small, the image dims and loses detail. Sep 22, 2022 · Depending on which crop you use for Clear Image Zoom, will dictate the closet focal length your video or photo is now at. Focal Length Calculator With this tool you can calculate the required focal length to take a picture of an object at a given distance in order to generate an image fitting on your sensor size. The total field of view of the camera is then derived using this image scale. It is a good starting point for solving finite conjugate problems. 2. Convert Angle of View and Focal Length The angle of view indicates the image size in degrees, when the objective is set to ∞. Calculate focal length instantly: solve math problems, upload images of equations, and generate graphs – all in one tool. 0 cm. Note this calculates for a plane parallel to the camera image plane. jmpl izzwds htjdx sizka xmzaxx wvhvue xre nxxk bcocm gctiqy bice ezpbx rccio dehn cjnora