Focal length finderlenses

The focusing power of a lens and its focal length is inversely proportional. A lens with a longer focal length, when compared to a lens with a shorter focal length, will result in a smaller field of view and increased magnification of objects. The field of view can be expressed as a dimension in millimeters or degrees. When the sensor size (H), desired field of view (FOV), and working distance (WD) are known, it is possible to estimate the required focal length (f) of the lens using the following equation.

Focalratio calculator

You can save development effort and reduce product costs with an optical module. Optical modules include a high-performance image sensor module paired with an ideally matched lens and lens mount, which provides easy compatibility with your choice of image processing board via FRAMOS’s standardized PixelMate™ interface.

By utilizing this focal length calculator tool, you can determine the focal length needed to capture an image of an object at a specified distance. This calculation allows you to ensure that desired field of view will be captured by your optical module.

It should be noted that as the field of view widens, the resulting image may exhibit more distortion. In certain cases, distortion can be mitigated using dewarping techniques. However, it is advisable to select a lens optimized for the intended field of view to minimize distortion in the original image.

How to calculatefocal lengthof convex lens

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By measuring the object distance (u) and the corresponding image distance (v), you can substitute these values into the lens formula and find the focal length (f). It’s important to know that the focal length of photographic lenses is usually expressed in millimeters (mm).

Focal lengthto magnification calculator

Determine the best optical fit for your project based on the required sensor size and image circle, desired operating range and field of view (FOV), and lens type requirements specific to your application.

Keep in mind that this formula assumes thin lenses and a paraxial approximation, which are valid for many practical situations. However, for complex optical systems or special lenses, additional considerations and corrections may be required for accurate calculations.

The angular field of view (AFOV), which represents the extent of the observable scene in degrees, can be derived from the field of view (FOV) and working distance (WD).