All dimensional values are in millimeters.

First enter your application parameters in Calculator #1. This will help you determine the ideal lens magnification.

You're not likely to find a lens having the exact magnification suggested by Calculator #1. Typically, you'll want to select the first available lens having a lower magnification. This will result in a slightly larger field of view.

You can use Calculator #2 to determine the field of view provided by a lens having a particular magnification.

When imaging objects larger than the camera's sensor, choosing a large sensor will increase the necessary magnification. This typically results in a more compact lens that costs less. Plus, larger sensor pixels usually require less light and enables superior image contrast.

If you enter an area-of-interest ("AOI") smaller than the full sensor size, the calculator will assume the AOI is centered on the sensor, and that vignetting is acceptable outside the AOI. This sometimes enables selection of a lens having more magnification, resulting in a more compact and lower cost lens.

Calculators assume field of view width is in direction of the camera sensor's width. If your field of view's height is greater than it's width, consider rotating the camera 90 degress.

For a line scan camera, enter a vertical pixel resolution of 1 to 3 pixels. You may then enter a vertical field of view of zero.

There are many other factors to consider beyond lens magnification. Learn about telecentric lenses. We'd be glad to help you select a lens appropriate for your project.