Best answer by DavidView original
Measure focal length of a lens
I am using a Zemax model of an Edmund Optics lens in my design. The lens has a focal point of 10mm at 587.6nm, but my instrument will use a 650nm laser. Is there a tool in Zemax that calculates the focal length of a lens, with consideration of wavelength? Alternatively, I would appreciate guidance on how to calculate this by hand. The best I have been able to do so far is eyeball the location where the light converges and measure that distance (which appears so be about 12.3 mm).
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"Effective focal length in the local x or y plane of the range of surfaces defined by Surf1 and Surf2 at the primary wavelength."
This is useful if you just want the focal length of a contiguous part of a lens design but you are limited to the primary wavelength. For symmetrical systems x and y are the same.