Wavelength.......................... | λ | |
Lens pitch............................. | PA | |
A2 focal length...................... | fA2 | |
Lens FL focal length.............. | fL | |
Flat Top size........................ | DFT | |
Fresnel Number.................... | FN |
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FN < 1 | - severe diffraction effects | |
1 < FN < 5 | - diffraction effects | |
5 < FN < 20 | - acceptable | |
FN > 20 | - excellent |