Slide Projector Calculator
Focal length (F1) of lens (L1) [mm]:
Distance between the slide and lens "L1" [mm]:
enter "8" if the film is attached directly to the lens mount
The thin lens formula applied to calculate the distance between L1
and the intermediate image it forms:
The same formula is applied to calculate the final image,
where the "object" is the intermediate image
whose parameters are shown in the yellow boxes below.
Distance between the intermediate image and L1 (di1):
Magnification of the intermediate image formed by L1:
Focal length (F2) of lens (L2) [mm]:
Distance between L1 and L2 [mm]:
Distance of the final image from L2 (di2):
place the screen at this exact distance from "L2" to obtain a clear image
Final image magnification relative to the object (O):
