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Forum: Pentax SLR Lens Discussion
05-14-2010, 08:50 AM
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It depends on the lens and if it's reversed.
If you used your M50/1.7 reversed on a Bellows @ 2:1 magnification (Bellows extension 80mm), your film plane to subject distance would be 230mm.
Phil.
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Forum: Pentax SLR Lens Discussion
05-12-2010, 09:14 PM
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Because of the location of the optical nodes in the K28/3.5, it is one of the best lenses available for reversing, examples:
Reversed will give you 1.9:1 magnification.
Reversed with Auto Extension Tube #1 will give you 2.32:1 magnification.
Reversed with Auto Extension Tube #2 will give you 2.56:1 magnification.
Reversed with Auto Extension Tube #3 will give you 2.81:1 magnification.
Reversed with Auto Extension Tube #1+2+3 will give you 3.90:1 magnification.
Reversed with Bellows K extension at 32mm will give you 3.02:1 magnification.
Reversed with Bellows K extension at 137mm will give you 6.72:1 magnification.
For the last listing the film plane to subject distance is 280.5mm.
Phil.
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