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Forum: Pentax SLR Lens Discussion 02-11-2010, 05:36 AM  
Reversed lens image circle?
Posted By newarts
Replies: 3
Views: 3,047
I ask this in anticipation of using a reversed lens in a tilt-shift application. I'll take a suitable lens longer than about 60mm and reverse it to move it farther from the sensor.

For example, the front focal point for a 100mm lens lies somewhere around 100mm from the front of the lens. This is more than enough distance to accommodate tilting the lens with respect to the optic axis. but is the image circle at that focal distance the same as it would be if the lens were mounted normally?

Would a full frame lens have the same sized image circle when used in reverse? Like I reverse a 100mm lens and mount it such that the focal point for the reversed lens falls on the sensor; the entrance and exit pupils have been swapped. Does the image circle stay the same or does it change according to some rule?


Dave in Iowa
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