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05-28-2011, 03:59 PM   #46
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Beyond telecentric



Did forget how I did this, but an easy way to get something telecentric, is reversing a 50/1.7 before a short tele (90..135mm) lens.

05-29-2011, 12:28 AM   #47
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http://www.lhup.edu/~dsimanek/scenario/labman3/telecen.htm

This is a link that shows the theory for a telecentric lens on both image and object side.

You really need that stop in between the front and back lens and it has to be the right size and the right distance between the two lenses to make the lens truly telecentric.

At that point you would have a chance of capturing a sharp focus stack all the way through an object of 2 - 3 centimetres.

Last edited by waxsage; 05-29-2011 at 12:30 AM. Reason: misread last post!
05-29-2011, 12:01 PM   #48
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Luckily, for people like myself that are not currently up to building a telecentric lens system, photoshop takes care of the distortions in layer stack. So not all is lost... This is a result with 6 layers, once more with the reversed 80mm Rodenstock enlarger lens at f/5.6...


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