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[OM] Telecentric lenses + close ups

Subject: [OM] Telecentric lenses + close ups
From: Tim Hughes <timhughes@xxxxxxxx>
Date: Thu, 8 Apr 2004 00:05:45 -0700 (PDT)
There has been a lot of discussion on Olympus's telecentric Digi-lens designs, 
for digital use, to improve drop off of light at corners of digital imagers.
 
Here is an interesting reference on using TC lenses the other way round, to 
eliminate perspective distortion in close-up applications for metrology. These 
lenses can measure linear dimensions correctly at different (close-up) 
distances from the lens and they could reduce big nose effects in extreme 
portrait closeups! See picture comparison:
http://www.edmundoptics.com/TechSupport/DisplayArticle.cfm?articleid=239
 
Flatbed Scanners should do this inherently, at least in one dimension, as long 
as the depth of field is adequete.
 
Regards,
Tim Hughes


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