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Measuring with telecentric lenses

Measuring with telecentric lenses

Measuring with telecentric lenses

(OP)
If I measure a flat object using a lens, projecting onto a flat CCD, is there any value to using a telecentric lens? Or will a high quality enlarging lens, etc. do just as well?
 

RE: Measuring with telecentric lenses

I think that as long as your object and CCD are not tilted with respect to the lens a high quality non-telecentric lens will work just as well.  

RE: Measuring with telecentric lenses

The main advantage of a telecentric lens:
> Object size is nearly constant for changes in object distance -- If you are making measurements, this might be a big issue.  You can compensate by always having measurement reference in the image, but that might not always be possible.

> Depth of focus is larger, so refocusing for object distance changing is minimized

 

TTFN

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