Lens length confusion

Started Jan 14, 2013 | Questions thread
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Contributing MemberPosts: 565
Re: Good explanation Leonard, as usual
In reply to Leonard Migliore, Jan 16, 2013

We have mostly been discussing lenses that are telecentric in image space (the world between the lens and the sensor). One typically has a lens telecentric in image space because you want the light to have normal incidence on the sensor; one of the concepts in the 4/3 system was having such telecentricity to eliminate loss of sensitivity in the corners due to the loss of efficiency with angle of incidence that is characteristic of image sensors."

So where do they put the aperture stop in a 4/3 system and why just a 4/3 system?  Is it because you have smaller diameter lenses to work with?

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