Listing Parafocal lenses for A-mount

Started Apr 17, 2012 | Discussions thread
Keith Hanlan
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Re: Listing Parafocal lenses for A-mount
In reply to Maxxuman, May 2, 2012

Maxxuman wrote:

I wonder if it's easier to make a fixed aperture lens (like the beercan) parfocal than one on which the minimum aperture varies while zooming?

I think it would make it harder as the ability to stay wide open at all focal lengths is an additional constraint on the design.

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