[pure-silver] Re: History... Clarification

Ray Rogers wrote:
Were any of these non-circular-ish apertures found on
common (pictorial) lenses?

No. They were Waterhouse stops found in process lenses.

Interesting...

Are there any other unique features or properties to process lenses?

They tend to be dialites, 4 elements 4 groups. They tend to have longer
focal lengths and not have super big apertures; i.e., f/9 is kind-of usual.
They are usually optimized for 1:1 reproduction ratio


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