Is lens testing at chart distance really an accurate measure?

Started 2 months ago | Discussions thread
AiryDiscus Senior Member • Posts: 2,160
Re: Is lens testing at chart distance really an accurate measure?
1

Erik Kaffehr wrote:

Looking at the same lenses at 1.2 m, a different picture arises:

Here the Zeiss CF 3.5/100 has astigmatism while the 2.2/100 HC maintains sharpness.

That's definitely third order coma.  It's field linear and astigmatism is quadratic.

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