Is this astigmatism? Sigma 30mm F1.4 EX DC

Started 5 months ago | Discussions thread
fvdbergh2501 Regular Member • Posts: 423
Another experiment to expose coma

QuietOC wrote:

How about capturing an image of a computer monitor displaying a sparse grid pattern?

Something like this:

Display it at 1:1 on a monitor, then try to focus the lens as well as possible. It would help to darken the room to minimize stray light.

I have done this a few years ago, and came away horrified at the obvious coma in my Nikkor 18-55 mm kit lens


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