hiepphotog wrote:
I'm curious. The center of this image should be out of focus if this is without any crop. The severe field curvature on these Biogons would prevent this kind of shot possible, unless you do a DOF stack.
That's what I would have expected, but it doesn't seem to be what happens in practice. I don't understand how it works. I'd provide some 100% crops, but the issue is confounded with star trailing as the exposure was too long. When I get the chance, I'll try to get a starscape that doesn't suffer from trailing.