Astronomical ISO test (lots of comments!)

Started Jan 29, 2013 | Discussions thread
just Tony
Contributing MemberPosts: 514
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Does that CA clean up much at f/5.6?
In reply to Trollmann, Feb 6, 2013

I wish I had star-tested the Zeiss 100 when I rented it.

I can report that I have found absolutely zero longitudinal CA with either the Nikon 85/1.4G or the Nikon 105/2 DC, along with essentially zero suspicion of it at f/4 either. Those two lenses are corner to corner pinpoint (microscopic pinpoints at that) on fullframe at f/5.6 but there is slight bloating in the corners at f/4. It always seems to end up being f/5.6 for me in order to get full-frame perfection on stars.

The upcoming Zeiss 135 has me hoping for a nearly perfect f/4.

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