Help judging performance of my FE55z, FE35f2.8z horizon/infinity

Started Jul 5, 2016 | Questions thread
JimKasson
JimKasson Forum Pro • Posts: 26,554
Re: Help judging performance of my FE55z, FE35f2.8z horizon/infinity

Nephi wrote:

JimKasson wrote:

I've got a copy that has been fine. I can take a hard look at it.

Perfect. This will be a good test because you've tested it and did not see decentering. In my experience the best way to see the decentering is to take a level infinity test with somewhat equal detail on each far side (i.e. same trees, or similar structures). Obviously a test shot at 2.8 is the best way to see the issue. Though to be clear, stopping down does not seem to help much.

You have Imatest. Is there not a way to put up a test chart and measure sharpness left to right? I would think that would be the ideal approach. You'd be the guy I'd trust to get the test right.

I'm anxious to see what you find.

I'll get to more exhaustive, more time consuming testing, but here's the OOF LED:

I've seen better. Looking at the lens when it's wide open, I can see the problem; the blades on one side are not fully retracting. That shouldn't affect normal photography.

Jim

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