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Hi Lars,
I was refering to the apparent aperature blades in your photo's.
You said all those shots were at f4.
At f4 you should not get this at all.
With regard to the tilt, I bought this lens 6 or 7 years ago.
I got bored with trying to eliminate the tilt with my 645 to EOS and NEX (Sony) adaptors so I have used it exclusively for terrestrial photography ever since.
I may have to revisit astro again with it one day.
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