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That's a very nice shot but would you share your thinking about why you stopped the lens down to f8?
The Samyang 135mm f2 is very sharp at f2. Stopping down to f2.8 or f4 it quickly becomes quite superb to the corners even with a full frame sensor and certainly with an APSc sensor. I have only ever stopped it down to f 5.6 once when I deliberately wanted to extend the exposure time to 4 mins to test the tracking accuracy of a small SW Star Adventurer tracker.
The main problem with that lens using full frame is vignetting where flats would help. The cut is very hard on full frame and on APSc it is far less of a problem.
cheers
Joe
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