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Hi Hugh,
I have only had a chance to snap a couple of night pics in my back yard, in the moderately light polluted suburb of Burwood East, Melbourne. I took these on the 19th Feb, 10:45pm, f2.8, 8 secs, ISO 1600.
I have not yet tried lens correction data.
I am fairly impressed with the sharpness (considering its a $400 lens) and you certainly need to accept and work with the distortion. The lens does not talk to the camera in terms of adding metadata for the f stop to your picture, and when shooting something closer than a few meters you need to use live view and magnify the image 10x to get sharp focus. Also when ISO was set to auto the camera never changed it from 100.
For good results during the day I set the camera on aperture priority (so camera chooses shutter speed) and manually set the ISO somewhere under 1000 and use something around f8. The build quality is no where near a Japanese lens, but it feels adequate.
Pics (no processing): full image, 100% crops (centre, top-left, bottom-right).
Rgs Tim.
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