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Old 12-04-2012, 05:58 PM
skysurfer's Avatar
Dark sky rules !

skysurfer is offline
Join Date: Dec 2011
Location: 52N 6E (EU)
Posts: 1,040
This lens should have an exceptional quality. Virtually no (rectilinear) distortion at 12mm (unlinke other 16mm wideangles), but there is vignetting.
I have a Sigma 10-20 on a Canon 7d which makes excellent wide field sky pics.
Only one catch: as these wide angles are rectilinear, distortion can be a problem with astrophotos even when rectilinear distortion is low.
I made for example this image with the 10-20 @ 10 (equivalent with 16mm on FF):

At 12mm distortion can be even worse than 16mm.
Maybe a fisheye suits better if this distortion is a problem.

On the edges the constellations look larger.

Test reports on the 12-24:
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