Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  Extremely wide field
Sigma 50mm 1.4 EX DG Canon Adapter on A7II with Tripod (2sec ISO800 f1.4), Ghostcrawler
Sigma 50mm 1.4 EX DG Canon Adapter on A7II with Tripod (2sec ISO800 f1.4)
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Sigma 50mm 1.4 EX DG Canon Adapter on A7II with Tripod (2sec ISO800 f1.4)

Sigma 50mm 1.4 EX DG Canon Adapter on A7II with Tripod (2sec ISO800 f1.4), Ghostcrawler
Sigma 50mm 1.4 EX DG Canon Adapter on A7II with Tripod (2sec ISO800 f1.4)
Powered byPixInsight

Sigma 50mm 1.4 EX DG Canon Adapter on A7II with Tripod (2sec ISO800 f1.4)

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Description

Dear all,

I did a lens test on a tripod just straight out of my window to get an idea of the lens performance for winter time. I think it looks quite good but corners are only angel like. Stopping down to 2.8 solves that issue. See for that also my addtional 2.8 upload. Other stops between 1.4 and 2.8 do not really have an positive effect. It is only one single shot, so no stacking. I had to reduce the resolution from 72pix/inch to 50pix/inch due to file zise. I did the following things for development:

Pixinsight:
Automatic Background Extractor
Background Neutralization
Colour Calibration
SCNR Green 100 % remoove
Stretch
Curves Transformation

I hope that might help someone of you if you are looking for narrower fild.

Yours Philipp

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Sigma 50mm 1.4 EX DG Canon Adapter on A7II with Tripod (2sec ISO800 f1.4), Ghostcrawler