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Old 10-08-2019, 12:27 PM
Merckx (James)
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Jaensch stockyard

Camera: Sony A57
Lens: Sigma 35mm f/1.4
Composition: 21 frame mosaic
Total exposure: ~60 minutes-cm2 (17x sky 60s f/2 ISO400, 4x land f/1.4 180s ISO400)
Tracker: Sky-Watcher Star Adventurer
Raw converter: RawTherapee
Processing: Hugin, rnc-color-stretch, GIMP
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Last edited by Merckx; 10-08-2019 at 03:47 PM. Reason: correct maths for total frames in the mosaic
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Old 10-08-2019, 12:45 PM
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gregbradley
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I really like this one. Great colours in the M Way and good framing.

Is this a single stack of 17 images or 17 individual images formed into a panorama?

I have that lens as well. Its very fast and lets in a lot of light but the corners are usually pretty poor.
Its also quite an unstable lens on a Sony camera electronically.

Greg.
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Old 10-08-2019, 03:46 PM
Merckx (James)
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Hi Greg, thanks for your kind words.

I think this my best nightscape yet as I climb the learning curve juggling polar alignment, tracking, focussing, camera settings and processing. So many things to get wrong!

The image is 21 individual images formed into a panorama (17 tracked for the sky and 4 stationary for the land). (oops - need to fix the orignal post!).

Regarding the Sigma 35mm, I've had it about 3 months and used it almost exclusively for nightscapes (night-time, manual focus etc). I haven't noticed any instability with my A57 or A65. Agree the corners aren't perfect but they're a lot better than the other lenses I've used for nightscapes. In any case down scaling from a large panorama can hide many sins!

James
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