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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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