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Old 21-07-2020, 10:56 AM
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astronobob (Bob)
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20mm Wide on Milkyway

Had beautiful clear, dry Bortle 2'ish skies '14th Jul' Rathdowney SEQld.
Canon 6D II, Star-Tracker, Sigma 20mm Art.
15 x 30sec, F2, ISO2500

1.3Mb - https://imgur.com/AwzmMzc
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Old 21-07-2020, 11:42 AM
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That's a terrific shot Bob.

Do you get much coma in the corners of the 20mm Art? The 28 Art gets good reviews but I would prefer 20mm as its a good wide focal length for this type of shot.

Greg.
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Old 21-07-2020, 12:03 PM
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astronobob (Bob)
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Quote:
Originally Posted by gregbradley View Post
That's a terrific shot Bob.

Do you get much coma in the corners of the 20mm Art? The 28 Art gets good reviews but I would prefer 20mm as its a good wide focal length for this type of shot.

Greg.
Thnx & Certainly do Greg, I always crop off some but here is pixel crop from the whole single frame, top left corner..
Hope gives an idea of corners I get - not too shabby all considering the width of view.
I do find these Art Lens's are much better at controlling coma and particularly color fringing than the Canons range, by a long shot actually, i will never buy another Canon lens for astro unless they correct the issues..
Rgrds
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Old 21-07-2020, 02:48 PM
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Quote:
Originally Posted by astronobob View Post
Thnx & Certainly do Greg, I always crop off some but here is pixel crop from the whole single frame, top left corner..
Hope gives an idea of corners I get - not too shabby all considering the width of view.
I do find these Art Lens's are much better at controlling coma and particularly color fringing than the Canons range, by a long shot actually, i will never buy another Canon lens for astro unless they correct the issues..
Rgrds
Thanks Bob. Yes that is similar to my 14mm Art 1.8.

One trick is to compromise focus between the centre where these lenses are extremely sharp and the corners. You can get the corners almost round. Then you can apply a bit of distortion correction in Lightroom to further improve it.

Greg.
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Old 21-07-2020, 03:29 PM
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multiweb (Marc)
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Terrific shot Rob. If I had skies like that I'd probably die of sleep deprivation.
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Old 21-07-2020, 10:51 PM
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Terrific shot Rob. If I had skies like that I'd probably die of sleep deprivation.
Cheers Marc - naah you catch up when the clouuuuds roll in
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Old 22-07-2020, 07:52 AM
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Ryderscope (Rodney)
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Beautiful Bob. A fantastic wide field shot.
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Old 22-07-2020, 09:20 AM
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Nice wide field Bob. Perhaps a bit blue on the sky though. Otherwise excellent looking.
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Old 22-07-2020, 07:39 PM
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astronobob (Bob)
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Thanx for them kindly words Rodney & Paul, also concerning your color input, good value taken onboard.
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Old 25-07-2020, 01:58 PM
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Wow Bob what an expanse..."how good is our Galaxy!?" (Scomo)

Mike
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