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FORUMS Photography Talk by Genre Astronomy & Celestial Talk
Thread started 18 Sep 2017 (Monday) 17:26
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Shooting astro with Sigma's 35mm?

 
kaitlyn2004
Goldmember
1,554 posts
Joined Oct 2009
Sep 18, 2017 17:26 |  #1

I don't do really do any astro, but I am going on a trip where I have good options to shoot beautiful astrophotography. My lens options are my 16-35 F4L IS or Sigma 35 1.4 Art.

I think the Sigma is the obvious choice for light, but horrible for focal length. I've heard of people shooting panoramas for astro, but having some difficulty wrapping my head around this.

How many shots would I need to take to get the equivalent focal length of shooting my scene at 20/24mm?

And HOW does the pano actually work? Unless you have a super strong foreground, I imagine stitching is very difficult - but on top of that, the sky (stars) are MOVING. So how does the pano stitching work?

Anyone shoot astro with the 35? Any thoughts?


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imsellingmyfoot
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Joined Apr 2011
Dallas, TX
Sep 19, 2017 17:53 |  #2

I agree with you, the Sigma is the obvious choice for light, but horrible for focal length.

I have it and have shot astro stuff with it. It performs very well optically for astro stuff: good sharpness, especially around f/2, not much coma in the corners, and it doesn't vignette very much. I do wish that it was wider and that my 24 Art had the same performance as it for astro stuff. I was out at Caprock Canyons State Park in Texas, USA a few months ago and took the three images below with my 35. Composition is nothing special because I was still enamored with how many stars I could see. I later switched to my 24 and wished I could have gone even wider. The shots below should be able to give you an idea about what it can do.

I have no experience with astro panos or stacking, so I can't chime in there. If you'd like, I can link to some images with my 24, just so you can see the difference.

IMAGE: https://farm5.staticflickr.com/4418/36521212563_c90cb2ba65_c.jpg
[IMAGE'S LINK: https://flic.kr/p/XDfL​7F] (external link)20170721-IMG_6985.jpg (external link) by the.bengineer (external link), on Flickr

IMAGE: https://farm5.staticflickr.com/4295/35280799514_c87f14c461_c.jpg
[IMAGE'S LINK: https://flic.kr/p/VKDj​wN] (external link)20170721-IMG_6979.jpg (external link) by the.bengineer (external link), on Flickr

IMAGE: https://farm5.staticflickr.com/4318/35280798794_a7489f874a_c.jpg
[IMAGE'S LINK: https://flic.kr/p/VKDj​jo] (external link)20170721-IMG_6978.jpg (external link) by the.bengineer (external link), on Flickr

Canon 6D | Sigma 24A | Sigma 35A | Canon 50 f/1.8 | Canon 70-200 f/4
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MalVeauX
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Joined Feb 2013
Florida
Post has been edited 29 days ago by MalVeauX.
Sep 19, 2017 18:12 |  #3

It works fine if you just focus on specific parts of the galactic core, which is available this time of year. If you're just shooting the core where all the interesting stuff is, you're good. If you're trying to get the whole shebang, you will need to do a pano. I don't recommend you try to just do panos all night unless you're already experienced with it. Just focus on simple good exposures of the core and enjoy learning to process it and getting something out of it.

In your place, if shooting mikly way, I'd opt to try your 16-35 over just the 35A. F1.4 sounds great, but you don't need that. You'd be fine shooting at 20mm F4 for 30 seconds at ISO 6400, give or take. I'm not sure how the coma control is on that lens, but I'd go that route before worrying about a 35mm just because it has F1.4.

Then again, a simple tracker would relieve you of many problems and is way cheaper than a lens.

++++++++

Example:

Cheap Rebel (650D) (remember APS-C for effective focal length here)
35mm F2 IS & 85mm F1.8
Cheap tracker (iOptron Skytracker)

IMAGE: https://farm8.staticflickr.com/7429/14076981462_358901f129_z.jpg
[IMAGE'S LINK: https://flic.kr/p/nrWd​9W] (external link)20140501_053133 (external link) by Martin Wise (external link), on Flickr

I can get:

(35mm) 4 minutes at ISO 400 wide open at F2, this is a single exposure:

IMAGE: https://farm8.staticflickr.com/7449/13031601445_3deeea5d13_z.jpg
[IMAGE'S LINK: https://flic.kr/p/kRyn​6x] (external link)DPP_0794 (external link) by Martin Wise (external link), on Flickr

(85mm) 2 minutes at ISO at ISO 400 at F2, this is a single exposure of same region:

IMAGE: https://farm4.staticflickr.com/3174/13007268865_d6752f32be_z.jpg
[IMAGE'S LINK: https://flic.kr/p/kPpD​Si] (external link)DPP_0782 (external link) by Martin Wise (external link), on Flickr

These days, I'd suggest a SkyWatcher Star Adventurer ($300). Use any focal length of 200mm or less and it's still very easy to get 2~4 minute exposures. Nothing wrong with 35mm on any sensor size. It's all about what you're wanting to actually see.

Very best,

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Shooting astro with Sigma's 35mm?
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