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20mm 1.8G or 24mm 1.4GM for Astrophotography

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QuietOC View Drop Down
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Post Options Post Options   Quote QuietOC Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2020 at 18:17
I tested my ultra-wides on stars last night with the A7III. The sky here is crazy bright from light pollution, and the super moon was rising. I tried the bright monitoring feature, only to find it only works full-screen, so not particularly useful. An external 1080p monitor would have been helpful.

The Tamron 20mm F2.8 Di III OSD does very well wide-open. The Samyang 18mm F2.8 has more coma, but less than the other lenses. Overall performance with stars was similar to their performance with a test chart. The biggest surprise was the Sigma 20mm F1.8 did surprising well.

The focus distance displayed on the camera was finite for every lens when the stars looked sharpest. It was nearly impossible to see any stars in the live-view with the Sigma 12-24 F4.5-5.6.
Sony A7III A77II A6000 HVL-F45RM LA-EA3 LA-EA4 MB-IV MC-11 EF-E II MD-NEX KR-NEX DA-NEX
Minolta Maxxum 600si
Pentax Q7 5-15 15-45/2.8 8.5/1.9 11.5/9 AF-P/Q
 



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jkkyler View Drop Down
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Post Options Post Options   Quote jkkyler Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2020 at 13:51
Update: So I received my 70-200 f/4 G lens and am very pleased. Didn't have quite the reach I recalled my big beercan having but then I realized that is because I was using it on an aps-c (SLT-A55) before but with aps-c mode the reach was there. very sharp lens, no complaints.

The Sony 20mm f/1.8 however is a different story. I could have ordered it from BH and received a 10% discount ($89) and had it it two days or gotten it from Adorama or other e-tailer but I decided to support the local camera shop as I Am sure they needed the business with COVID19 really taking a toll (even though the owner is a bit of a jerk). I went in two weeks ago and they didn't have it in stock so they ordered it and said it would be in most likely on Wed (ordered on Sat). 2 weeks later and I still don't have the lens. THey just assumed it was in stock from their supplier and never bothered to check ; turns out it is backordered with their supplier and will likely be another two weeks before I get it which pisses me of since I planned on an astro shoot with it this coming week when there is no moon.
"never let a good deed go unpunished"
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Hezu View Drop Down
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Post Options Post Options   Quote Hezu Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2020 at 14:58
Originally posted by jkkyler jkkyler wrote:

The Sony 20mm f/1.8 however is a different story. I could have ordered it from BH and received a 10% discount ($89) and had it it two days or gotten it from Adorama or other e-tailer but I decided to support the local camera shop as I Am sure they needed the business with COVID19 really taking a toll (even though the owner is a bit of a jerk). I went in two weeks ago and they didn't have it in stock so they ordered it and said it would be in most likely on Wed (ordered on Sat). 2 weeks later and I still don't have the lens. THey just assumed it was in stock from their supplier and never bothered to check ; turns out it is backordered with their supplier and will likely be another two weeks before I get it which pisses me of since I planned on an astro shoot with it this coming week when there is no moon.
"never let a good deed go unpunished"
Perhaps you have to now get also FE 1.4/24 and order it from a store that actually has it in stock...
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Post Options Post Options   Quote jkkyler Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2020 at 16:31
Originally posted by Hezu Hezu wrote:

Originally posted by jkkyler jkkyler wrote:

The Sony 20mm f/1.8 however is a different story. I could have ordered it from BH and received a 10% discount ($89) and had it it two days or gotten it from Adorama or other e-tailer but I decided to support the local camera shop as I Am sure they needed the business with COVID19 really taking a toll (even though the owner is a bit of a jerk). I went in two weeks ago and they didn't have it in stock so they ordered it and said it would be in most likely on Wed (ordered on Sat). 2 weeks later and I still don't have the lens. THey just assumed it was in stock from their supplier and never bothered to check ; turns out it is backordered with their supplier and will likely be another two weeks before I get it which pisses me of since I planned on an astro shoot with it this coming week when there is no moon.
"never let a good deed go unpunished"
Perhaps you have to now get also FE 1.4/24 and order it from a store that actually has it in stock...

That thought had seriously crossed my mind but pretty sure the wife would not have it. 2 lenses and also ordered a speedlite and accessories this month is about as far as I can push it.

Couple sample shots from the park with the 70-200 f/4
JKK05580.jpg
JKK05574.jpg
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nandbytes View Drop Down
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2020 at 19:13
can't you cancel the 20G order and order it from some place else or order the 24GM.
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jkkyler View Drop Down
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Post Options Post Options   Quote jkkyler Quote  Post ReplyReply Direct Link To This Post Posted: 23 May 2020 at 21:34
Unfortunately not 'special order" - no refund exchange only and the owner is a jerk but I really wanted to help out the staff and employees who are hurting. I will get it eventually. WIll just use the 14mm 2.8 rokinon and maybe even try the zeiss 16-35 wide or nearly wide open and f/4.0 but bump the iso a couple stops normally I shoot around 1600-3200 but the A7iii is supposedly iso invariant from 100-500 then from 640-512,000 so Shooting at 6400 or a stop higher may work on that f4 - not for publishable or blow ups but for 4x6/8x12 or desktop viewing
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Tricky01 View Drop Down
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Post Options Post Options   Quote Tricky01 Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2020 at 10:42
Originally posted by Hezu Hezu wrote:

[QUOTE=horizon]Another lens often suggested for astrophotography seems to be Sigma 14 mm F1.8 Art. Its biggest con is of course that it is big and heavy.

Of course, this easily boils down to what sort of field of view you would like for your astrophotos.

I bought the Sigma 14mm f1.8 for astro and indeed it is HUGE and heavy. It's a lovely lens and this is the kind of field of view I like for milky way and star trails. But I replaced it with the Laowa 15mm f2 for several reasons.

1. Image quality - I couldn't discern any differences in image quality
2. Size - It's a fraction of the size of the Sigma - the sigma is a DSLR lens that they've added an extra 2-3cm length to so that it can be used on FE mount cameras. The Laowa is similar size to the Sony 35 and 85 1.8 FE, whereas the Sigma is bigger than the Sony 135 1.8. So I can carry two lens (Laowa plus either 35 or 85) for the space that the Sigma takes up in the bag
3. Auto focus - for astro you simply don't need it so why pay extra for something you won't use
4. Filters - doesn't quite apply to Astro, but the ability to put a big ND filter on it and use it for long exposures was attractive (still haven't done it though and would probably use the 16-35 f4 for this kind of thing)

So even if price was the same between these two, I'd got for the laowa, but when Laowa is half the price, it's a no brainer. The ONLY worthwhile benefit of the Sigma to the Laowa for me would be the EXIF info. I'm a bit of a data nerd, so I quite like knowing the aperture I've set, but not enough to outweigh the points above.
A7iii, 15f2, 16-35f4, 24-105G, 35f1.8, 85f1.8, 135f1.8GM, 100-400GM, 1.4xTC // A mount: Sig180 3.5 Macro, Gitzo Traveller, Flashes+PixelKings website
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nandbytes View Drop Down
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 24 May 2020 at 12:32
Originally posted by jkkyler jkkyler wrote:

Unfortunately not 'special order" - no refund exchange only and the owner is a jerk but I really wanted to help out the staff and employees who are hurting. I will get it eventually. WIll just use the 14mm 2.8 rokinon and maybe even try the zeiss 16-35 wide or nearly wide open and f/4.0 but bump the iso a couple stops normally I shoot around 1600-3200 but the A7iii is supposedly iso invariant from 100-500 then from 640-512,000 so Shooting at 6400 or a stop higher may work on that f4 - not for publishable or blow ups but for 4x6/8x12 or desktop viewing


that kinda sucks! do they have a 24GM in stock you can may be exchange it for?
my flickr
A7RIV & LX100ii
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