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20mm 1.8G or 24mm 1.4GM for Astrophotography

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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 Topic: 20mm 1.8G or 24mm 1.4GM for Astrophotography
    Posted: 20 April 2020 at 22:35
So my planned trip to Puerto Rico got cancelled due to the plague (Covid19) and I have decided to take the money I was refunded and get a new Astrophotography lens.

I am undecided between the 20mm 1.8G and the 24mm 1.4 GM
Any advice or impressions happily accepted.


FWIW my current astro lens is the Rokinon 14mm 2.8 and my other wide angle lenses consists of the
Zeiss Vario-Tessar T* 16-35mm f/4 FE OSS
Also have the sony 24-240 3.5-6.3 which goes down to 24 and 3.5 but I would use the zeiss at 24 and f4 before usiong that lens. It is an 'all rounder' for when I am out and about and don't know what length I may find myself needing and don't want to carry multiple lenses
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addy landzaat View Drop Down
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 20 April 2020 at 23:54
The 20mm is wider and cheaper. Unless you think the difference between f/1.8 and f/1.4 is significant, the 20/1.8 seems the logical choice.

Some relevant reviews:
https://www.colbybrownphotography.com/gear-review-the-new-sony-20mm-f-1-8-g-lens/
https://www.nateluebbe.com/journal/sony-20mm
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Post Options Post Options   Quote jkkyler Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2020 at 01:40
That's kind of what I asking advice on - which is likely to be more significant the 4 mm of extra coverage or the 1.4 to 1.8 difference in light gathering. IS the coma and astigmatism corner to corner that much better in the GM version vs the G. and if so how significant are the differences once you factor in a $500 difference (over 1/3 the cost of the G lens).


After looking at a few videos I think I have decided that the 20mm 1.8 G is the way to go. I am using an A7III and it appears the quality of the lens is superior to the sensor in the A7III. If I had an A7RIII and was shooting at double the resolution then I think I would go with the 24 1.4GM. I have gotten some great shots at 2.8 with my 14mm but it isn't at it's sharpest wide open and has some aberrations and I have found it to be too wide at times and I have had to crop. The 20 1.8 is very sharp wide open and so without having to stop down I think I'll be fine. THe $500 saved may just pay for a few days trip to B&B in a dark skies area.
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horizon View Drop Down
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Post Options Post Options   Quote horizon Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2020 at 01:51
From all the reviews that I've seen, most of the Astrophotographers are using the Tamron 15-30 or a Samyang lens.

I would not imagine that the Sony 20mm - 24mm would be any better for Astrophotography than the Sony 20mm 2.8 that I have been using (I still need to get a better Astrophotography Lens and I am looking at Both the Tamron and the Samyang and a Sigma) My Sony 20mm for Astrophotography is plain awful for coma, alot of the stars look like invading spaceships.

Have a look at the cloudynights forum about what lenses most dedicated Astrophotographers are using for their DSLR's. Obviously there are alot of photographers on there who are also using scopes, but there are just as many who are using DSLR Lenses.

Also take a look at Royce Blairs Astrophotography, he is using the Samyang lenses.

B&H Royce Blair Astrophotography

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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: 21 April 2020 at 03:01
I have the 14mm 2.8 Rokinon which is a Samyang (they are the same lens just branded differently). QC seems to vary WILDLY from copy to copy and the corners aren't particularly sharp. I consider mine 'okay'

Nevertheless it did give me this in an area with a lot of light pollution:




When the 24 1.4 GM came out a number of astrophotographers reported it as just amazing. Quite a few stated it was basically endgame. THe Sony 20mm 1.8 is new and does not have as much publicity and info but from what I have been able to gather it does compare very favorably to the 24 f/1.4GM enough to make it a purchase I reckon. If I don't love it I could probably sell it for nearly what It costs and revisit the 24 1.4.

https://alphauniverse.com/stories/sony-24mm-g-master--the-king-of-night-photography/
-This is the first lens I've used at f/1.4 that can produce pin-sharp points of light in the corners. I've been calling the Sony 24mm G Master the King Of The Night.

https://www.stanmoniz.com/blog/astrophotography-with-the-sony-gmaster-24mm-f14

-It really does feel like Sony tailored this 24mm f1.4 especially for the astrophotographer community. This lens answers the call for a really fast wide angle lens that can REALLY produce superior results. Seeing is believing and I am confident that when the word gets around of how TRULY amazing this Gmaster 24mm f1.4 is, it will be called the holy grail of lenses for astrophotography.


https://www.slrlounge.com/sony-24mm-f-1-4-gm-review-new-benchmark-of-fast-aperture-wide-angle-lenses/
-For astro-landscape photography, the Sony 24mm f/1.4 GM is a unicorn. It delivers incredible wide-open image quality, including not just decently low vignetting but also near-zero coma/astigmatism, as well as minimal general color fringing/blooming. Like Iíve already said, as a nightscape shooter, I simply didnít think such image quality was possible, at least not for less than $2K or less than 2 lbs. I guess was wrong!
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2020 at 07:17
I'd say 24GM is sightly better than 20G simply because of the f1.4.
Yes the 20mm wider FoV would let you shoot for sightly longer shutter speeds but if you factor is smaller aperture you'll be shooting at nearly double the exposure time as you'd with 24GM.
Longer shutter speeds isn't without it's own issues. For astro I'd take brighter aperture over longer shutter speeds anyday especially when you are nearly doubling your already long exposure.
Just my 2p.
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2020 at 07:28
Originally posted by horizon horizon wrote:

I would not imagine that the Sony 20mm - 24mm would be any better for Astrophotography than the Sony 20mm 2.8 that I have been using (I still need to get a better Astrophotography Lens and I am looking at Both the Tamron and the Samyang and a Sigma) My Sony 20mm for Astrophotography is plain awful for coma, alot of the stars look like invading spaceships.
Can you explain why you think the new Sony FE 20/1.8 will be as bad as the 1993 designed A-mount 20/2.8 for this? There is 25 years in between them.

Reviews say coma is well controlled on the FE 20/1.8:
https://www.dpreview.com/samples/2736959721/sony-fe-20mm-f1-8-g-initial-impressions-and-sample-gallery
https://www.albertdros.com/post/2020/02/16/sony-20mm-f18-hands-on-review-albert-dros
https://www.the-digital-picture.com/Reviews/Sony-FE-20mm-f-1.8-G-Lens.aspx

The fine folk over at Phillip Reeve think the Sony 24/1.4 is suitable for astro:
https://phillipreeve.net/blog/review-sony-fe-24mm-1-4-gm/

TBH, looking into this, either lens will be fine.
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Post Options Post Options   Quote Hezu Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2020 at 07:42
Originally posted by horizon horizon wrote:

From all the reviews that I've seen, most of the Astrophotographers are using the Tamron 15-30 or a Samyang lens.
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.

Found α universe article titled "The Best Lens for Astrophotography" and it promotes FE 1.8/24 GM, but then this story is from last year and thus before FE 1.8/20 G release. I haven't (yet) tried that newer lens either, but at least for non-astrophotography tasks for which I have used my FE 1.8/24 GM I have found it one of the best lenses I have ever owned, possibly even the best, but then comparisons with different focal lengths and apertures makes impossible to say that one lens (especially fixed focal length prime) is always the best for all situations.

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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2020 at 08:11
Having owned samyang 14mm/2.8, sony 20mm/2.8 on a-mount and 24GM (two copies actually) the samyang and sony are no where in the same league. The Samyang is possibly the worst UWA lens I have used but its also a good budget option. Sony for the time was ok but I wouldn't compare it against 24GM or by the looks of it the new 20G.

Currently I am using a sigma 14-24mm/2.8 ART (e-mount version). Including the hood its actually not much bigger than the 24GM but is it heavier. While it's not as bright it gives you a rather useful zoom range for astrophotography and bunch of different composition options that a prime may not allow (you can of course try stitching in post).

But all in all we are splitting hairs I think and being pedantic. I couldn't agree more with the quote below and also add sigma 14-24mm as another option.
I'd pick based on which focal length one prefers or the zoom.

Originally posted by addy landzaat addy landzaat wrote:


TBH, looking into this, either lens will be fine.



edit:
(p.s. there are also other good options I haven't mentioned like 16-35GM which is in a different pricing bracket, above mentioned sigma 14mm/1.8 which is massive, and laowa 15mm f2 which is manual with no EXIF etc).

Edited by nandbytes - 21 April 2020 at 08:16
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Post Options Post Options   Quote jkkyler Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2020 at 11:45
TBH, looking into this, either lens will be fine.


I think that is the bottom line. Everything I've read states that 24 1.4GM lens is awesome and there isn't as much but the consensus seems to be that the 20 1.8 is a hell of a lens as well and almost as good, wider, and $500 cheaper. I think I am going to try it but before I pull the trigger I may take my camer and tripod out in the backyard and put my 16-25 Zeiss f4 lens on and just look at the composition differences between 20 and 24 to get a better feel.


I've never owned a GM lens and have always kind of drooled at the thought of owning one and the fact that the 24 1.4 is 'affordable'- relatively speaking makes it an compelling buy but saving $500 and gettting a great lens would not bother me at all.
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Post Options Post Options   Quote nandbytes Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2020 at 21:19
The reason to own 24GM would be for it's rendering wide open in normal photography which 20mm F1.8 certainly can't match. It's rather nice.

Having recently sold my 24GM I'm looking to buy the 20G to try it out. But 24GM still remains one of my favourites.
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Post Options Post Options   Quote jkkyler Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2020 at 14:12
Decided to get them both and if I find I don't need one I'll sell it. Gonna order the 24 1.4 GM tomorrow and the 20 1.8 G when I get paid again in 2 weeks

Edit : changed my mind.(again). Decided to go with the 20 f1.8 and the 70-200 f/4 -makes more sense for my overall line-up

Edited by jkkyler - 07 May 2020 at 15:16
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Post Options Post Options   Quote addy landzaat Quote  Post ReplyReply Direct Link To This Post Posted: 07 May 2020 at 15:45
Changed your mind
Enjoy them and let us know how it all works.
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Post Options Post Options   Quote jkkyler Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 2020 at 17:22
Ordered my 20 1.8 today and also the 70-200 F4 G.
Will let you know how it turns out and perhaps submit some images. Got the 70-200F4 form MPB - "like new" condition with a 6 month warranty for $1069 seemed acceptable to me and ordered the 20mm 1.8 form the local shop for MSRP $898. I could have gotten it for 10% off at BHphoto but I know COVID19 has been killing local businesses and I wanted to support the local mom and pop shop (only one left in my city).
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