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01-13-2017, 06:46 AM   #1
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Samyang 14 2.8 vs Samyang 24 1.4 for Astrophotography

If you could only have one of these lenses: Samyang 14 2.8 vs Samyang 24 1.4, which would you have and why?

I will be shooting on the Pentax K-1 and I'm almost certain that these lenses will only get used for Astrophotography and landscape (day and night). I know each lens has their pros and cons and I'm hoping to hear what you feel they are. What I know already is that the 14mm will give me a wider range, but it's slower, the IQ is not as high as the 24 mm, and the distortion is supposed to get bad at times. I also know the 24 will give me better IQ, is faster, less distortion, but it will give me a narrower field of view. That's where my knowledge about these too lenses ends. Since I am not all that seasoned with astrophotography and landscape shooting, I don't really know which one to start planning for.

I do have a Pentax DFA 24-70 2.8, in case that should make any difference in my decision making. As always, thank you in advance!

01-13-2017, 06:59 AM   #2
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I got the 14mm instead of the 24mm for the following reasons:
a) Really incredibly wide
b) Outstanding optics
c) Super affordable

The 24mm has faster aperture, but it costs more and, while good, the optics have not received the same praise as the 14mm back when they were introduced.
That said, 14mm is really wide on APSC, it is awkwardly wide. I dont know how you can use 14mm on FF, because everything that is not within 1m becomes tiny. If you want to photograph mounts, they need to be right in front of you or they disappear and the photo is full of foreground and sky. The 10mm difference between 24mm and 14mm is massive. So for a lot of people, I recommend the 16mm f2 instead - but the 16mm is not FF lens.
Since you already have the 24-70mm it might make more sense to go for 14mm, unless you really like the 24mm FoV and just need faster aperture.
01-13-2017, 07:15 AM   #3
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For astrophography, it would be the 24mm for its 1.4 aperture. The amount of light is the limiting factor in astro and there's no substitute for a large aperture. The 2-stops difference between these lenses is a huge advantage for astrophotography. If you want to shoot wider, it's always possible to stich some 24mm shots and get as good, if not better, results that what you will get with the 14mm lens.
01-13-2017, 08:36 AM   #4
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Don't forget there is also the new 20mm f/1.8 lens for full frame as well.

01-13-2017, 08:42 AM   #5
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To make things more difficult: The new 20mm f/1.8 doesn't look too shabby either for this purpose on Gippsland Images. Photography by Daniel Gangur | REVIEW - SAMYANG 20mm f1.8 ED AS UMC Wide Angle Lens.
01-13-2017, 08:57 AM   #6
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QuoteOriginally posted by SointulArt Quote
Don't forget there is also the new 20mm f/1.8 lens for full frame as well.
Is this the Rokinon equivalent?

https://www.amazon.com/Rokinon-20mm-Wide-Angle-Pentax/dp/B01M0CSO35/ref=sr_1...rokinon+20+1.8

---------- Post added 01-13-17 at 07:58 AM ----------

QuoteOriginally posted by JensE Quote
To make things more difficult: The new 20mm f/1.8 doesn't look too shabby either for this purpose on Gippsland Images. Photography by Daniel Gangur | REVIEW - SAMYANG 20mm f1.8 ED AS UMC Wide Angle Lens.
I think this actually makes things easier This looks like a very acceptable middle ground. I have a 24mm already and 14 just feels too wide on full frame. Thanks!

---------- Post added 01-13-17 at 08:14 AM ----------

QuoteOriginally posted by reivax Quote
Is this the Rokinon equivalent?

https://www.amazon.com/Rokinon-20mm-Wide-Angle-Pentax/dp/B01M0CSO35/ref=sr_1...rokinon+20+1.8

---------- Post added 01-13-17 at 07:58 AM ----------



I think this actually makes things easier This looks like a very acceptable middle ground. I have a 24mm already and 14 just feels too wide on full frame. Thanks!
On second thought, it just changes things. Now, I'm debating between the 24 1.4 & 20 1.8. Extra "width"? Or extra light? This is tough.
01-13-2017, 09:42 AM   #7
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Isn't the 14mm for ASP-C? How does it covers FF?

01-13-2017, 09:49 AM   #8
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QuoteOriginally posted by Markovo Quote
Isn't the 14mm for ASP-C? How does it covers FF?
The 14mm is a FF lens. The 16mm is APS-C.
01-13-2017, 10:08 AM   #9
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10mm and 16mm are APSC, 14mm and 20mm and 24mm are FF. But feel free to double-check
That 20mm look cool, but check its lab reviews how it manages coma.
Also, I dont think astrophoto is just about aperture. A wider FoV lets you take longer exposures without stars beginning to trail. You can bring in a lot of light like that. FoV will also affect composition and how "big" the stars are. UWA lenses let you capture a lot of stars, but they are all tiny tiny.

Just flip a coin or get the lens that is on sale You will need to get all of them one day, anyway
01-13-2017, 11:01 AM   #10
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QuoteOriginally posted by Na Horuk Quote
10mm and 16mm are APSC, 14mm and 20mm and 24mm are FF. But feel free to double-check
That 20mm look cool, but check its lab reviews how it manages coma.
Also, I dont think astrophoto is just about aperture. A wider FoV lets you take longer exposures without stars beginning to trail. You can bring in a lot of light like that. FoV will also affect composition and how "big" the stars are. UWA lenses let you capture a lot of stars, but they are all tiny tiny.

Just flip a coin or get the lens that is on sale You will need to get all of them one day, anyway
That is probably what I will end up doing, but in your opinion, would you rather have the 20mm? Or the 24mm?

Thanks!
01-13-2017, 12:40 PM   #11
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What ever you buy make sure you do all kinds of test on your new lens. Bought a Samyang 14mm 2.8 and was very soft over all on a K5IIs.

I think it would shine on a FF body with the right copy.


Brian
01-13-2017, 12:58 PM   #12
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QuoteOriginally posted by Storm Chaser Quote
What ever you buy make sure you do all kinds of test on your new lens. Bought a Samyang 14mm 2.8 and was very soft over all on a K5IIs.
Yep, this is important, especially for third party lenses. My Samyang 14mm is a bit decentered, and I returned the first copy I got for the same reason.

I have the 14mm for a while, some years, but I wanted something not as wide. I almost got the Samyang 24mm, but then through the grace of a forum member here found a good copy of the DA 21mm. I only shoot APSC cameras, and the 21mm FoV is more comfortable, better for everyday stuff and most landscapes. 14mm is reallly wide, even on APSC. The DA 21mm has many good points, but its probably not the best choice for astrophoto (coma, f3.2, not FF). I only know about APSC, though, and I did my research before the Samyang 20mm was announced. If starting today, I would probably get that one. But I dont regret ending up with Samyang 14mm, Pentax DA 21mm, Pentax M 28mm as my wide angle lenses.
01-13-2017, 03:34 PM   #13
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I have both and swear by the 24mm for astrophotography with the K-1.

As soon as the price comes down, I'll be buying the 20 and selling the 14.

The 24mm is the king.
01-13-2017, 04:15 PM   #14
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Have you tried your 24-70 wide open for pictures of stars? At the very least it will give you an idea of how much speed you need, even if this lens wouldn't be your first choice for astro.

If you can't decide between those 3 focal lengths, there's always the 15-30 mm f/2.8? Look over at lonelyspeck, they really like the Tamron 15-30 for the fullframe systems, and it's their recommendation for Nikon Canon and Pentax.
01-13-2017, 05:57 PM   #15
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I second the advice about checking the Samyang 14 for being decentered. I have the Bower copy of this lens and the first one was decentered, returned it to B&H and the second one was good. I don't use it too much since getting the DA15.
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