Sigma 24 mm 1.4 Art Series Or Irix 15mm 2.4 ? (For astrophotography)

Yom Tov

Yom Tov

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Orfead
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As a matter of fact , I want to ask just one thing (It would be a great plesure to know your thoughts about this ) , Im about to buy a new lens for landscape astrophotography (I own Nikon D750).I have searched on my own just to see some other alternatives .I end up looking 2 lenses. One is the sigma 24 mm 1.4 Art and the other one is the Irix 15 mm 2,4. I presume that both are quite good but the reviews talking specifically for the astrophotography performance is quite limited and thats the main reason I want your views . I have read many articles about the irix one , some just tell that it is quite good for the price , some others claim that the coma and generally the aberation is extreme . Now about the sigma , I dont really know if have to invest €268.96 more as Im not sure if the overall performance is better . (I also saw the 20 mm 1.4 sigma art but I didnt really understand whats the difference)

What are thinking about it , do I have to invest my money on the sigma or on the irix or do you recommend something else? (take into consideration that my budget has a limit at 940 euros )
If someone have sample images to illustrate the performance would be great!
 
I've actually owned all three of these at one point in time or another. Seem to have gone through a lot of wide angles looking back!

I don't seem to have any examples from the Irix on my flickr but I've stuck some stuff from the other two below. Astro isn't necessarily my forte but maybe some help.

I really would happily use any of thsee for astro but I must admit, coma in the corners has never bothered me as much as it seems to bother some people. Corner sharpness is important but I don't mind the odd little bat wing. I don't think any of them are that bad for coma anyway though. Maybe irix slightly better than the Sigmas in that regard.

But of the three, I'd probably go for the 20mm if purely for astro. It's hard to overlook the potential 1.5 stop advantage. You shouldn't underestimate how useful a 1.4 aperture is, even if it's just for finding focus. Stars are much brighter in live view at 1.4 than 2.4. It's a very sharp lens, even wide open and 20mm is wide enough most of the time. The 24mm is excellent too but maybe not wide enough at times. Its biggest benefit here is probably that it's quite small, and has a normal filter thread so probably makes the best all rounder if you use it for other stuff. I like the irix lens, it's well built with some neat innovations but it felt like a one trick pony for me. If I only used it for astro, it maybe would make a lot of sense but the 95mm filter thread wasn't much use for me for other stuff.



Mosedale Milkyway by G.A.D, on Flickr

Pre-dawn at Sycamore Gap by G.A.D, on Flickr

GRA_3574.jpg by G.A.D, on Flickr
 
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