Sigma 14mm Art lens problem shooting at night, anyone else had/have this?

[macfly]

I'm now on my second 14mm Art lens in the quest to find sharp stars at the edge of the frame, shooting at night, but both the versions I have are turning the stars in the corner of the frame into flying saucers! This has wasted two desert trips, as the images are unusable like this. I love the 14mm for the night sky, but this lens seems a bit of a dud. Anyone else suffered this?

[Aram Hăvărneanu]

I don't have that lens, but it's called coma. It goes down if you stop down the lens. It's a property of the optical design, changing the copy of the lens will not get rid of it. Some lenses are specifically designed to correct for coma.

[kimballistic]

Personally I haven't seen a single lens that doesn't have coma along the edges and in the corners wide open or stopped down to something suitable for astro like f/2.8.

If anybody knows of any for Nikon F mount, I'm all ears.

[kers]

Personally I haven't seen a single lens that doesn't have coma along the edges and in the corners wide open or stopped down to something suitable for astro like f/2.8.

If anybody knows of any for Nikon F mount, I'm all ears.

Try sigma 40mm f1.4 art

[BernardLanguillier]

The Noct 58mm 0.95 appears to have very low coma from wide open.

Overall all the S lenses have been strongly optimized for all the aberrations not easily correctable in post, including coma.

[kimballistic]

Try sigma 40mm f1.4 art

Duh, I forgot about that one.  Good point!  The coma performance is incredible:

https://www.lenstip.com/548.7-Lens_review-Sigma_A_40_mm_f_1.4_DG_HSM_Coma__astigmatism_and_bokeh.html

The Noct 58mm 0.95 appears to have very low coma from wide open.

Overall all the S lenses have been strongly optimized for all the aberrations not easily correctable in post, including coma.

Glad to hear.  Eventually I'll switch back to mirrorless, but right now I'm enjoying my D850 too much.

[mcbroomf]

I'm now on my second 14mm Art lens in the quest to find sharp stars at the edge of the frame, shooting at night, but both the versions I have are turning the stars in the corner of the frame into flying saucers! This has wasted two desert trips, as the images are unusable like this. I love the 14mm for the night sky, but this lens seems a bit of a dud. Anyone else suffered this?

The Sigma 14/1.8 is well known to have coma until is is stopped down to ~2.8.

[Two23]

I guess you have to choose between ultra wide or ultra fast.


Kent in SD