Sigma 20mm ART Review (14-24 Nikon Comparison) 

I own this lens and had an issue with auto focus initially. Changing the micoadjustment settings in the camera (-13) via Focal helped a great deal. Also, on a portrait of my daughter, I noticed the autofocus had grabbed onto a singular hair that had dropped down about a quarter inch in front of her face. The narrow depth of field at 1.4 meant that her face was clearly thrown out of focus. Have to be dead on at that aperture. Really enjoy this lens. Thanks for the review

Thanks for sharing! Just a little correction, though- the distorted looking stars you pointed out near the top of the frame on your astro pano: this is not barrel distortion, it is called coma. It's a problem that many faster wide angle lenses have with small bright points of light, but some do better than others. Because of the severity of this problem on the Sigma, many people don't recommend using this lens for astro despite the amazing benefits an f/1.4 aperture gives you. Barrel distortion is the distortion you see (also on many wide angle lenses) where the center of the frame kinda looks convex with squished corners and edges - almost like a very mild fisheye effect.

Hi, Yes 90% of sigma lenses have AF problem from 2 meter to infinity! I got 20mm and 35mm 1.4 for my d810 and found on both of them AF issue about missing or front,back,soft focus from 2 meter to infinity! I am going to bring body and lenses to sigma service this week and they said they can fix this problem! is very known problem on 90% of their lenses!!!

Lee SW-150 filter system have adapters rings for both of these lenses. I have it for the Nikon 14-24mm and it works just fine.

The AF on Sigma ART lenses are always inconsistent, and I hated most of them. The Sigma 20mm f/1.4 ART can be forgiven however, as such a wide angle lens I often use the live view to focus. That said, this lens is really good for taking landscapes and night skies.

That is not barrel distortion deforming the stars at the edge of your image, that is coma.

My Sigma f/1.4 have good AF on my Canon 5Ds, also at f/1.4. I did some AF adjustment in camera. It's a great lens!

Great review, thanks.

Nice presentation hope you wil realese a New video later With sigmas New 12-24mm v3 sorrey for my bad inglish im norwegian

now that the 16mm f1.8 art is out ? would u buy this lens over the 20mm

you did not really compare the 14-24 to the sigma properly, what about the 14-24 for astro? whats the difference?

I wonder if using the usb dock would help with the autofocus

Nice video. By the way, you may pronounce Nikon with a long "i" (aí), but not Nikkor (i). The doubling of the consonant shortens the vowel and you may not diphthong it ;-)

Hi, you noted that 20mm is not the same in each lens? did you take into account the length of each body making the filed of view slightly different?

You don't know what focus breathing is ?

Don't review any Sigma Art lens with adjusting the focus with a USB dock. Proper calibration to your body transforms it.