I had the Sigma 10-20, and it just never seemed fully sharp, especially toward corners with a little more distortion than I wanted. I bought this Nikon 10-24mm a couple years ago for my Nikon D7200 when I decided to get rid of the Sigma lens. This Nikon lens was a noticeable improved.
A few months ago I got a Nikon D750 full frame with the 24mm-120mm lens. But, there were some wide angle shots I needed and figured the Nikon 10-24mm DX lens would leave a lot of circles and major vignetting, but I decided to try it out. To my surprise, zooming between 10mm up to 15mm gave me full frame coverage. After 15mm you start to get the corner vignetting (since it's a DX lens and not FX). But, just what I needed.
I didn't have to buy a 14mm lens, which is what I was contemplating, since I now have that 10-15mm range to work with. This DX lens is an f/3.5-4.5, however, for the 10-15mm range, it stays between f/3.5-4. Point is, if you have this lens, and go full frame, you still have a good wide angle zoom.
A few months ago I got a Nikon D750 full frame with the 24mm-120mm lens. But, there were some wide angle shots I needed and figured the Nikon 10-24mm DX lens would leave a lot of circles and major vignetting, but I decided to try it out. To my surprise, zooming between 10mm up to 15mm gave me full frame coverage. After 15mm you start to get the corner vignetting (since it's a DX lens and not FX). But, just what I needed.
I didn't have to buy a 14mm lens, which is what I was contemplating, since I now have that 10-15mm range to work with. This DX lens is an f/3.5-4.5, however, for the 10-15mm range, it stays between f/3.5-4. Point is, if you have this lens, and go full frame, you still have a good wide angle zoom.
