Blurryeyed Loc: NC Mountains.

The Tokinas are very good lenses and tend to be much less expensive than the OEM lenses. I don't think that the Sigma was very stellar, I have a friend that has taken some amazing photos using the Tokina 11-20.

Dziadzi Loc: Wilkes-Barre, PA

Decisions, decisions

Hbuk66 Loc: Oswego, NY

I use an AF Nikkor 20mm f2.8 and I am impressed with the results...

fergmark Loc: norwalk connecticut

Be sure about the compatibility . DX If I remember right you have one of the rebels?

ELNikkor

Nikon 10-20

camerapapi Loc: Miami, Fl.

Selecting lenses is a personal matter. Some photographers are happy using a 24mm lens while others prefer wider views. Perhaps you own the 18-55 kit lens. Is 18mm enough for you or perhaps you have decided to go for a wider view because 18mm is not enough for your needs.
The three lenses you mentioned are extreme wide angles. The Tokina has the advantage of a large aperture at f2.8 which could prove very useful in low light and I know that the reviews are very good.
Regardless of your choice keep in mind that wide angles expand the background while they make prominent the foreground. You have to be close to your subject for better shots.
If you want it for landscape photography keep in mind those lenses are not to grab everything in sight, they do not work very well that way.
I am sure any of those three lenses will fit your needs.

Charlie'smom

If you do, let me know what you think of it. I’m really looking forward to getting mine (hopefully) today.

gvarner Loc: Central Oregon Coast

I have the Sigma 10-20. It's a great lens at a decent price.

Nosaj Loc: Sarasota, Florida

The Sigma 10-20 Is a very worthy lens which us now selling for a reasonable price.

Boris Ekner Loc: From Sweden, living in Guatemala

When I searched for a wide angle lens I did review your options. From my opinion the Nikon aperture is too dark, as is the Sigma with its reputation of less build quality as well.

As the Tokina 11-20 is considered the best one on the market that’s the one I got. It hasn’t let me down once. It’s a hell of a good lens.

Lenstip.com has more info.

kdogg Loc: Gallipolis Ferry WV

Just got the Tokina 11-16 2.8 in Canon mount and took it on a trip to the Oregon coast. Performed beautifully, love it, got it off Ebay for $230.00.

imagemeister Loc: mid east Florida

I like the Tokina 12-28 for versatility of the range. Flip a coin for the rest on your list ....

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Flash Falasca Loc: Beverly Hills, Florida

Tokina AT-X Pro 11-20/2,8 DX great lens

amfoto1 Loc: San Jose, Calif. USA

The Nikkor AF-P 10-20mm DX VR is pretty plasticky, but it's capable of making very good images and one of the most affordable UWA available. It's also compact and lightweight. (The Nikkor AF-S 10-24mm and AF-S 12-24mm UWA zooms are ridiculously expensive... fine lenses, but no better than a lot that sell for far less $.)

The Tokina 11-20mm DX is a fine lens, IF you really need f/2.8. Frankly, most people using ultrawides really don't need large aperture lenses. But some do, such as astrophotographers who want a brighter viewfinder to shoot at night and photojournalists. It's a lot bigger, heavier and more expensive than the Nikkor. Tokina also made an earlier 11-16mm f/2.8 model... Nikon shooters have to be careful, though. There are two versions of that lens. The first one, in Nikon mount, lacks a focus motor and will only autofocus on D7000-series and higher models. It will not AF on a D3400 or any other D3000/D5000 models. The Tokina 11-16mm f/2.8 "II" in Nikon mount has built-in focus motor and can AF on those cameras, but generallly sells for a bit more. Note the very narrow range of focal lengths.

Tokina also offers a very good 12-28mm f/4 (and there was an earlier 12-24mm f/4 model, which came in motorless earlier version and in-lens AF motor "II" version, too... same as the 11-16mm... in the Nikon mount).

The Sigma 10-20mm f/3.5 is a decent lens, too... but also one of the largest and heaviest of the UWA. Until a couple years ago, there was a cheaper, smaller, lighter Sigma 10-20mm f/4.5-5.6 HSM that was pretty good. It was discontinued, but is still available on the used market.

Finally, Tamron has recently revamped their 10-24mm, adding VC image stabilization. It and the Nikkor 10-20mm VR are the only two UWA available for Nikon right now, that have stabilization. Frankly, it's not as necessary a feature as on UWA lenses, as it is on telephotos. But, hey, it's always nice to have stabilization. There is an earlier Tamron 10-24mm, but I never felt it's image quality was as good as the Tokina. (I haven't personally compared the Nikkors mentioned above, but they all get good reviews.)

chrisg-optical Loc: New York, NY

I am looking at that lens too but I have a D7200 and the chart says "limitations, firmware upgrade" since it's an AF-P lens - other than the firmware upgrade are there any other limitations?