Hi Tee Why,
Tee Why wrote in post #2998941
You know, I've briefly tried out the Tokina 10-17 and the Pentax 10-17 and compared to a 10mm end of the ultrawide, it's not much wider and the distortion limits its diversity.
Seeing as you already have a 10-22, I'm not sure it's worth it. I was thinking about trading in the 10-20 for it, but after trying it out, I gave up on that idea.
I'm sorry, but I respectfully disagree. There is a tremendous difference between the two - I have both. The 10 mm on the 10-22 rectilinear zoom has an AoV, diagonally, of 107.5 degrees, the Tokina 10-17 fisheye zoom gets to 180 degrees diagonal, plus, it has a fisheye type projection.
Just compare the two following pictures, first the Tokina, at 10 mm, closest focusing distance:
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And here is the 10-22 at 10 mm:
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As you can see there si quite a difference in AoV, and in distortion. The wings and body of the plane are still shown at the correct angles, while the pergola parts in the top of the fisheye picture, although they are at right angles, are totally bent.
BTW, the flare and ghosting in the plane pic was deliberate; this has become a lot less now I uses B&W MRC filters rather than Canon UV Sharp Cut filters, although the effect was deliberate here, and in the fisheye pic the front of the flower was actually touching the front element of the lens!
Kind regards, Wim