Sigma (AF) 90mm f/2.8 vs Tokina AT-X 90mm f/2.5

[caspert79]

An infinity test and a bokeh test of both lenses. WB correction applied for both lenses (NB the Sigma needs more correction).

infinity comparison by devoscasper, on Flickr

Both lenses are really sharp centrally starting from wide open; the Tokina a bit sharper wide open, but with more CA. The Tokina needs more stopping down for sharp corners, but it corners become a bit better than the Sigma's at smaller apertures. @f/11, a little flare was visible on the Tokina's image, causing some contrast loss. Preventable when a hood attached.

Then, bokeh:
bokeh comparison by devoscasper, on Flickr

The Tokina is better here IMO. Because of its larger aperture, bokeh balls are bigger. When stopping down, the Sigma's hexagonal bokeh balls are quite harsh, whereas the Tokina's bokeh remains quite soft. Despite the less perfect bokeh of the Sigma (it won't show in all circumstances), in other respects it's a very good performer. It's small size and good build quality are a plus as well.

[blotafton]

Thanks for posting! I have the Tokina and have done a few landscape shots and don't like the the results that much. But up close it's great.
There have been a few 90mm manual version Sigmas for sale for very good prices lately. Maybe I should get one.

[caspert79]

[blotafton]

[caspert79]

[stevemark]

Thanks for sharing the results - as I own neither the Tokina nor the Sigma, I can't contribute anything meaningful

S