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Excellent 1:2 macro lens. I love the rendering on both Sony mirrorless and on film (Canon AE-1). Works well as a short telephoto lens as well. You can see my review of the lens by following the link below:
http://www.theweekendlens.com/tokina-at-x-90-f25-macro.html
Super and useful lens. Best macro I have used. Got mine on ebay for $20 as part of a broken pentax camera and will never part with it. It is my favorite lens and it produces stunning photos. Too sharp for portraits. Some flare in sunlight. Love this lens.
I shoot a lot of closeup photography, and this lens has hardly been off my camera since I got it a couple of years ago. Very sharp, especially f5.6-11, the f2.5 max aperture gives a bright viewfinder image and shallow DOF if required. Because the lens only extends to 1:2 magnification it´s compact size makes it easier to keep the lens stable. A 1:1 matched extender was sold with it I believe, but I don´t have (or need) one. I bought a rather battered and well used lens, so I´m not sure about the original build quality. My 7.0 build rating may be conservative....
Combines very good sharpness with a beautiful bokeh, which is rarely found in macro lenses. I´ve used it without the extender mostly. Lens hood click-on style and sufficiently long.
Build quality average at the most.