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Owner reviews: Tamron 20 mm f/ 2.8 Di III OSD M1:2 F050
The overall image quality is very good, in my opinion. I was actually rather impressed given some of the less-than-amazing reviews of this lens that I’d read right after it hit the market. The center of the image is exceedingly sharp and crisp, and edge/corner sharpness is respectable as well when stopped down to f/4 or higher. As far as I can tell, there isn’t a noticeable color bias with this lens. Chromatic aberration is very well controlled at all aperture settings, based on my testing. Bokeh is pleasing enough, although it likely won’t wow anyone…and for a wide angle lens, this is perfectly acceptable.
It's light and small, but doesn't feel like a toy.
AF is pretty solid in AF-S, but struggles a bit more in AF-C, especially in less than ideal lighting. There is some noise, but it's probably not enough to bother video uness you are relying on the camera's mic to capture audio.
Like most wide angle lenses, tihs one has quite noticeable barrel distortion and vignetting. There is a lens profile for this lens in Adobe Camera RAW, and that does address both distortion and vignetting. However, to fully correct for the distortion also really streteches the very edges of the image in ways that might be noticeable and off-putting in some instances.
Full review with sample photos is here: https://tightcamera.com/tamron-20mm-review/
If you are looking for a wide prime for street vlogging that needs super-quiet and very accurate continuous autofocus, this is NOT your lens. For the other 95% of us, the Tamron 20mm is a really good inexpensive option to put a wide prime lens in your arsenal. It’s sharp with very good IQ, has okay AF, is small and light, and won’t break the bank. Also, it can almost take the place of a macro lens with it’s super-short minimum focusing distance. Hard to beat it as a value lens, in my view.