- Compact and lightweight for the aperture and focal range
- Weathersealed against dust and moisture
- Very good image sharpness starting from f/2.8
- Good control of longitudinal chromatic aberration
- Excellent color and contrast
- Close focus ability adds to versatility
- Very affordable
- Bokeh is mediocre
- Barrel distortion at the wide end and pincushion at the long end
- Some lateral chromatic aberration
- High spherical aberration at very close focus when shot wide open with longer focal lengths
- Lens materials do not feel premium
- Some hiccups with autofocus with standard camera settings Edit: Tamron has released a firmware update that has fixed autofocus issues.
The Tamron 28-75mm f/2.8 is a fast standard zoom that is an excellent value for money. It’s rather sharp, and produces very pleasing images with a good overall image rendering. Bokeh can get a bit chunky at times, and there’s some distortion that you’ll have to correct, but when taken as a whole, the optical performance of the lens is quite good. Considering the reasonable $799 price tag, and the very high price of its competition, the bang for the buck is the best among all the standard zooms for the full-frame E mount.
In addition to the good optical quality and affordable price, the Tamron succeeds most due to its compact nature. In comparison with the Sony 24-70mm f/2.8 GM, the Tamron 28-75mm is so much lighter and easier to handle as a walk-around lens that it would be hard for me to entertain the GM even if their cost was similar. While improvements could be made, it’s a very solid effort from Tamron, and will fit the bill for a wide range of Sony shooters. I started out a bit wary of the lens, but have grown more and more fond of it the more I’ve used it. I’ve found it to be a very versatile lens with very good image quality, and it’s earned a permanent spot in my bag.
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