If you own a cropped sensor DSLR and are in the market for a great zoom lens, then the Tamron 28-75mm f/2.8 is an excellent buy.
I tested this lens on both the APS-C sensor and full frame sensor cameras. I used the Nikon mount, though Tamron made the Sony, Pentax, and Canon mounts as well. It is good to see Tamron is making this excellent lens for so many mounts.
Originally designed for a full frame sensor camera, the focal length is not very comfortable on an APS-C (cropped) sensor DSLR.
The 28mm wide focal length is not wide enough when used on a cropped sensor DSLR camera. The 28mm focal length will become 42mm focal length in terms of the full frame equivalent.
However, the image quality is much better in the cropped censor camera than the full frame equivalent. This is because the cropped sensor camera can suppress the vignetting and chromatic aberration on this lens.
If you use an APS-C DSLR and require a wider angle and more versatile focal length, you are better off buying the Tamron 17-50mm f/2.8 VC lens.
With the Tamron 28-75mm f/2.8, I was able to get extremely sharp images, perhaps the best among all Tamron zoom lenses, when used in conjunction with an APS-C camera.
Distortion, chromatic aberration, and vignetting are all minimal to negligible. If you feel that you can adjust to the awkward zoom range, you’ll get yourself a great zoom lens for your cropped sensor camera.
I was able to take some really sharp group photos and shoot some interesting still life with this lens. The out of focus blur (also known as bokeh) is simply excellent at the widest aperture of f/2.8.
For those using full frame DSLRs, the lens does not perform as well compared when used in conjunction with a cropped sensor camera.
All the distortion, vignetting and chromatic aberration will start to show up in the corner. This of course can be remedied by using the proper post processing techniques.
In conclusion for this Tamron 28-75 review, this lens is an excellent professional lens at a bargain price.
If you are using a cropped sensor camera and simply want to get sharp, professional quality images out of your camera without having to spend a lot of money, then this is the lens to go after.