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Sharpness 
The Tamron 35mm ƒ/1.8 Di VC USD SP offers decent results for sharpness when used at its maximum aperture of ƒ/1.8, and improves remarkably when stopped down. When the lens is employed on a sub-frame camera like the Canon 7D, the results are slightly better in the corners because the lens is trained on a smaller capture area.

The "worst" results are found with the lens mounted on a full-frame camera like the Canon 1Ds mkIII, where corners are slightly soft at ƒ/1.8; there is a sweet spot of sharpness in the center. Stopping down even just a third of a stop to ƒ/2 shows significant improvement, but one needs to go to ƒ/2.8 to get better results for sharpness: at this point it's getting to the point where it's almost tack-sharp across the frame.

At ƒ/4 and greater, the lens offers its sharpest performance, essentially, tack-sharp across the frame. This trend continues to ƒ/11, where we begin to note the impact of diffraction limiting, but even at ƒ/16, the impact is only slightly noticeable.

Chromatic Aberration 
The Tamron 35mm holds up well against chromatic aberration - there is some visible, mostly in the corners and in areas of high contrast - where it manifests as color fringing, in the cyan-magenta spectrum.

Conclusion 
There's a lot to like in the Tamron 35mm ƒ/1.8 Di VC USD SP. One usually expects the third-party manufacturers to produce lenses that are less expensive than the name-brand manufacturers, but in this case, Tamron has produced a superior lens and priced it for at least as much as its Canon equivalent, making it an attractive option indeed.

다른 참고 리뷰:http://www.the-digital-picture.com/Reviews/Tamron-35mm-f-1.8-Di-VC-USD-Lens.aspx