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Get information and user reviews for this lens from Amazon: Tamron SP Autofocus 24-135mm f/3.5-5.6 AD Aspherical (IF) Lens for Nikon SLR Cameras
The Tamron AF 24-135mm f/3.5-5.6 AD Aspherical (IF) SP is indeed a worthy competitor for the Canon EF 28-135mm f/3.5-5.6 USM IS. The resolution and vignetting figures are slightly superior whereas it’s a tie regarding distortions. The Tamron shows a rather weak CA characteristic though. The build quality of the lens is very decent but it leaves a little to be desired regarding AF speed. Due to the 1.6x cropping factor on APS-C DSLRs the range isn’t all that attractive than it used to be so shopping for a new ones seems rather pointless regarding the existing alternatives. However, on the long term Canon users may see mainstream full frame DSLRs where the lens could show its old qualities again. “¦ READ FULL REVIEW
Other Tamron 24-135mm f/3.5-5.6 AD Aspherical (IF) SP AF Reviews
This lens is an ok performer wide open but did show some significant softness on the left side of the frame at 35mm and 52mm focal lengths on the sub-frame body. Closing the aperture just one stop made for substantial improvements in sharpness, with good to very good sharpness in the middle of the frame, and only minor softness in the corners and edges. Two stops down, it gets sharper yet at wide and medium focal lengths, but softens slightly due to diffraction limiting at the telephoto end of its range. All in all, this is a good lens for sub-frame cameras, at a good price. As is generally the case with inexpensive lenses, it will do best if you can afford to stop it down by one or two f-stops, but when you do so, it will reward you with very good images, at an affordable price. “¦ READ FULL REVIEW