Thought some of you might like a closer look at the Tamron AF 17-50mm f/2.8 XR Di-II LD Aspherical (IF) zoom lens, model A16S. For those of you who aren’t familiar with the lens, it is a 17-50mm zoom lens with a constant maximum wide aperture of f/2.8. Of course the lens I purchased was for the Sony Alpha and Minolta AF mounts, but Tamron also makes the lens for the Pentax, Canon, and Nikon DSLR cameras. This lens does not come with Tamron’s Vibration Compensation (VC) technology, but that is immaterial to me, since I am shooting with a Sony Alpha, which has Super SteadyShot technology in the camera body. If you are looking to get the lens for the Canon or Nikon, you may want to consider the Tamron SP AF17-50mm f/2.8 XR Di II VC LD Aspherical Lens, model B005, which does employ VC.
If you look at the Tamron website, it gives you a handy legend to decipher the names of their lenses. A quick look at their legend reveals what Tamron AF17-50mm f/2.8 XR Di-II LD Asperical means. AF stands for what you would probably guess, Auto Focus. The XR and LD refer to the glass used in the lens, and indicates that extra refractive index glass and low dispersion glass were used on some of the lens elements. Di-II is Tamron’s nomenclature for lenses made specifically for digital cameras with smaller sensors, no larger than 24mm x 16mm. Finally, the IF indicates an internal focusing design was used, this is so that when the lens focuses, it does not rotate any filters or hoods that are attached to it.
The Tamron A16S zoom lens accepts filters sized 67mm. When fully retracted the lens is 3.2 inches long, and extends to 4.45 inches; It weighs 15.2oz. Minimum Focusing distance is 10.6 inches.
The internal focusing is a nice touch, even if expected these days. Additionally, the Tamron A16S sports a zoom lock switch, locking the barrel in the fully retracted position.
Included Lens Accessories
Lens Mount for the Sony Alpha and Konica Minolta AF cameras.