Tamron SP AF 17-50mm f/2.8 XR LD Aspherical (IF) Di11 Lens
September 29th, 2006
This lens is well built and specified for its ilk although it lacks the silent smoothness of autofocus by sonic motor. The bulk of the main barrel is taken up with the zoom ring, which is quite nicely torqued in its operation. The travel from the 17mm mark to the 50mm one is almost exactly a quarter of a turn and that extends the front element by some 30mm, although it does not rotate the front element. A zoom lock is provided to stop this extension during transport, although it was not needed with the lens being new. Forward of the zoom ring is a manual focus ring that has a distance guide marked on it. The (IF) in the long-winded title means internal focus, overcoming any physical change in the lens during the focussing operation.
The AF mechanism is a little whiny, although not obtrusively so, and accurate although it takes a couple of small jerks to get there in low light. The finish is a good standard and not as plasticy as some of Tamron’s older offerings.
Lens specifications:
- Focal Length 17-50mm
- Max aperture f/2.8
- Min aperture f/32
- Construction 16/13 elements/groups
- Min focus 0.27m
- Filter size 67mm
- Size 74×81.7mm
- Weight 0.434kg
- Mount Available Canon, Nikon, Sony
- Price (SRP) £349.99
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From ephotozine.com
Tamron SP AF 17-50mm f/2.8 XR LD Aspherical (IF) Di11 Lens, digital photography, photo equipment, SLR, DSLR, cameras, pictures
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The tiny and reasonably inexpensive 
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