For camera:

Nikon

Other - The largest diaphragm opening of a lens delivers the shallowest depth of field. This 17-50mm has a maximum aperture of F/2.8. This opening can be used to make subjects stand out against a blurred background. Only fast lenses bring out this effect fully, especially with APS-C sized sensors where the depth of field is rather high due to geometrical reasons. Fast lenses like this 17-50mm help to fully maximize the creative possibilities of photography.
Large Image - http://s3.acme.lt/products/079540/photos/large/1.jpg
Medium Image - http://s3.acme.lt/products/079540/photos/medium/1.jpg
Small Image - http://s3.acme.lt/products/079540/photos/small/1.png
Vendor's URL - http://www.tamron.eu/en/lenses/overview/single/product/sp-af-17-50mm-f28-xr-di-ii-ld-aspherical-if-1.html?tx_keproducts_pi6[cam]=&tx_keproducts_pi6[vc]=false&tx_keproducts_pi6[sp]=false
Name - Tamron SP AF 17-50mm F/2,8 XR Di II LD ASL [IF] for Nikon, Groups-Elements: 13-16, Angle of view: 78-31, Optical Construction: rotation, 7 blades, Min aperture 32, Max Magnification Ratio: 1:4.5, Filter size: 67mm, Weight: 430g
Warranty - 12 months
GrossWeight - 0.66 kg