The Tamron 70-200 f2.8 lens has good sharpness and nice bohek. The autofocus is not amazingly fast but is adequate for most everyday situations. Below are some sample shots produced with this lens and the Nikon D90. Exif data can be found by clicking on the images for it to open in flickr. From there you can you can select Actions and then View Exif.
This shot was taken straight down. Ambient light. The subjects are made from sugar. This was very close to a big open window. I used some white cloth draped on the window to further diffuse the light.
Over here i used a mixture of ambient red light that was coming from a flare on the ground as well as a LP160 flash way back on 1/64th power to just outline the body. It was taken outside on diwali night so lights from houses and fireworks also helped to illuminate. This was at ISO3200.
For the fireworks shot the lens was simply focused to infinity and triggered with a remote. F32 at ISO200. 10 sec exposure.
Pingback: Buy Telephoto Lens Best Prices