Sigma 170-500mm f/5-6.3 APO RF

looks to me slow but great and have sharp image , I was pay for canon sigma $1200 paint go off and dust go in ? but this older lens looks to me have all and is working fine on my sony A100

A great tele with crystal sharp image and beautiful color, if the subject is not moving. Basically this is a poor man's tele that happens to have great optics, yes, the optics is fantastic, but not much else.

I just bought the lens well used from a private seller at £230 (around $378 at current exchange) and tried tens shot with my Canon 20D. The photos at 170mm is quite good while 500mm is well acceptable. I picked a pine branch around 15m away at F76.3...

My experience has been a bit different than most others here, as I find this lens to produce very sharp images. I use it on a Nikon D70, and shoot RAW files. I've shot mostly in the focal length range of 400mm to 500mm, still good and sharp.

This is a good lens for what it is - a "consumer zoom". You would have to spend a lot more money to get significantly better image quality such as provided by a Canon L zoom such as the 100-400 L. It can be hand held with an appropriately high shutter...

Useless lens. This is my second attempt to "save" money on a non-nikon lens and it has been a complete waste. I have shot with this lens on a tripod, mirror lock-up and remote trigger and still can not get an image I would even consider offering for sale.

I've been dissapointed with this lens from the time I've spent going from amateur beginner photographer to semi-pro/expert. I bought it a few months after my first SLR: a film Canon Rebel 2000 (EOS 300)

This lens has been a big disappointment. I have owned this lens for 5 years and have yet to take a photo that I would consider sharp. Even stopped down, tripod mounted, mirror locked up with cable release still will not produce a sharp image. I would...

If you are expecting Sharp Clear crisp images then this is not the lens for you. It is somewhat soft throughout the zoom range but is still sharp enough to not be classified junk. Its clearly what you get for what you paided, a okay Super Telephoto for...

You probably want find anotther 500mm that works was well for the price, it works well for all the limitations you have read in other reviews. I have found a tripod is mandatory for use with this lens, a good tripod, heavy. It has lens creep which...