Summary: Here is the problem with mega zoom lenses. You will NEVER get a sharp image out of it. plus you need a ton of light to even use the thing. Do yourself a favor, get smaller range lenses. 70-200 and 24-70 if you need something wider then get that too. Do not buy.
Description should say it is not for full frame DSLR's
14 January 2013
Summary: Well, I just ordered this lens today from Amazon.com, based on the reviews here it sounded like a good lens for a decent price. The description of the lens sounds great. The problem is, the description of the lens on Amazon.com does not indicate that it is not for full-frame FX format cameras.
Summary: I purchased a Sigma 18-200 zoom lens and after a week of testing and comparisons I sent it back. Fortunately Amazon has a swift no quibble returns policy. Sigma's lens failed because the images were soft and focusing problematic. The lens also started to rattle.
Summary: I am a amateur and new to DLSR's however I bought this for My Nikon after reading numerous mixed reviews all over the internet. At £280 it was worth a look; considering the Nikon equivalent is £700! The recommendations suggest this takes a 72mm filter - it doesn't, its the newer 62mm version.
Summary: ich habe diese Ojectiv. Leider funktioniert es an der Canon EOS 760D nicht. Sehr lange Auslöseverzögerungen und Life-View geht überhaupt nicht. Dadurch ist es nicht brauchbar. An mehreren EOS 760 getestet. An meiner alten Canon EOS 550 funktioniert es normal. Grüße Christian