sigma 18-200mm F3.5-6.3 DC OS ?

[job38]

Anyone tried on of these boys yet?

[beano500]

Not tried it, but I assume AF sensor (depending on what body) could really start to struggle below f5.6 - so I'd see if you can't try one out before buying.

(By all accounts Nikon's version of 18-200 isn't bad, but some reviews can't tell the difference:

www.nikonians.org/dcforum/DCForumID17/15469.html#4

www.nikonians.org/dcforum/DCForumID17/15139.html#0)

[VxDuncan]

I haven't tried it, but had the little brother - the 18-125. Have to say it was a pile of tripe, and ruined a lot of my photos. Just wasn't sharp, suffered chronic CA and was really noisy. Unless sigma has improved the motors and optics I wouldn't go near one of their mega zooms ever again. Personally I would touch any Sigma that wasn't EX again. Too many once -in a life time shots have been ruined for me by Chromatic Abberation or soft optics.

[RobDickinson]

I assume like other sigmas it'll try fool cameras into thnking it only goes to f5.6?

I doubt this will be much different to the tamron equivelant.

[sidaorb]

I'm with Duncan on this one, if its Sigma and it hasn't got EX on it walk away. Tend to be poor quality at the top end of the zoom. Had a 28-200 as a cheapy and thats what it was!

Carl