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Sigma 18-200mm f/3.5-6.3 DC OS

I get CA with the OS version, but I think it is a little more focal length dependent...haven't really done much to check that though...
 
Hello,
I'm looking for a service manual (repair) for Sigma 18-200 mm lens.
Does anyone have these documents in electronic format?
Thanks!
 
I hope I'm not out of topic.
My (new) Sigma 18-200mm f/3.5-6.3 DC OS's zoom ring is stiffer when rotating around 50-80mm. Is it ok?(at least is annoying)
And the zoom lock should only lock at 18mm?

As with the sharpness, it is indeed verry sharp arround ~18-170mm, and looses it's sharpness a bit after ~170mm.
 

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Hi copilus,
right,the lock switch only works at 18mm.
The slight resistance you feel around 80mm is normal with a new lens.
It will disappear after a while of use.
My 18-200 seems to be sharp even @200mm
View attachment 1677

Regards
Uwe
 

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Hi All,

The 18-200 performs really well all over its stretch. It sounds unbelievable, but it is true.

As mentioned there is a slight weakness around 35mm. F.4.5 is max aperture. Then you do not reach absolute sharpness up to the very edges.

Just slow down aperture to 5.6 - 6.3 and the problem is fixed for the very few scenes that require perfect sharpness up to the very edges of your picture.

The long 200mm end is finest .... definately! Uwe shows it above .... have another look.

The OS is a dream!

View attachment 1678

See you with nice pictures

Klaus
 

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