Go Back   The TrekEarth Forums >


Thread Tools
Old 10-14-2008, 07:14 PM
Rooster_kool's Avatar
Rooster_kool Rooster_kool is offline
TE Newbie
Thread Starter
Join Date: Apr 2007
Posts: 88
Default Len Suggestion.

Wat is different and advantage between Sigma 18-200mm f/3.5-6.3 AF DC II ($170) and Sigma AF 18-200mm f/3.5-6.3 DC OS (Optical Stabilizer) Zoom Lens ($416). It's kinda the same but different. Y it different ? I have plan to buy it.
Reply With Quote
Old 10-15-2008, 01:17 PM
AdrianW's Avatar
AdrianW AdrianW is offline
Join Date: Mar 2003
Posts: 1,596
Default Re: Len Suggestion.

The OS version has an optical image stabilizer built-in. At it's simplest that means that if you're handholding, the number of sharp shots you get will be higher if the subject isn't moving.

The two lenses have different internal designs, the result is that the OS version should give somewhat sharper results most of the time.

Finally, if you're a Nikon user, the OS version has HSM, which means it should focus more quickly and quietly on a Nikon body. Check that your camera supports the various focussing/metering modes of whichever lens you choose.

Advantages of the non-OS version: It's cheaper, uses smaller filters, and it weighs less.

Personally, of the two, if finances permit I'd choose the OS version particularly if you're a Nikon user whose camera supports HSM fully.

It's less clear cut if you're a Pentax user with in-body stabilization though, I'd probably choose the cheaper one for the Pentax, as the OS is redundant.

Obviously if you always shoot from a tripod, OS is less of an advantage; so I might go for the cheaper lens there as well.
Reply With Quote
Old 10-20-2008, 10:35 AM
Luko's Avatar
Luko Luko is offline
TE Expert
Join Date: Apr 2003
Posts: 1,969
Default Re: Len Suggestion.

Hi Adrian,
As you are sometimes interested in setting up field tests upon various technical subjects, have you ever drilled into the "IS/VR at high shutter speed" issue.

It seems there is a growing buzz with it : Is IS/OS/VR functionnality REALLY decreasing sharpness when shooting at normal or high shutter speed.... and btw, what is the limit in terms of shutter speed above which IS improves sharpness?

Reply With Quote
Old 11-04-2008, 10:16 PM
AdrianW's Avatar
AdrianW AdrianW is offline
Join Date: Mar 2003
Posts: 1,596
Default Re: Len Suggestion.

That's a very interesting question Luko.

If I get some time, I'll look into that and get back to you via the messaging system!
Reply With Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT. The time now is 10:00 AM.

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.