Will the physical length of a lens affect its IS efficiency?

Started Aug 9, 2008 | Discussions thread
hbx2004
Veteran MemberPosts: 3,162
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Re: Will the physical length of a lens affect its IS efficiency?
In reply to Soo Yee Seong, Aug 9, 2008

Soo Yee Seong wrote:

Will the physical length of a lens affect its IS efficiency?
...
For example comparing the two lens 18-55 IS and 17-55 IS when both
are at same focal length 18mm with same F4 aperture. Does the longer
lens of 17-55 introduce more motion blur when shot without IS?

No, I think. IS gear isn't positioned on front or real lens, but somewere in the (optical) middle -there, where it's most effective for given lens assembly.

See: http://www.usa.canon.com/content/CanonINC/technology/index3.html

For further understanding, I recommend "Canon EF Lens Work III" reading -many things explained there.

Bogdan
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http://freeweb.siol.net/hrastni3/

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