Thom 16-85VR and 18-105 DX review is up

Started Feb 16, 2009 | Discussions thread
Thom Hogan Forum Pro • Posts: 13,659
Re: VR affects bokeh?

sveto wrote:

Could you please elaborate with a few words about this phenomena?

Think frequency. The discrete movement of the VR mechanism tops out at about 1/500 (that's the frequency of response, not a shutter speed). Most people seem to think that VR is this super fast thing that would have no optical impact, but as pretty much any sports photographer will tell you, we turn off VR beyond 1/500 shutter speeds because of the frequency issue. But even below 1/500 the mechanism can cause some small jitterish movement in a longer shutter speed (jitter is a real term used to measure small fluttering response off the expected line). And I happen to think that this jitter shows up in certain bokeh situations (not all mind you, but often enough to be slightly less attractive).

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Thom Hogan
author, Complete Guides to Nikon bodies (19 and counting)
http://www.bythom.com

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