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Old 14-10-2007, 09:33 AM
Ingo
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Vr & Is

I'm getting a 70-200 F2.8 VR in a couple of days and I'm wondering if I should use the Vibration Reduction in the lens when doing photos of the moon & M42.
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Old 14-10-2007, 09:38 AM
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Astroman (Andrew Wall)
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If your holding the lens by hand, it would help, but if your on a tripod or eq-mount I cannot see any benefit in using the vibration reduction. With the lower light levels it may confuse the lens/camera and actually make things worse.
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Old 14-10-2007, 11:36 AM
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ving (David)
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so now thats answered...

if you find you dont like the lens feel free to give it to me
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Old 14-10-2007, 12:36 PM
Ingo
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Quote:
Originally Posted by Astroman View Post
If your holding the lens by hand, it would help, but if your on a tripod or eq-mount I cannot see any benefit in using the vibration reduction. With the lower light levels it may confuse the lens/camera and actually make things worse.
What about mirror slap? Wouldn't it reduce it? I don't know if VR or IS is that accurate.
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Old 14-10-2007, 01:05 PM
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I recall reading somewhere (?) that for tripod mounted photo’s of stationary objects, it is best to switch off any IS or VR capability, otherwise it can lead to unwanted image artefacts such as CA.

Cheers

Dennis
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Old 14-10-2007, 03:00 PM
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acropolite (Phil)
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Ditto what Dennis said, it's recommended practice to turn off any IS when using a tripod.
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Old 14-10-2007, 03:48 PM
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I cannot see VR or IS being that sensitive to mirror slap. But if you have mirror flip up then use it for astrophotography. If you don't then you will have to make do. CA? maybe, I was thinking more image shift during the exposures creating a somewhat blurry image or making it look as though a double exposure had been taken. If would only be slight but the image would look soft and you would think the optics were rubbish in an otherwise expensive lens.
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Old 14-10-2007, 04:04 PM
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A quick note, on a Canon lens of the same basic design, if I (handheld) point it at the zenith with image stabilisation enabled, it sometimes goes nuts. The motion sensors do not handle that one particular orientation well. YMMV.

That said, a full aperture solar filter on the lens & it works very, very well handheld.
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Old 14-10-2007, 04:29 PM
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Ingo, Andrew is spot on, for astronomy, and tripod, or mounted lenses it serves no purpose to have the VR, or for that matter IS in Canon lenses turned on.

I have a Canon 300mm F/2.8 and it dosen't have IS at all, and it is just brilliant that way.

Leon
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Old 14-10-2007, 10:15 PM
Benny L (Ben)
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Quote:
Originally Posted by acropolite View Post
Ditto what Dennis said, it's recommended practice to turn off any IS when using a tripod.
it takes up batttery power for nothing so i would switch it off...
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