At 9:18 PM -0400 2005.01.28, John Hudson wrote:
>
>To test for vignetting, mount the filter and then the hood and then look
>through the viewfinder with the end of a finger just protruding over the
>edge of the hood. The slightest darkening in the corners of the image
>through the viewfinder indicates vignetting.
>
Another way (courtesy Moose, April 2003) is described here:
http://lists.tako.de/html/Olympus-OM/2003-04/msg01740.html
I had just bookmarked this a couple of days ago, for use in testing the
usefulness of a 24/2 hood on a 28-48/4!
regards
Andrew
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