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Old 13-05-2011, 08:55 PM
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dugnsuz (Doug)
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Join Date: Aug 2005
Location: Hahndorf, South Australia
Posts: 4,261
Hi Chris - I've been using the ebay step down rings to stop down both my 70-200 f4 and 400mm lenses. Seem to work well, although I haven't done any thorough tests with and without the rings. I reckon they're the easiest way to achieve what you want at very little cost.
Doug
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