"Snap Focus Ring" - what is it?

Started Jan 24, 2013 | Questions thread
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John.Laninga
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"Snap Focus Ring" - what is it?
Jan 24, 2013

I've been around photography for 50+ years but really don't know what a "snap focus ring" or even "snap focus" is.  It shows on the description of the Oly 17mm lens as having one.  Can somebody explain it to me please?

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