From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


There is one difference between a CS and a C mount lens - the distance
between the focal plane and the mounting plane.  The CS lens is closer to
the focal plane by about 1/8" or so (from memory of handling the
adapter). This is about the right amount to make a short focus problem like
you are having.  The adapter for the C mount lens is normally screwed into
the CS mount and that accepts the threads for the C mount lens. Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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