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I own an E-210 with helical focuser, have used it quite often with SBIG ccd
cameras.
I have zero problems obtaining focus and zero problems with framing any
object
The ring closest to the tube is camera rotator ring with lock, the next
ring is the actual focuser travel lock.....
I typically keep the cam rotator lock loose while focusing, when i
get focused, lock the focus ring, and find that i can rotate the camera to any
desired angle and lock it still maintianing focus.
Bruce K
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