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Hi Ken. Hmmmm.... ok, (I think). Let's see if I understand you correctly (remember, I know very little about the subject, practically). I assume the focuser is just a mechanism to which an eyepiece can be attached, and which is used to position the eyepiece wrt the focal point of the primary. Then, if an image sensor (DSLR) is to be positioned at that point, it is necessary that the mechanism (without any eyepiece attached) can be moved 'inwards' towards the tube sufficiently far for the focal point to be out 'in thin air'.
Not very technically expressed, I know, but is that the gist of it?
Roger
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