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Originally Posted by slice of heaven
The r&p focusers on both my Parks newts have a screw in extension tube between the eyepiece holder and the focuser barrel.
Is the above statement the reason for this?
I've never known why their there. The Parks are supposedly designed for imaging ,given their age I'd say for film though not ccd.
Can anyone shed some light?
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Shouldn't make a difference I would think - AFAIK the CCD and film lie at the same distance in from the front of the camera, so the focal plane required should be the same (this is obviously for SLR's).... there is the crop factor with most DSLRs, due to the CCD sensor being smaller than a 35mm negative....
Does this extension tube have lenses in it? If it did I would guess it acts like the barlow....