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Hi Mark,
yes, possibly the biggest reason is the loss of light. OK it is nice to use both, but if the object is dim I reckon the view is better with the single eyepiece.
Hey great idea from Mark though, this would allow you to move the mirror, and not damage the tube. Even if you made a blanking disk, and used the existing holes, then mounted the mirror cell onto this, thus bringing it forward (I think it needs to go forward as well).
Gary
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