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Hi C
Typically, the tele extender optical train goes something like this:
Telescope focuser → tele extender + projection eyepiece → T2 ring → 35mm SLR camera.
The last time I did this, I used a 10mm eyepiece in the tele extender and on my ‘scopes, I had to wind the focuser out, rather than in, so I didn’t exhaust all my in-travel.
If your dad just put the tele extender tube in the optical train without a projection eyepiece, then it is highly likely he would run out of inward focus travel, as the tele extender is effectively eating up some 3 or 4 inches of inward travel.
Cheers
Dennis
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