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I've got both a T adaptor for prime focus and a Tele-extender for use with barlows and eyepieces. I tried using the Tele-extender with a 40mm eyepiece and got no where. I simply don't have enough experience yet! My first try at prime focus now that I have my wedge and pier set up, proved that I have a long way to go!! Focus out, over exposed, vibration problems because I left the formwork for my concrete block in place. Didn't think that would transmit vibration from the deck to the block but it does!!
I strongly suggest you start with prime focus and iron out your bugs at that, then move up. Pretty simple really. Magnify your target and magnify your bugs!
Just a suggestion from a total newbie, from what I'm going through,
Ken
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