I had the same on the 12 inch wont go in far enough... I think I managed with a 3x or a 2x barlow... I have just discovered the same problem when I try to use colour filters on may main capture scope as 150sn... glad I found out before I bought a HA filter.
You may find just holding the camera at the EP may do it for you.. My first shots were of the Moon holding a litle 2 meg family camera at the EP...I have seen folk get ohotos of the Moon with phones that have a camera.
So the good news is its the set up not you... good luck with the adventure.
alex
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