[Robh (Rob)]

Originally Posted by toryglen-boy

Hi Rob

Yeah, its worth it. I use it on a 12" dob, and it makes quite a difference with lower power, wide field eye pieces, although the only two points i would make are.

1. its a pain in the niagras to get the spacings right, and getting used to it can be like working out a Chinese logic puzzle.

2. Its best used with really good quality eyepieces, as quite alot of the bad viewing can be caused by defects in eyepiece itself, and not really down to coma. that said, its a handy piece of kit, and with me getting into imaging, and eyeing up a 20" F4 dob, its gonna be an even handier thing to have around.

Duncan,
Thanks for the advice.
Regards, Rob.