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I used a Lumicon 2" Easy Guider with my Megrez 102, guiding with my DBK31 (quite a bit less sensitive than the DMK21) with good results... It definitely sorted out flexture problems I was having with separate guide scope setups.. and made overall setup time a lot lower, easier to balance, less weight on the mount with more accurate tracking as a result..
For focusing, as Darrell said, it can be tricky.. but what I did, was focus the imaging camera up, then by adding a 2.5cm extension tube (barlow without the lens) the guide camera was VERY close to focus, I then pulled the guide camera out 1mm at a time untill best focus was achieved, once it looked good I scribed a line on the cameras nose piece with a sharp knife, so that next time I could simply slot the camera in and tighten the set screws when the scribed line was at the edge of the extension tube's barrel.. This made overall focusing and setup time shorter again...
Best of luck with it, and remember, in the future you can always move to a more sensitive guide camera... The DMK will work well, and things can only get better from there....
Alex.
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