jschella

Sorry, just saw this now. The problem is, if your image sensor is not at the proper backfocus distance, especially critical for telescopes with a built in corrector (like the EdgeHD or when you add one yourself, then you will not be able to achieve the best/roundest stars across the entire imaging plane. Hope that helps, Jason

Hi, I'm a little late to the party here, but I have the CEM120 (non-EC) version and would recommend it. I run at a focal length of 2100 mm (an EdgeHD 800 at F10) and guide using a ZWO-L (large prism) OAG with an asi174mm guide camera. My seeing is typically around 1.8-2.0". My guiding (PHD2) is almost always between 0.30-0.40" total rms. For me, I am now seeing limited for imaging, so even if I could guide better, I would not see it in the images. Therefore, I would be wasting money using encoders. Yes they can get you down to 0.2" rms but this has no impact for me (or I think anyone with similar or worse seeing conditions. The only I see to need encoders here would be to do unguided imaging. And the only real reason I see for that is if you can't fit an OAG/ONAG within the backfocus of your telescope. Jason

Hey Nick, I have a CEM120 on a skyshed pier. I purchased the adapter plate from Skyshed, so easy for me. I had a CGX mounted on it before and that adapter plate was not workable with the CEM120. Cost me about $170 canadian (shipping in). If you have an existing adapter plate for your current mount, if its flat on top (where the mount sits), you just need to drill 4 holes for the mount to bolt on to. Cheers, Jason