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I am thinking of adding a rotator to my C11 similar to my RedCat91 WIFD in which I use a Pegasus Falcon2 rotator. I know it is very difficult to see the C11 optical train with all the cables, but I would think the rotator should be installed in front of the OAG, so it is: Camera - FW - OAG - Rotator - scope, and using spacers to get me to the 147.05 +/- mm backfocus. I will have enough clearance so that the rotating OAG guide camera will not bump into the piggybacked RedCat. Of course, I will have to rearrange the cables, which is easier said than done. Am I missing any obstacles/steps? I'm still contemplating whether a rotator is even worth it for this setup as I mostly image small PN objects in which rotation really isn't necessary. And while you can manually rotate the OAG, that isn't an option for me with my scope way up in the observatory. I'd appreciate any feedback from experienced users. Bruce   |
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I threw the ZWO CAA onto my C11 but the OAG was hitting the EAF as it was rotating so I removed it. There are other mounting options for the EAF but I haven’t tried it yet. I should add I am using the .63 reducer from starizona so that might pull me forward a bit from the back of the scope compared to you. food for thought! Good luck! |
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Thanks for the reply and I am glad you brought that up. That is not an issue for me as I forgot to mention that my autofocus is the Optec SMFS on the front of the scope.
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I am using a Primalucelab Essato-Arco (Focuser-rotator) combination (not even the Low profile ones) on C11 with ZWO OAG-ZWO 7 EFW-ZWO2600MM pro. It's way beyond the stated back-focus..., but I haven't had any problem with star-shapes. Might be different with a full frame sensor. One thing to note is that the OAG's camera attachment cylinder will hit the rotator. However, an easy fix is to restrict rotation to 180 degrees. Easily configurable in NINA (and I am sure other software)
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I use a Moonlite Litecrawler with the ZWO OAG-L and a 6200MM. Backfocus is spot on, no collision issues, and no mirror flop. I put the Litecrawler in the center of its travel (which is what I used to calculate adapter sizes to reach backfocus–I think my Litecrawler-to-OAG adapter is 23mm if I recall correctly), get rough focus with the Celestron focus knob, and then lock down the mirror. I haven't touched the Celestron focus knob in three years. I set the rotator limits to 190 degrees each direction in the Moonlite driver (I believe that's the default), and now I rotate with impunity. I couldn't do without rotation–even at 2800mm. To me, it's essential for framing, even with small objects.
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Timothy Martin: Hey Tim- thanks. Sounds like you have a nice setup and I know others have swapped out the Celestron OAG for the ZWO OAG-L for easier connections. I'll be sticking with the Optec SMFS as I think it is the best focuser for the C11 and no need to mess with the available backfocus space. Like you, I have had the Celestron primary mirror "locked" down now for 6+ years. I'm still grappling with the need for the rotator for framing with small objects, but thanks for the food for thought. |
