I use the Orion thin off axis guider, and it does not interfere with the sensor of either of my cameras. Normally I arrange it so that the guider is directly underneath the main camera body. The biggest issue with an OAG is having the two cameras in parallax, after trying multiple times to gain focus while looking at the output images, I decided to just sit down and do the math and work it out with a set of calipers. This got me really close then the fine tuning was easier. One lesson I learned was to make notations, and mark the focus extensions to facilitate the next imaging session.

I also have a couple of refractors to use as guide scopes, but with my AT6RC it brings me over, what I think is appropriate, the load capacity to gain clean images. I recently have been trying to work out the intricacies of guiding. Last night was my first successful evening using all the equipment without any major hangups. I was able to get 5min subs without any trailing, sadly I had forgotten to list the drive in which to save the images so all 6 hours were lost. Tonight I am trying different lengths of exposures, of up to 15 minutes, and if it works ok I will have better hope of using my narrowband filters with my D800e without having to remove its hot filter.

One tip is program your PEC so that your guider does not have to fight your inherent periodic error. With my AVX my average PE was 12.6. I took 6 recording of my index's PE, averaged them together then reloaded them back into the hand controller. Now I just have to remember to hit the playback option before imaging.

Hopefully I'll have images to share tomorrow.
Matthew