- ASIAir Pro
Simple and Solid
Few adjustments and screws make it a solid performer. This replace my Orion Thin OAG which was flimsy, had way too many screws.
Works amazing once you get the correct back focus and prism height. Currently using with asi174mm mini and have no trouble finding guide stars.
Solved all my Guiding Issues
My previous guiding setup had a separate guidescope, but I could never manage to get round stars. I had great guiding numbers but terrible stars. Whether it be differential flexure, focuser movement, or whatever, it wasn't working. The ZWO OAG fixed all this on the first night. I was able to get everything attached right away, and it only took a little fiddling to get the optical train completely set up. I see no issues with the prism wobbling; I'm not sure what's happening with other people. There are two set screws and two alan screws. I have all of them tight and there is absolutely no movement anywhere. I'm getting the same guiding numbers as the guidescope, but now my stars are perfectly round regardless of exposure time. No more differential flexure! I can now take ~1 hour exposures with round stars at 1800mm focal length, which is completely overkill and completely awesome. The only negative is the field of view is limited, and I wouldn't expect a sensor much bigger than the ASI 120/290 to be beneficial because the outer edges will be too vignetted. I haven't had a problem with finding guide stars using an ASI 290mm, but having a high sensitivity camera definitely is a must. Overall, I highly recommend this guider because it solved all my guiding issues!
Very good, tiny bit tough to get the focusing down but once it's dialed in, it's perfect.
I have 3 of these now
One on each scope setup.