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oag
Thanks JohhHello Chris
On my C9i am using the celestron OAG due to its large prism and the ASI174mm mini guide camera. Works a treat and takes advantage of the big prism.
This seemed to be the advice always given for scopes of that focal length.
I also have the 120mm but use it on my small SVBONY SV555 scope and that always finds guiding stars without an issue, but i have not tried it with the OAG, and not sure i will bother to be perfectly honest.
Reason i went with the celestron over something like the ZWO OAG-L and some of the others was that it can be screwed onto cameras rather then bolted on, and you can rotate the main camera or the guide camera individually. With something like the ZWO OAG-L you would need to also add a rotator.
The disadvantage of the celestron OAG is its size, its 29mm thick, so if backspacing is tight, it may not work for you
On my C9i am using the celestron OAG due to its large prism and the ASI174mm mini guide camera. Works a treat and takes advantage of the big prism.
This seemed to be the advice always given for scopes of that focal length.
I also have the 120mm but use it on my small SVBONY SV555 scope and that always finds guiding stars without an issue, but i have not tried it with the OAG, and not sure i will bother to be perfectly honest.
Reason i went with the celestron over something like the ZWO OAG-L and some of the others was that it can be screwed onto cameras rather then bolted on, and you can rotate the main camera or the guide camera individually. With something like the ZWO OAG-L you would need to also add a rotator.
The disadvantage of the celestron OAG is its size, its 29mm thick, so if backspacing is tight, it may not work for you oag and camera, celestron and the 174
Chris
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