hi all after problems with my oag just thought i would start a new topic,is there a difference in the quality of oag(ie do some let more star light through to the camera) and what is a good sensitive camera to use (better than a qhy5 ii) i need some advice desperately
oag quality and camera senitivity
Posted 20 April 2019 - 07:32 PM
The larger OAG like the celestron ones claim to not only having a prism but also mirrored surface on the back of the prism to increase transmission. Don't know if that actually makes a difference but the celestron prism is one of the biggest and combined with the large sensor in the 174 means a larger field of view and higher likelihood of finding a guide star.
Posted 20 April 2019 - 09:30 PM
Posted 20 April 2019 - 09:42 PM
One thing to note is that PHD2 dev have said before that ideally your guide camera image scale should be below 0.5 arc-sec per pixel as their algorithms are not designed for smaller scale.