I just changed my QHY 5L ii for a ZWO ASI290MINI guide camera. I have a ZWO thin OAG in front of my ZWO 071 camera with a 15 mm spacer between. The QHY just reached focus nearly at the bottom of the tube.
I find I cant each focus with the ASI290 no matter where I put it in the tube and suspect I may need more spacers between the camera and the filter wheel to enable focus higher in the tube, does that sound right?
Anyone have this working and if so what spacer are you using so I can order if necessary.
Edit. Looks like I need a 20 mm spacer so I am 5 mm short of focus right now. Can anyone confirm this.
Edited by telfish, 17 May 2019 - 11:39 PM.