Hi, I am having problems with calculating the back focus for my OAG. I have an Celetron Edge HD8 with 0.7 focal reducer. Setup as follows: Telescope Reducer Celestron 50mm extender T2 entender 11mm T2-T2 2mm ZWO OAG 16.5mm Filter 0.7mm ZWO EFW7 20mm ZWO ASI1600 6.5mm The ASI1600 is in focus but I can not get my LoadStar 2 into focus and I am getting very confused with the back focus calculations. Could anyone please help with this.
Thanks for response Sam, but the problem is now solved. The LodeStar chip was placed very deep in the housing so I added a spacer between the Filter Wheel and the OAG to increase distance. I also reduced spacers in front of the OAG and got good focus for both cameras.
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