Peter.M
11-05-2023, 10:51 AM
I am making some modifications to my truss scope, and will need to spend some time tuning the stars back to as good as I can.
Out of the box the focal plane of the GSO scopes is really distant from the tube walls. With my camera / OAG / corrector I was still using 60ish mm of spacers to achieve focus. With an 88mm secondary, this meant that none of the 100% rays were getting to the camera. I am testing out increasing the distance from the secondary to the primary with some spacers, which let me move the camera back closer to the scope.
The end result is I should have a brighter image, because I'm not throwing away precious mirror real estate (If I have to lift it onto the saddle, I want to be using it) and there will be less weight hanging off the side of the scope, at a shorter distance.
So far its looking pretty good, now I just have to tune the tilt again. This one is an hour of each NB filter without playing around too much with the tilt.
Cheers.
Out of the box the focal plane of the GSO scopes is really distant from the tube walls. With my camera / OAG / corrector I was still using 60ish mm of spacers to achieve focus. With an 88mm secondary, this meant that none of the 100% rays were getting to the camera. I am testing out increasing the distance from the secondary to the primary with some spacers, which let me move the camera back closer to the scope.
The end result is I should have a brighter image, because I'm not throwing away precious mirror real estate (If I have to lift it onto the saddle, I want to be using it) and there will be less weight hanging off the side of the scope, at a shorter distance.
So far its looking pretty good, now I just have to tune the tilt again. This one is an hour of each NB filter without playing around too much with the tilt.
Cheers.