Didn't know whether to put this in Equipment or Refractor's forum, figure somebody with refractor might had the same problem.
I have a perplexing problem trying to reach 55 mm of back focus with my telescope. As you can see in the picture, between the MAIN camera sensor and the back of the Orion reducer/flattener the distance is 52 mm. With that set up it leaves approximately 3 mm of space before the focus is all the way up against the tube. My stars are little elongated in the corners so I know I need to get that up to 55 mm of backspace. I also have a UV/IR filter inside the reducer/flattener so I really probably need an extra .5 mm. When I put 3 mm worth of spacing in between the sensor and flattener, to bring it to 55 mm, focuser is all the way in the draw tube with no more movement possible. And the stars are just quite not in focus. If the focuser tube was a few millimeters longer, the stars would be in focus. I do have a added adapter between the telescope and the reducer/flattener that adds 1 mm. It is the new Orion flattener/reducer made for this telescope. However, I had to add the adapter because the reducer/flattener only fits the models made in the last year. The reducer/flattener requires 55 mm of backspace. I really have no solution for this, kind perplexing that the focus or would be all the way in the tube with such a standard set up as this. Any ideas or suggestions?
Any help or ideas would be very much appreciated.
Edited by davidmalanick, 20 June 2021 - 09:06 PM.