NMBob discovered Visual back will fit on secondary of Fastar compatible C6 in another thread and called it FreeStar. This thread is to report results trying this F2 setup.
I had several problems, many of my own doing, and location, that need to be sorted out. I'm in a near white zone and conditions are not good tonight for seeing or transparency. I get a lot of back scatter from the light dome in these conditions. What did I find out?
o Usually I run x128 exposure on my LN300 camera, but with FreeStar I had to run x16. It seems to be eight times brighter!
o I could not use a bright star for focus as making it smaller caused dim stars to disappear. Finally used dim stars for focus. Can't use batinov mask.
o Bright stars have a halo and you can see cables in halo. This maybe due to streetlight getting in. Dew shield can not be installed to block streetlight.
o I could not get SharpCap to stack, so tried brief non-align stack.
o Need to work things out at a darker locatoin, learn how to focus, keep streetlight out, and get SharpCap to stack.
Bottom line, this will take more work to see how useful it can be. I believe 224 camera would be more capable at this wide field of view. Anyone do better than this? Shouldn't take much effort.
Here is poor first attempt on M51. Using x8 exposure (.3sec) and stacked for 27seconds un-aligned.
It was so bright, I tried turning off AGC and tried x256 exposure. Not bright enough to stack. Here is non-stacked single exposure. You can see cables in bright star halo. M51 is at top of frame. I wonder if stars are one pixel and SharpCap minimum 2 pixel limit causes failure to recognize stars?
M13 Using x8 exposure and stacked 5 seconds un-aligned.
Edited by CharlesC, 20 April 2017 - 12:22 AM.