Over the summer I took the mirror out of my R200SS to wash it. I've done it before and it's always been fine. This time however, on using it the stars were horrid.
The first night, the were looking like this during focusing;
So I took everything apart, checked the clips weren't pressing on the primary (they were), recollimated and tried again. I got this (single frame);
Better, but not right, so I tried again (another single frame) and made it worse
To me, the last image looks like I've gone too far with the backspacing, but it's exactly the same setup as I've used many times in the past. The top left and the top centre look odd so I wondered about tilt and, with no particular logic to back it up, I took a couple of flat frames.
This is with everything set up as above
and this is with the camera rotated 90º
I used a Rigel align thing to check the secondary placement and then a combination of barlowed laser and cheshire eyepiece to check everything. I've done it many times before and always had decent results.
Any ideas?!
The first night, the were looking like this during focusing;
So I took everything apart, checked the clips weren't pressing on the primary (they were), recollimated and tried again. I got this (single frame);
Better, but not right, so I tried again (another single frame) and made it worse
To me, the last image looks like I've gone too far with the backspacing, but it's exactly the same setup as I've used many times in the past. The top left and the top centre look odd so I wondered about tilt and, with no particular logic to back it up, I took a couple of flat frames.
This is with everything set up as above
and this is with the camera rotated 90º
I used a Rigel align thing to check the secondary placement and then a combination of barlowed laser and cheshire eyepiece to check everything. I've done it many times before and always had decent results.
Any ideas?!
