Pictures tomorrow.
Part 1 Installation.
Installation is as per the instructions and pretty easy. Simply place the scope in a position where you can release the RA clutch and not have the scope crash into something. I had mine resting against the mount. Then unbolt the old worm, remove the part of the Oldham coupling and refit the new worm. Adjust the Backlash in the RA axis to a couple of mm movement of the end of the CW shaft. Mine's a bit tighter than this, so I may back it off a bit. The instructions say that the worm is pregreased, I couldn't see anything on it, so I whacked a bit of bearing grease on it.
My clutches are really hard to get tight enough to hold everything when there's no camera attached, so I had to use a lot of force to undo the RA, in doing so I managed to stuff up my polar alignment.
So after I had installed the Ovision I had to drift align again.
- tried out the drift align wizard in PemPro, it has some problems, can't seem to lock onto a star.
- used Startarg instead, which I use my webcam for, so the SBig had to come out, refocus etc.
- Drift aligned the azimuth OK, but not perfect.
Started PemPro (again screenshots to come tomorrow), ran the first acquisition without PEC on to get the native PE of the worm, looked OK except for some drift from the imperfect polar alignment. Curves overlayed pretty well. Analysis showed the 76 second error has gone.
Programmed the mount with the new PEC and acquired another four worms worth of data. Tried to use the refine part of Pempro, things seemed to get worse, tried subtracting one curve from the other, still rubbish. Did another couple of manipulations of the PE curves, eventually I have it down to +/- about 3.5", P-P 7".
Tried to run the align wizard again, better, but still having difficulty locking onto the stars.
First impressions of the worm, worth every cent. If I can work out how to get Pempro to work properly (probably operator errors), then I think I should be able to refine the PE down to <5" P-P, which should be good enough for unguided exposures at moderate focal length.
Test shots tomorrow night hopefully.
Cheers
Stuart