Hi
Thank you for the reply.
In order to find out if my mount has a mechanical problem I performed another test last night.
My setup last night:
- Vixen ED81s f/5.2
- SBIG ST2000xm dual chip camera
- Skywatcher HEQ5 synscan pro mount
Autoguiding was performed via ST4 with second chip of SBIG ST2000xm like previous time.
As you can see from previous MaximDL guiding graph for test 3 with VC200L I have these values
RA RMS error 0.786, DEC RMS error 0.934
After performing star drift method for polar alignment, I have managed to reduce these values to
RA RMS error 0.042, DEC RMS error 0.191
So as you can see the guiding error is reduced in RA by 94.65% and in DEC by 79.55% !!!!!!!!!!!!!!!!!!
After that, I pointed the telescope low to the East and took two exposures of 15 and 25 minutes of Deneb.
In both images the stars were pretty round.
This proves that my mount has no mechanical problem.
I will need to repeat this test with VC200L loaded on the mount, after performing the star drift method for polar alignment.
This last test will provide the answer if mispolar alignment was the reason for getting elongated stars...
You can find attached my results
http://www.albireo.gr/tmp/logs.rar