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Appologies, I'm using a Celestron 9.25 with focal reducer and canon 20D. Thanks for the feedback, it seems as though autoguiding through an OAG using guidedog may prove very difficult.
The problem that I'm faced with, as I'm sure most have experienced, is inaccurate polar alignment. I'm quite new to astrophotography and have realised that even though my polar alignment is quite good, photos in excess of 1 min show blurring as a result of tracking errors. I've found that obtaining fairly presise alignment can be achieved with consecutive exposures and moving the mount. Drifts in the wrong direction are clearly visible.
I discovered that there was quite a bit of Dec backlash so I fixed that by adjusting the worm gear mesh which resulted in backlash being very small. The same was done to the RA; however, initial backlash was not as great as was present in the Dec axis.
Should I consider a more upmarket autoguider, such as SBIGXXXX ?
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