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Hi Geoff
When I first got my EQ5 I also fiddled around with the DEC backlash - adjusting the gears etc and then finding by observation the minimum backlash setting in Synscan to just eliminate the problem (which incidentally was much less than the default value of 10arcmin of Synscan manual). I did this with the intention that it would improve my DEC guiding. However, I discovered that when used in conjuction with my PHD guiding software that the auto backlash seemed to upset PHD. So I have now switched it off and PHD guiding works very well. Incidentally I set the polar alignment so that there is always a slow drift to the North so that the guiding does not have to contend with the backlash region. Also I have the Dec Algorithm in PHD set at Resist Switching as I found that the Lowpass Filter mode caused occasional large excursions in the PHD guiding.
Cheers Peter
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