[APML] Backlash query

["I.J Jordan" <Ian@sun-house.demon.co.uk>]

Hi Everyone

I was reading a few day ago a short thread regarding the backlash in Vixen
drives compared with the drives with the Skysensor 2000.It raised a question
in my mind that someone may be kind enough to answer for me.
The question being:at what point does backlash become a problem.I am
wondering because although I would aspire to create images like I see on the
various websites belonging to members of the mailing list,I know that I have
to be realistic and say that it would be a long while before I could afford
autoguiders big heavy mounts etc,so what I am interested in finding out
given that I have a "fast" scope (10" f4.8) would backlash become a problem
in for example a number of short exposures (all things being equal,and
ignoring for the moment all the other problems that can crop up),of say
15-20 minutes and stacked in the computer.My gut feelings tell me that
perhaps it would only be a problem if the OTA crosses to the other side of
the mount during the exposure,but I will certainly stand correcting on that.

Thanks for any thoughts.Clear skies

Ian & Linda Jordan.



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