Re: [Utah-astronomy] de-rotator (Cont.)

Computerized field de-rotators work because they are hooked into the rest of the drive system. The computer knows the exact alt-az coordinates of the scope, so it can feed the correct rotation rate to the de-rotator. BTW, meade also makes--or at least made--a derotator for their smaller LX200's. The only consumer installable drive system that has field de-rotator support that I know of is Mel Bartels' system. Which incedentally I will be installing on the new scope that I am making. (30" f/4.23 folded dob, if anyone wanted to know). Greg __________________________________________________ Do you Yahoo!? Yahoo! Tax Center - forms, calculators, tips, more http://taxes.yahoo.com/