Re: Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1


Roland Christen
 

Look at the P-P values. That will tell you how much the sky is moving around by itself, and you don't want to try to correct for this with your guider. It's impossible really to chase this motion because by the time the guide software has read it, the star has bounded to another value. So the idea is to set the Min Move to be just a bit above this peak value (1/2 of the P-P).

How to calculate the Min Move? At 1x the mount moves 1.5 arc sec per 0.1 seconds of time. So a Min Move value of 0.1sec will ignore all sky motions less than 1.5 arc sec.

Rolando


-----Original Message-----
From: CurtisC via groups.io <calypte@...>
To: main@ap-gto.groups.io
Sent: Thu, Oct 15, 2020 1:01 pm
Subject: Re: [ap-gto] Crayford style focuser for Vario-Finder 10x60 ; 61x250 f/4.1

Thank you. 

Unrelated to the question about the Baader, I tried your suggestion of running a couple of minutes unguided to see how the DEC axis "bobbles."  I wasn't sure what numbers I should evaluate: RMS?  Numbers from the running readout?  Eyeball the lines on the graph?

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