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#1 tbaehnck



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  • LocationNorderstedt, Germany

Posted 13 September 2016 - 02:06 PM

Hi all,


one question about focusing with sequenz. Are the units for the offset really in mm? And in the autofocus menu also?

I asked beause there is no chance to tell sequenz the stepsize of my hires stepper? So how sequenz will do know how many steps are necessary i.e. 2mm. ?


Or are you using all the offests in maxmDL?


Thanks and best regards


#2 lukepower



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  • LocationDolomites, Italy

Posted 13 September 2016 - 03:44 PM


sequence doesn't know :)

It's that easy. I dunno if it calculates it using the focuser driver or if it is a remainder of times when Sequence only supported the ASA focusers, though...

Lukas Demetz
Astro Dolomites Observatory, Skygems Network
Santa Cristina Valgardena, Italy
20" Cassegrain-Newton on ASA DDM85XL

#3 MarkS



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Posted 14 September 2016 - 01:50 AM

Hi Thomas,


I ran into the same problem with the Microtouch/FocusMax set-up on my refractor.


I found that it was necessary to trick Sequence into moving the focus by the right distances.

I measured how many steps the Microtouch needed to move 1mm. In my case it moved 72mm for 20,000 steps, ie 0.36mm per 100steps.

I then established that Sequence thinks 100 Microtouch steps is 0.1mm, so that I had to set the coarse and fine AF steps in Sequence to 1/3.6 times the actual value I wanted.


Using this as a starting point, I then altered the steps until I got the right HFD shifts for coarse and fine shifts.


This has given satisfactory AF performance during Sequence runs.


With the focus offsets, I just used what Sequence AF measured, and it worked OK.


Hope this helps!



Edited by MarkS, 14 September 2016 - 01:58 AM.

#4 nakbrooks



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Posted 14 September 2016 - 07:31 AM

Excellent tip to add to the Wiki Mark !
Nigel Brooks
Stratis Observatory, Hautes Pyrénées, France.

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