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#1 tbaehnck

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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

Thomas



#2 lukepower

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Posted 13 September 2016 - 03:44 PM

Thomas,

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
------------
www.skygemsobservatories.com
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!

 

Mark


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.
http://www.facebook.com/stratisobservatory




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