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INDI Library v1.8.1 Released (09 Sep 2019)

Monthly maintenance release INDI v1.8.1

Focus on roundness

3 months 1 week ago 3 months 1 week ago by ecloud.
ecloud
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Focus on roundness #40813
The modern newton style telescope uses off-axis secondary mirror which could make the unfocused spot (a tiny ellipse) show the minimum HFR.
So the HFR could not represent the correct focus spot.
In my F4 Mak-Newt, the minimum HFR spot is always a vertical ellipse. I need to move the focuser a little out to get a proper round disk. This correction will only increase 0.1-0.2 HFR.
So I suggest to add roundness as for the Y value of the curve so that we can change monitoring from HFR to roundness when we like.
So the focus progress would be like that:
move focuser in one direction based on the HFR when HFR > 1.5 (a parameter)
received first <1.5 HFR
change Y value to roundness, calculate roundness instead of HFR
move focuser in the same direction and record roundness
received maximum roundness
move focuser back to meet the maximum roundness

I hope such function to be added into the focus module as an option.
Thanks.
The following user(s) said Thank You knro, Spartacus

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3 months 1 week ago
knro
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Focus on roundness #40839
Nice idea. Do you have any background in programming? We are very limited on resources and would appreciate more developers to step in.

Jasem Mutlaq
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3 months 1 week ago
ecloud
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Focus on roundness #40858
I do but not on C++
I'm not sure whether I could handle it or not.

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