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Old 16-04-2016, 08:01 PM
carlosgib (Charles)
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CCDAP autofocusing off-set filter settings

Hi guys,

I am adding autofocusing to my imaging plans, currently I have a Robofocus connected to maxim DL, and in turn I use CCDAP to interfaces and controlling my CCD, guiders, mounts, focusers etc. I managed to use CCDAP to autofocus successfully using MDL to focus and create the 'V' curve and actually achieve good autofocusing.

I was wondering if someone in the forum could kindly explain how to set-up the filter off-set in CCDAP. I been reading the manual and having difficulty to what setps to take to setup the parameters.



Thanks,

Charles
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Old 17-04-2016, 10:58 PM
stevous67 (Steve M)
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Hello Charles,

Filter offsets are in the Focusing tab, and are visible once you have connected the filter wheel for the first time [see attached].

You need to have a base filter with a reference of 0 [zero], and off this filter you dial in the focus differences of each other filter relative to this base filter. The above example was with the Clear as base, and coincidentally, the Green was the same [its not always the case that filters are exactly par focal].

The number of the difference depends on your focuser movements.

Hope that helps a little.

Steve
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Old 19-04-2016, 12:55 PM
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DavidNg (David)
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Hi,
CCDAutopilot has a function that can automatically determine the off-set needed for your filter set up.

On another note, I found FocusMax works seamlessly with RoboFocus and CCDAP, although FocusMax is no longer a free software in latest versions.

Cheers
David
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Old 05-06-2016, 10:45 PM
carlosgib (Charles)
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Hi, thanks for the replies, I have taken a bit of time, but I been working out on Focusmax and managed to create good V Curses and autofocusing is good, with Robofocus and CCDAP. In the last weeks or so, I tried the offsets filter within CCDAP, but having issue.
For starters the offset median after 5 measurement of the 7 filters and taking the Lum as the based (0) were all in negative, meaning if I took these figures as correct, I will be subtracting the from the focused HFD instead of adding.

So, for starter. I am using a Tak106ed, with robofocus, in the CCDAP 'Focus Offset Measurement', does someone with similar setup know the CFZ Threshold??

Thanks
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Old 06-06-2016, 06:51 PM
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bert (Brett)
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Can you post a screen shot?

I don't know what you mean by adding or subtracting HFD's. Hfd's are irrelevant to the offsets.

If the Step figures in ccdap are all minus, then it means that all your other filters are one one side of luminance focus point (either inside of focus or outside, depending on focuser travel direction). Personally I would focus on one of the colour filters as a reference filter on a refractor, due to minute amounts of chromatic aberration, even on the 106. I personally use red.

The CFZ calculator is a part of ccdap, from memory under tools tabs.
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