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INDI Library v1.8.0 is Released (27 Jul 2019)

INDI Library v1.8.0 is mostly a maintenance release to fix a few bugs in several drivers.

ZWO ASI EAF - experiences? - driver support for backlash compensation?

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ZWO ASI EAF - experiences? - driver support for backlash compensation? was created by fusis

Hi,

I'm about to upgrade from the standard skywatcher auto focuser combined with the Hitec Astro DC focus to the more robust ZWO ASI EAF.

Would anyone owning the ZWO ASI EAF care to share the experiences you have until now?

One thing that the driver for the Hitec Astro dearly missed was backlash compensation which renders the setup useless.

Does the Indi driver have backlash compensation built into it?

Thanks,

Marco
Marco
EKOS - Stellarmate Nightly Builds | EQ5Pro | ZWO ASI294MC Pro | ZWO ASI385MC | HiTecAstro DC Focus

2 weeks 2 days ago #41756

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Replied by DerPit on topic ZWO ASI EAF - experiences? - driver support for backlash compensation?

Unfortunately, it doesn't.
I cannot tell whether this is an issue of the (INDI) driver or the firmware, but currently there is no such option in the INDI Control Panel.
I know within ASICAP (which can also control the focus) there is support for backlash compensation, but I do not know if that is doing it in ASICAP or using some HW setting....

Apart from that shortcoming the EAF is really a beautiful and solid device, and I'm somewhat hoping that this issue gets solved sooner or later, as ZWO also uses INDI (via ASIAir) and will for sure get complaints about that ;)
openSUSE Tumbleweed KStars git INDI git
GPDX+EQMOD, CEM60EC, ASI1600+EFW+ASI290 mini
The following user(s) said Thank You: fusis
2 weeks 1 day ago #41775

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Replied by DerPit on topic ZWO ASI EAF - experiences? - driver support for backlash compensation?

OK, I got curious and downloaded the EAF SDK. Seems the focuser itself does support backlash correction, so it is just not yet in the INDI driver.
openSUSE Tumbleweed KStars git INDI git
GPDX+EQMOD, CEM60EC, ASI1600+EFW+ASI290 mini
2 weeks 1 day ago #41776

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Replied by fusis on topic ZWO ASI EAF - experiences? - driver support for backlash compensation?

Thanks DerPit,

Would you know where I could check out the features of the numerous drivers, seems I can only see it when I actually have device connected.

Marco
Marco
EKOS - Stellarmate Nightly Builds | EQ5Pro | ZWO ASI294MC Pro | ZWO ASI385MC | HiTecAstro DC Focus

2 weeks 10 hours ago #41843

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Replied by DerPit on topic ZWO ASI EAF - experiences? - driver support for backlash compensation?

You can check the drivers page (indilib.org/devices), some of them have a complete description of the features. But the EAF for example isn't on there yet, as the unit is brand new...
openSUSE Tumbleweed KStars git INDI git
GPDX+EQMOD, CEM60EC, ASI1600+EFW+ASI290 mini
2 weeks 8 hours ago #41848

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Replied by Robomort on topic ZWO ASI EAF - experiences? - driver support for backlash compensation?

Does the EAF have gear reduction? With MyFocuserPro powered 1:27 reduced motor I have such fine resolution (many steps/mm) that backlash is not an issue even @1625mm FL
2 weeks 7 hours ago #41850

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Replied by DerPit on topic ZWO ASI EAF - experiences? - driver support for backlash compensation?

I don't really understand that comment. Backlash doesn't depend on steps/mm, if anything it gets worse with better resolution, isn't it? Also, the backlash often is in the focuser mechanics, not in the motor system.

But yes, it has a gear system, though I don't know the exact ratio.
openSUSE Tumbleweed KStars git INDI git
GPDX+EQMOD, CEM60EC, ASI1600+EFW+ASI290 mini
1 week 6 days ago #41863

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Replied by fusis on topic Re:ZWO ASI EAF - experiences? - driver support for backlash compensation?

Derpit, I think a saw you mention in another post that backlash compensation turned up as a setting in the driver. Care to share your experience?

Verstuurd vanaf mijn ONEPLUS A5010 met Tapatalk
Marco
EKOS - Stellarmate Nightly Builds | EQ5Pro | ZWO ASI294MC Pro | ZWO ASI385MC | HiTecAstro DC Focus

2 days 9 minutes ago #42266

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Replied by DerPit on topic Re:ZWO ASI EAF - experiences? - driver support for backlash compensation?

Yes, it is now officially supported by the INDI driver and works very well. Mine has a backlash of 35 steps that seems to come from the gear box of the stepper unit itself. It's less than what my Pegasus DMFC has.
So if you need a (cheap) motor focus, get the EAF, I doubt you'd be disappointed :)
openSUSE Tumbleweed KStars git INDI git
GPDX+EQMOD, CEM60EC, ASI1600+EFW+ASI290 mini
1 day 22 hours ago #42271

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