EAF - Backlash?

Focusers, Filters, Barlows etc..

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Raptronix
Posts: 7
Joined: Mon Apr 15, 2019 11:24 am

EAF - Backlash?

Post by Raptronix » Thu Jan 02, 2020 11:14 am

Hiya. I've had problems for a little while where changing focus had little impact on the image, that I now realise is excessive backlash.

I was wondering what kind of backlash people are finding their EAF exhibits? I have measured mine half a dozen times and repeatedly find that it is 220, which seems huge?

So huge in fact that the capture program will not let me enter it as the field seems to top out at two digits, not three. I have not checked if I can enter such a large backlash amount into the ASIair yet as I've packed it to send it back to trade for the ASIair pro. (Does anyone know?)

Do you have any advice how to reduce this? I have checked that the lock screen onto the motor is tight.

This is the EAF connected to the SkyWatcher Esprit 100.

Cheers
Nick

James474789
Posts: 5
Joined: Thu Feb 28, 2019 12:57 pm

Re: EAF - Backlash?

Post by James474789 » Thu Jan 16, 2020 11:18 am

I have used my EAF on a ZS73 and Skywatcher 200pds. My measured backlash on the ZS73 was approx 50 and on the 200pds it is 130. 200 seems high but plausible?

You could enter backlash data into the ascom driver?

wvreeven
Posts: 47
Joined: Mon Apr 01, 2019 7:06 am

Re: EAF - Backlash?

Post by wvreeven » Thu Jan 16, 2020 12:25 pm

I use an EAF on a SkyWatcher Esprit 80ED and virtually encounter no backlash at all. Did you use the Takahashi Scope bracket or the original one? I use the Takahashi bracket and the EAF is attached rock solid.


HTH, Wouter

Raptronix
Posts: 7
Joined: Mon Apr 15, 2019 11:24 am

Re: EAF - Backlash?

Post by Raptronix » Thu Jan 16, 2020 12:40 pm

Thanks guys. I am using the original bracket as that was the only one I could find a way of attaching, albeit with only a single screw. I do have the Takashi/Esprit bracket ZWO do as well, but couldn't find a way of attaching it?

wvreeven
Posts: 47
Joined: Mon Apr 01, 2019 7:06 am

Re: EAF - Backlash?

Post by wvreeven » Fri Jan 17, 2020 12:23 pm

Remove the two bolts to the far end of the bottom plate of the focuser and attach the Takahashi mounting plate with two long Alan bolts. I can take some pics of my setup later today if you want.


Wouter

Raptronix
Posts: 7
Joined: Mon Apr 15, 2019 11:24 am

Re: EAF - Backlash?

Post by Raptronix » Fri Jan 17, 2020 12:40 pm

I'd appreciate that, thankyou.

I've posted a short video on facebook in the ZWO cameras group, asking about the play people have in the spindle. Does yours have any?

https://www.facebook.com/groups/zwoasiu ... 573151657/

wvreeven
Posts: 47
Joined: Mon Apr 01, 2019 7:06 am

Re: EAF - Backlash?

Post by wvreeven » Sat Jan 18, 2020 4:19 am

There is a little play but it is very small.

This is how I connected the EAF to my Esprit:
A96F5A1D-C87F-4CA7-A5F0-C0A4A3847F3D.jpeg

Raptronix
Posts: 7
Joined: Mon Apr 15, 2019 11:24 am

Re: EAF - Backlash?

Post by Raptronix » Mon Jan 20, 2020 1:23 pm

Interesting thankyou. I placed that bracket against those holes and they don't look like they line up. We have different focusers.
IMG_5595 copy.jpg

wvreeven
Posts: 47
Joined: Mon Apr 01, 2019 7:06 am

Re: EAF - Backlash?

Post by wvreeven » Mon Jan 20, 2020 8:52 pm

We do indeed. The little block with the clamp to tighten the focuser in my case sticks out and in your case it doesn’t.

galactique
Posts: 21
Joined: Wed Sep 11, 2019 8:19 am

Re: EAF - Backlash?

Post by galactique » Tue Jan 21, 2020 5:57 pm

Raptronix,

Did you solve this ??

I just bought an EAF for my Esprit 100, which has the same focusser as your image.

I held off buying the EAF until ZWO declared they had a bracket suitable (the Taka mount), which I bought in good faith, but this just leads to the same issue you have.

It seems it can only be secured with one bolt, which is no good at all.

Have you fixed it ? can you post another image if you have pleased.

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