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ZWO EAF Focuser

astrophotography equipment imaging
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35 replies to this topic

#1 mxcoppell

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Posted 24 March 2019 - 01:29 PM

https://astronomy-im...product/zwo-eaf

 

Looks very interesting. Not sure how the L bracket is attached to the focuser though. But from the design, I think it's better than the Sesto Senso I am using at the moment (attaching to the focuser). 



#2 orangeusa

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Posted 25 March 2019 - 12:58 PM

So, it's not out yet.. But this is a step in the right direction. 



#3 mxcoppell

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Posted 25 March 2019 - 05:29 PM

Well, not sure if it breaks the rules again. These are from Chinese Astronomy Forum (bbs.imufu.cn). They are not stock pictures. 

 

Original post address: http://bbs.imufu.cn/...read&tid=781021. I will add translation for each picture.

 

Packaging Content

220108qhhpudcdqjcix8xd.jpg

 

High quality build

220107cgt8131v8fvdmouf.jpg

 

220107m53a5j6yxyadoe9o.jpg

 

221027qpbbx0tn6duxztat.jpg

 

The face plate is made of stainless steel. Very solid.

220107xvx3xsccjihuucjc.jpg

 

 

Dimension 6cm x 5cm x 4cm, 277g

220107n6dki6lkodymi7my.jpg

 

4 couplings, on scope focuser side, the diameters are 4mm/5mm/6mm/7mm (duh, FSQ-85 are 3.5mm and 8mm).

220106k9qsrbl5u99wffbf.jpg

 

220106z54s3j5j5l84ql5j.jpg

 

The OP's scope is Takahashi as well and the L-bracket plate doesn't match.

220107vharj1fnl0n900sv.jpg

 

ASCOM Interface

220106g0hu0opetioylkio.jpg


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#4 mxcoppell

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Posted 25 March 2019 - 05:32 PM

Here is another one: http://bbs.imufu.cn/...read&tid=780491


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#5 mxcoppell

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Posted 25 March 2019 - 05:33 PM

There are 2 missing pieces of ASIAir - Polar Alignment and AF. Now one is filled.


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#6 alpo16000

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Posted 28 May 2019 - 02:56 AM

The first batch of ZWO EAF is on the way (tracking number received) !!!
I'll receive mine Friday (ordered on zwo website)
So happy  whee.gif


Edited by alpo16000, 28 May 2019 - 06:31 AM.


#7 Tapio

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Posted 28 May 2019 - 03:41 AM

Just waiting of actual reports. The driver/software part is interesting (as QHY/ZWO) sometimes could have done better...



#8 ChrisWhite

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Posted 29 May 2019 - 09:24 AM

I agree it's pretty cool to keep seeing new stuff roll out of these companies.  I think this is a nice missing step for the ASIair, however I won't use that system until they integrate an ascom focuser that can utilize moonlite/optec, etc... 



#9 Biggen

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Posted 29 May 2019 - 11:27 AM

Can the focuser only be used with the ASIAIR?

 

Edit: Nevermind.  I see it's ASCOM compatible.


Edited by Biggen, 29 May 2019 - 11:28 AM.


#10 davidparks

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Posted 29 May 2019 - 10:26 PM

Nicely packaged, arrived direct from China to Michigan in 5 days (over the holiday weekend even).

I found it easy to install on my William Optics Zenithstar 73, however, no instructions were included.

 

I made another post over in this thread with a bit of a comparison with the Sesto Senso.

 

Seems to work great in both ASCOM and ASIAIR.  Hopefully I’ll see clear skies soon waytogo.gif


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#11 davidparks

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Posted 29 May 2019 - 11:21 PM

Focusing test went really well!  I didn’t use the Bahtinov Mask, just the focus assistant in ASIAIR.  I felt I was able to achieve very fine focus quickly and easily.  The ASIAIR Goto, Platesolving/Sync/Center, and Guiding also worked perfectly, even though I had only set the scope level and pointed at Polaris.  No other Polar Alignment done.   My RMS error was 6, but still the ASIAIR guided just fine for 10 minutes or so while I fiddled with focus, exposures, etc.

 

I am really quite impressed with how the EAF and ASIAIR work together.

 

22n5ec.jpg



#12 DevilJack

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Posted 30 May 2019 - 01:08 PM

David,

 

Which version of the EAF focuser did you need for your ZS73?

 

Thanks - JG



#13 davidparks

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Posted 30 May 2019 - 02:08 PM

David,

 

Which version of the EAF focuser did you need for your ZS73?

 

Thanks - JG

I ordered just the Standard Version, because I don't plan to use temperature compensation, and didn't want to wait for the Hand Controller to become available  (I'll be able to purchase that separately when it becomes available).   Of the 4 bushings, I believe it was the 3rd largest size that fit the WO Z73.  The smallest bushing fit the fine focus shaft on the right side of the WO Z73, but the bracket would not clear the outer race of coarse/fine shaft housing.  It would be way too slow attached to the fine shaft anyway.

 

The EAF comes with 4 different flexible bushings to accommodate common size focus shafts.  The mounting bracket can also be utilized for many different focusers, as it is slotted and can "flip over" to be used one way or another to fit many scopes.  I would check the list of compatible scopes on ZWO's product page, and also look in their forums, as many questions and answers about "will it work with this scope..." has been answered there.  I believe ZWO will also be making other brackets available for more scopes at some time.



#14 mxcoppell

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Posted 31 May 2019 - 02:25 AM

@david,

 

You got it! I haven't received mine from HP yet. First question first, David, how do you compare the easiness of installation between EAF and Sento Senso?

 

Please, some pictures of the EAF on the scope?

 

Thanks!


Edited by mxcoppell, 31 May 2019 - 02:27 AM.


#15 davidparks

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Posted 31 May 2019 - 10:49 AM

So far it seems very nice, I am hoping for clear skies yet tonight, but I did get about 15 minutes with it before clouds rolled in.  Working with the ASIAIR which also now has Polar Alignment (waiting for the iOS update) the focuser works really good.

 

Here is a bit of info I posted with some pictures:  https://www.cloudyni...otor/?p=9398121



#16 Der_Pit

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Posted 01 June 2019 - 07:59 AM



The smallest bushing fit the fine focus shaft on the right side of the WO Z73, but the bracket would not clear the outer race of coarse/fine shaft housing.  It would be way too slow attached to the fine shaft anyway.

 

YMMV, but my experience with using the fine shaft for motor focus are bad anyhow: At least mine has a non-reproducible slip that likely depends on temperature and resistance (i.e., on pointing, due to varying gravity pull on the camera).  Might be different for other/better setups (though mine is an Astro-Physics...), but I can turn the fine knob while preventing actual movement by holding the coarse one on the other side.

The slowness was not a real issue, but the autofocus routine went crazy and was unable to determine proper focus.

 

As for the EAF: While I already have a motor focus for my scope (Pegasus DMFC), I'm highly tempted to just order one of the ZWO units.  They are really building very nice stuff....


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#17 niccoc1603

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Posted 15 June 2019 - 08:10 AM

How do you set the focuser step size?

#18 gene williams

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Posted 13 December 2019 - 07:26 AM

Is the ZWO focuser able to allow the user to easily switch to manual focus, like the Rigel nStep?  I liked how the Rigel nStep could be disengaged on a moments notice, to get in the focus ballpark, then re-engage and do the final focus on the computer.  



#19 Der_Pit

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Posted 13 December 2019 - 09:31 AM

No, it doesn't.  The motor+gears unit is solidly connected to the axis of the focuser.


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#20 OldManSky

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Posted 14 December 2019 - 03:37 PM

As Der Pit mentioned, you can't easily dis-engage it.  I personally don't consider that a shortcoming, and I wouldn't dis-engage even if I could.  Once you've used it a few times, you can easily note where your setup is close to focus, and just tell the focuser in software to go to that position.  Then run AF from there.  It's simple to run the focuser all the way in (to 0 position, for storage of the scope or whatever).  I keep my imaging train intact for months at a time, and have no need of any kind for manual adjusting of anything.


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#21 ksouers

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Posted 14 December 2019 - 10:55 PM

As Der Pit mentioned, you can't easily dis-engage it.  I personally don't consider that a shortcoming, and I wouldn't dis-engage even if I could.  Once you've used it a few times, you can easily note where your setup is close to focus, and just tell the focuser in software to go to that position.  Then run AF from there.  It's simple to run the focuser all the way in (to 0 position, for storage of the scope or whatever).  I keep my imaging train intact for months at a time, and have no need of any kind for manual adjusting of anything.

I have found that every once in a while it is necessary to re-zero the focuser to "clear" the accumulated errors. For me that means disengage the motor and manually run the drawtube all the way in, and in the focus controller run it to zero or reset zero, then re-engage the focus motor. The Rigel needs this somewhat frequently, but I suspect that's more because the GSO focuser it's attached to has a bit of slip. I also suspect the motor has a tendency to skip a tic or two affecting repeatability.

 

The Moonlite needs this too, but not nearly so frequently. I usually zero out with the change of season, just because I can.

 

If the grub screw securing the coupler to the focus shaft is easily accessible this shouldn't be a show-stopper.

 

Kevin
 


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#22 astroseyer

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Posted 15 December 2019 - 04:34 PM

I'm going to try re- installing the EAF o n my Esprit 80 with their new supposed Skywatcher adapter bracket. The original one most definitely took some tweaking and the unit only wants to work mounted crooked. Will post results.


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#23 gene williams

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Posted 17 December 2019 - 07:31 PM

As Der Pit mentioned, you can't easily dis-engage it.  I personally don't consider that a shortcoming, and I wouldn't dis-engage even if I could.  Once you've used it a few times, you can easily note where your setup is close to focus, and just tell the focuser in software to go to that position.  Then run AF from there.  It's simple to run the focuser all the way in (to 0 position, for storage of the scope or whatever).  I keep my imaging train intact for months at a time, and have no need of any kind for manual adjusting of anything.

Well, I went ahead and ordered one.  It sure beats the price of the Rigel nStep, and is a much cleaner look.  $179.99 at Agena on sale, shipped to my door.  What a deal.  



#24 gene williams

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Posted 17 December 2019 - 09:07 PM

I'm going to try re- installing the EAF o n my Esprit 80 with their new supposed Skywatcher adapter bracket. The original one most definitely took some tweaking and the unit only wants to work mounted crooked. Will post results.

Received mine in the mail today, took about an hour to install on an Apertura 60ED (clone of the Astro Tech 60ED, and same focuser as the William Optics 61 Zenithstar), after I learned the trick to removing the coarse focus knob.  After removing the set screw from the coarse focusing knob, I tried and tried to remove the it, but luckily, found someone else's post here on CN about having the same trouble on a William Optics Zenithstar 61.  The outer set screw is just a blank, and there is another down deep inside you have to unscrew.  It fell out inside, and it was rattling around in there.  Lined it up again using a flashlight, and went down the hole with the supplied long allen wrench, and found a third screw to grab onto.  Popped right off after finding that one.  Only problem is I can only find two set screws, even though I think I removed three lol.  Oh well, at least the coarse knob is removed!

 

One thing I had trouble with after the coarse focus knob, were the set screws to hold the coupler onto the shaft had a little too much loctite on a couple of them.  When I went to tighten one of them up, the cheap allen wrench stripped it out.  Had to use vice grips to remove it, and used another set screw.  Luckily they give you extras.  I would advise using the ones with less loctite on them, because they used a little too much on a couple of them.  

 

Now I just need to find a power supply to test it out.  They don't give you one with the kit, but a standard 1/2 amp power supply should work just fine.  

 

Here are some pics of the final install.  Notice I only used the "blank" set screw hole to attach the bracket.  It is, however, extremely solid just using that one screw to hold the bracket onto the bottom of the Apertura's focuser.  

 

DSC02744
ZWO EAF
DSC02745
DSC02739
DSC02741

Edited by gene williams, 17 December 2019 - 09:26 PM.

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#25 OldManSky

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Posted 18 December 2019 - 01:47 PM

Nice, Gene.

You know, the other side of the focuser has the same "blank setscrew hole."  You can remove the placeholder there, and use it to screw in the other side of the mounting plate, for a bit more stability...




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