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Meade ETX80 in EQ mode?


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#1 norite

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Posted 23 October 2016 - 11:40 AM

Hi, does anyone know if it's possible to put the ETX 80 in EQ drive mode? I'd like to build a wedge for it and drive it equatorially so I can do some long exposure AP with it. Currently when I go into the autostar menu, the only option under Telescope > Mount is alt-az mode. The manual offers no help either. I've seen others making wedges and mounting it equatorially so it seems possible, there's just no explanation on how to set the drive and GOTO to operate in EQ mode.

 

Thanks


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#2 MistrBadgr

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Posted 23 October 2016 - 03:26 PM

I would think it could do that.  The older ETX 90 had a tripod with a tilting head, I think...not sure though.  I have an ETX 80 and I am wanting to start learning about imaging with it.  Let me do a bit of checking.  It might require a handset other than the 494, which is what I have, to some form of the 497.

 

Bill Steen


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#3 MistrBadgr

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Posted 24 October 2016 - 04:18 PM

I found out some things:

 

The ETX 80 was not built with imaging in mind, so there are no guarantees as to what it will do.  However, using a 497 or StarNavigator hand control and an 882 Tripod that can tilt, (it is the one the ETX 90 and 125 have come with), it may be possible.  The 494 handset that comes with the ETX 80 does not have programming in it for equatorial operation.

 

Making a wedge of some sort to go on the existing tripod may be a fairly inexpensive way to try things out, if you can come up with, beg, borrow, etc. a 497 or StarNavigator handset.  I am certainly going to try it myself to see what happens.  However, I have some other projects going right now that I cannot turn loose of, so it will be a while.

 

If you see your way to trying something like this, please post about what you find out! :)

 

The LS is not supposed to work in equatorial mode, but Wolfgang has been doing it with a lot of hard work and creativity.  Maybe the same will hold true for the ETX 80.

 

Hope this helps,

 

Bill Steen


Bill Steen, Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma

#4 Wolfgang

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Posted 25 October 2016 - 05:49 AM

Hello,
The LS has an option EQ-Mode in the setup. Only with this option will the ETX 80 on a pole height also work in the GOTO. Whether a # 497 hand controller on the ETX80 works is unknown to me.

Maybe this link can help:
http://www.astronomy...hotography.html
greeting
wolfgang


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Wolfgang

LS6 " Meade Zero Image-Shift Microfocuser, Mark III Hyperion Clickstop Zoom 8-24mm, Canon EOS 1100D, Sony DCS V3, Reducer Antares f / 6.3,


 


#5 Wolfgang

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Posted 25 October 2016 - 05:59 AM

Hello,
A trial variant of a wedge might look like this. Just rebuild and test with the existing GOTO on the ETX-80.
greeting
wolfgang

Attached Thumbnails

  • etx70polwiege1.jpg

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Wolfgang

LS6 " Meade Zero Image-Shift Microfocuser, Mark III Hyperion Clickstop Zoom 8-24mm, Canon EOS 1100D, Sony DCS V3, Reducer Antares f / 6.3,


 


#6 Wolfgang

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Posted 25 October 2016 - 06:18 AM

Hello,
Have found something here. Is concerned with the ETX-70, but why not at the ETX-80 ?? Is unfortunately a German forum, but one can fight through! :)

http://www.astrotref...hohenwiege.aspx

This is also very interesting:
http://www.weasner.c...tx70-wedge.html
greeting
wolfgang


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Wolfgang

LS6 " Meade Zero Image-Shift Microfocuser, Mark III Hyperion Clickstop Zoom 8-24mm, Canon EOS 1100D, Sony DCS V3, Reducer Antares f / 6.3,


 


#7 MistrBadgr

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Posted 25 October 2016 - 08:56 AM

Thanks, Wolfgang!

 

I appreciate the information, and will try something like that myself!

 

Best Regards,

 

Bill Steen


Bill Steen, Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma

#8 norite

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Posted 25 October 2016 - 09:32 PM

Thanks for the replies. I asked this same question on the cloudy nights forum, and was told to setup the telescope as an ETX 70 model; and this will give you the polar option, even with the 494 controller. I just did this and can confirm if you tell the controller it's an ETX70, the polar option appears.

 

So I will have to build a wedge and try this out!



#9 MistrBadgr

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Posted 26 October 2016 - 06:17 AM

Thanks for the information!  I will try that myself.

 

Bill Steen


Bill Steen, Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma

#10 Wolfgang

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Posted 26 October 2016 - 07:18 AM

Hello notite,
It is nice to hear that ETX-80 also works on a Wedge with # 494.
So good luck getting the ETX-80 Setting the EQ mode.
greeting
wolfgang


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Wolfgang

LS6 " Meade Zero Image-Shift Microfocuser, Mark III Hyperion Clickstop Zoom 8-24mm, Canon EOS 1100D, Sony DCS V3, Reducer Antares f / 6.3,


 


#11 norite

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Posted 26 October 2016 - 10:11 AM

I'm curious as to how well that wedge in that picture works, since opening and closing it traces an arc, but the long screw is straight...does it pivot?
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#12 Wolfgang

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Posted 26 October 2016 - 10:59 AM

Hello norite,
the image I have from the net. I have no idea how it works properly. I am of the opinion that it is only an experimental arrangement to make an EQ test by simple means.
I think the fastening of the screw takes place via a slot, so that the angle can be adjusted.
greeting
wolfgang

Attached Thumbnails

  • post-100246-0-32475300-1477403945_thumb.jpg

Clear Skies

Wolfgang

LS6 " Meade Zero Image-Shift Microfocuser, Mark III Hyperion Clickstop Zoom 8-24mm, Canon EOS 1100D, Sony DCS V3, Reducer Antares f / 6.3,


 


#13 norite

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Posted 27 October 2016 - 07:18 AM

I've started building a wedge. I'll post some pictures when I'm done

#14 MistrBadgr

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Posted 27 October 2016 - 06:48 PM

Good!  I will look forward to seeing  your creation! :)


Bill Steen, Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma

#15 norite

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Posted 29 October 2016 - 04:01 PM

I'm using this wedge as the basis for mine:
http://www.weasner.c...004/wedge2.html

 

I've got the arms cut out and the bases, but I'm going to drill a hole at an angle through the base  and thread a very long bolt through it so I can control the latitude, and also not have to hold the telescope while I loosen the bolts on the arms



#16 MistrBadgr

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Posted 29 October 2016 - 06:49 PM

That is a really nice looking wedge!  I agree with you about that being the best way to go.  It does need a bolt mechanism of some sort for fine adjustments with the scope on the wedge.  Might need to round off the flat sides of the nuts that touch the tangs hooked to the wood in order to let them rotate as needed.  If they are left flat, then there will be less range of movement before something binds.

 

Thanks,

 

Bill Steen


Bill Steen, Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma

#17 Wolfgang

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Posted 30 October 2016 - 11:18 AM

Yes, this is, of course, the better wedge! :) 
Have fun yourself build and report their success.
greeting
wolfgang


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Wolfgang

LS6 " Meade Zero Image-Shift Microfocuser, Mark III Hyperion Clickstop Zoom 8-24mm, Canon EOS 1100D, Sony DCS V3, Reducer Antares f / 6.3,


 


#18 norite

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Posted 03 November 2016 - 08:02 PM

So I started making the wedge. Drew and cut the arms first:
IMG_20161029_164331%255B1%255D.jpg

I found that the arm drifted even though I measured it so I had to widen it on the inside so it would move freely against the bolt.I've used a corer to cut out some circular handles which I'll install on the bolts to help loosen/tighten the arms

IMG_20161101_223101%255B1%255D.jpg


Added the latitude control bolt:
IMG_20161103_173335%255B1%255D.jpg

IMG_20161103_173410%255B1%255D.jpg

I'm going to add the other arm and drill holes for the telescope mounting bolts. I'm also going to add another base that'll allow me to swivel the wedge left/right. I'll also add a latitude marker plate to the one side. When it all fits together I'll take it apart give it a good sand and paint it. My only costs so far have been getting a compass big enough to draw the arms and the bolts, machine screws and the hinges. I have plenty of spare wood and MDF board lying around to use :)
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#19 Wolfgang

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Posted 04 November 2016 - 08:55 AM

Hi norite,
This looks very good from what they have constructed.
I would put the pole height setting a bit further. See image.
This reduces the force required for setting the pole height.
I am waiting for the end result.
greeting
wolfgang

Attached Thumbnails

  • IMG_20161103_1734101.jpg

Clear Skies

Wolfgang

LS6 " Meade Zero Image-Shift Microfocuser, Mark III Hyperion Clickstop Zoom 8-24mm, Canon EOS 1100D, Sony DCS V3, Reducer Antares f / 6.3,


 


#20 MistrBadgr

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Posted 04 November 2016 - 09:14 AM

Cool!!! :) 


Bill Steen, Sky Hunters' Haven Observatory, Broken Arrow, Oklahoma




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