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Finder bracket mismatches

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#1 RocketScientist

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Posted 27 October 2020 - 07:02 PM

I'm seriously considering purchasing either an Explore Scientific AR-102 or an Astrotech AT-102ED. But this post is not about that decision, but a question about mounting a finder on either of them.

The AR-202 comes with a straight-through finder that has gotten mixed reviews. The AT102ED doesn't come with a finder, and as far as I can determine, doesn't come with a shoe for a finder either.

My current scopes with finders (see list below) use finders in Orion-style brackets. I'd like my new refractor, whichever it may be, to use the same type of bracket/shoe so I can easily swap finders.I already have an 8x50 RACI, a 9x50 RACI, and a 6x30 straight, and really don't want to buy another. I have already confirmed that I can easily swap finders between the Z10 and C5.

Could anyone please give a clear explanation of the different types of finder bracket/shoe and which adapters would be needed to mount these finders on the AT102ED and AR102?

Thanks,
Cathy

Current scopes:
Z10 10" f5 Dob
C5 (XLT 127) SCT on CG-4
ETX-125
ETX-80

#2 SloMoe

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Posted 27 October 2020 - 07:53 PM

Is by chance what you're calling the "Orion Shoe" actually a Synta/Vixen shoe like this?

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#3 SloMoe

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Posted 27 October 2020 - 08:06 PM

First page of the owners manual shows which screws are to be removed to install a Synta/Vixen shoe.

 

You only use one screw to hold the finder onto the focus draw tube housing,

 

Here's a link to that first page, bet if you keep reading in the owners manual it will be described to you.

 

http://pdfstream.man...cc9d846e9dd.pdf



#4 SloMoe

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Posted 27 October 2020 - 08:09 PM

Well, it looks like this is all they give you with the owners manual,,,,,,,

http://pdfstream.man...cc9d846e9dd.pdf

 

Installing the Multiple Reticle Finder: There are two holes for
mounting the finder, at the 10 o’clock and 2 o’clock positions on the
top of the focuser, 3/4” behind the focuser rotation locking collar. The
holes have screwdriver-slotted inserts to keep dust out of the scope.
Please carefully note the position of the finder mounting holes in the
illustration on the front page. There are also two hex-head inserts
immediately behind the finder mounting holes. Do not loosen these
hex-head inserts, as they are for factory adjustments of the focuser
mechanism only. Undoing them will void your warranty.
Choose on which side of the scope you want to mount your finder,
remove the appropriate slotted-head insert, and install your finder
bracket in the exposed hole per the separate finder instruction sheet.Installing the Multiple Reticle Finder: There are two holes for

mounting the finder, at the 10 o’clock and 2 o’clock positions on the
top of the focuser, 3/4” behind the focuser rotation locking collar. The
holes have screwdriver-slotted inserts to keep dust out of the scope.
Please carefully note the position of the finder mounting holes in the
illustration on the front page. There are also two hex-head inserts
immediately behind the finder mounting holes. Do not loosen these
hex-head inserts, as they are for factory adjustments of the focuser
mechanism only. Undoing them will void your warranty.
Choose on which side of the scope you want to mount your finder,
remove the appropriate slotted-head insert, and install your finder
bracket in the exposed hole per the separate finder instruction sheet.


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#5 RocketScientist

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Posted 27 October 2020 - 08:35 PM

Yes, your Synta/Vixen shoe image looks right. I am not clear on the correct names, so I didn't try to use them in my post.

I looked at the AT102ED manual earlier, but didn't really understand it because the pictures in it aren't really adequate.

So my real question seems to be, "Exactly what parts do I need to order to install a Synta/Vixen finder shoe on an AR102 and/or an AT102ED, and are there any issues or tricky steps to doing so?"

#6 mikerepp

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Posted 28 October 2020 - 07:07 AM

You can purchase adapters that will fit various different configurations. Scopestuff is a real good source for these adapters, no need to change what is on the scope if you don't want to.



#7 SloMoe

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Posted 28 October 2020 - 07:16 AM

You can purchase adapters that will fit various different configurations. Scopestuff is a real good source for these adapters, no need to change what is on the scope if you don't want to.

The OP is asking how to put a finder shoe onto a scope that doesn't already have a shoe on it from the factory, not about replacing a shoe.



#8 Chris Johnson

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Posted 28 October 2020 - 07:38 AM

My recently received AT102ED did not come with a finder and bracket. The only accessories included were 2 tube rings and a vixen dovetail. I purchased the Agenaastro XFURB bracket which, mounts perfectly on the focuser using the existing screws.


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#9 SloMoe

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Posted 28 October 2020 - 07:43 AM

Ok, I found an article on Agena's site too, it's nice that they have the proper length screws already on there, thanks Chris

 

https://agenaastro.c...ord-focuser.htm

 

In this linked article you'll see where the same screws are on your focuser, most of the Crayfords are the same, in the owners manual I linked look for the the "Alternate Finder Mounting Location"  screw in the picture on the right hand side.

 

In the linked article the GSO uses hex head set screws, on your focuse housing they use Phillips head screws, but the same location towards the front.

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  • attach_finder_crayford_02.jpg

Edited by SloMoe, 28 October 2020 - 08:12 AM.

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#10 RocketScientist

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Posted 28 October 2020 - 08:58 AM

Thanks very much to everyone for your help.

 

One additional question:  if the standard shoes used by Zhumell, Orion, and others are more correctly called "Synta/Vixen shoes", what is the correct term for the type of shoe that Explore Scientific uses on their AR-102? I'm guessing that this alternate shoe is used by other companies as well, so it may not be best described as an Explore Scientific shoe.



#11 SloMoe

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Posted 28 October 2020 - 09:19 AM

Yeah, Looks like ES has their own finder shoe, here's a thread on how to change it over to the more standard Synta/Vixen

 

https://www.cloudyni...r-es-refractor/


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#12 MarkMittlesteadt

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Posted 28 October 2020 - 10:12 AM

Thanks very much to everyone for your help.

 

One additional question:  if the standard shoes used by Zhumell, Orion, and others are more correctly called "Synta/Vixen shoes", what is the correct term for the type of shoe that Explore Scientific uses on their AR-102? I'm guessing that this alternate shoe is used by other companies as well, so it may not be best described as an Explore Scientific shoe.

For whatever reason ES chose to use the old "Meade" finder shoe,. while 90% of the astronomy world uses the Vixen/Synta style shoe. Just more proprietary function. Thankfully there are adapters or replacements. 



#13 SloMoe

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Posted 28 October 2020 - 10:43 AM

Here's the adapter that will convert the ES shoe to a Synta/Vixen shoe, from Scopestuff.

http://www.scopestuff.com/ss_s2es.htm

 

 

Attached Thumbnails

  • ss_s2es2.jpg


#14 SloMoe

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Posted 28 October 2020 - 11:43 AM

So, to answer your original question, either scope can be set up for the Synta/Vixen shoe without much trouble,

 

You wouldn't  need to purchase another finder, what you already have can be used.



#15 SonnyE

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Posted 28 October 2020 - 03:58 PM

Yes, your Synta/Vixen shoe image looks right. I am not clear on the correct names, so I didn't try to use them in my post.

 

That's OK, Cathy, you'll learn here. wink.gif

 

Slo Mo's gottcha, you won't fall. grin.gif




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