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2" focuser on Tasco 10TE-5

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#1 deSitter

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Posted 05 September 2024 - 05:09 PM

I have a Tasco 10TE-5 that was my first foray into classic world about 10 years ago. It was pretty rough cosmetically and nearly hopeless mechanically. But, it has a pristine and high performance AO objective.

 

The box is crumbling, the styrofoam is mangled, the eyepieces were mostly missing, and the restored mount is still not great with a lot of irreducible slop in declination and recalcitrant bearings in RA. So it doesn't have much chance of returning to new condition under my watch, as it would with our artists around here.

 

Last winter I picked up a Sears 6335 in its hain't grey garb, just a beautiful scope and in excellent condition mechanically and cosmetically, with just as nice an objective as the Tasco (it's really the same OTA). I've borrowed a part from the Tasco mount to replace the one missing piece of Sears mount, the altitude standoff gizmo. I also borrowed the trash can lid until I can 3D print a replacement.

 

SO - since the tube of the Tasco desperately needs a strip and repaint, I'm thinking about chopping off some of the tube and installing a 2" focuser, no so much for eyepieces as to hold rock steady a binoviewer. This will be easy, because the Tasco finder is actually mounted to the focuser, not the tube.

 

If I do this, will I be kicked out of the classics club? Anyone have any experience with 2" on classic scopes?

 

-drl



#2 Russell Smith

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Posted 05 September 2024 - 05:13 PM

As long as you post plenty of photos of the transition your membership should be safe.:)
Sounds like a fun project.
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#3 deSitter

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Posted 05 September 2024 - 05:29 PM

Does anyone know the focuser thread diameter/pitch offhand? It occurs to me I can use an SCT focuser if I can find an adapter for the tube flange thread to SCT thread.

 

-drl



#4 Russell Smith

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Posted 05 September 2024 - 06:02 PM

I have this extra flange. The diameter is 60mm but the threads don't seem to have a good match in metric.

Cutting new ones may be one way.

PM me if you want this one to play with.

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#5 deSitter

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Posted 05 September 2024 - 08:06 PM

I have this extra flange. The diameter is 60mm but the threads don't seem to have a good match in metric.

Cutting new ones may be one way.

PM me if you want this one to play with.

Thanks! It's the thread in the aperture, much smaller than 60mm.

 

-drl



#6 apfever

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Posted 06 September 2024 - 09:02 AM

Cut a section out, sleeve it, and call it a baffle. If youj're cutting, you're cutting. Go with a slip on focuser and nice mounting bolts. 

Then take your franken freak and get out. smile.png



#7 tony_spina

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Posted 06 September 2024 - 10:29 AM

Oh the horror! I think I'm going to be sick vomit.gif

 

 

With that said let's see some pictures!


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#8 Garyth64

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Posted 07 September 2024 - 12:34 PM

Careful on how much you cut off the tube.  The focus is still quite far away.


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#9 deSitter

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Posted 07 September 2024 - 12:42 PM

Careful on how much you cut off the tube.  The focus is still quite far away.

Indeed - I will do preliminary checks with a 1.25" diagonal. I would prefer a really solid 1.25" solution but I don't have a diagonal robust enough to hold up a binoviewer without me constantly worrying about it. Even my Tak is a lightweight.

 

-drl



#10 Russell Smith

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Posted 07 September 2024 - 01:18 PM

If yours has the chrome draw tube you may be able to remove it and then add a visual back. 

I don't have a bino viewer to try it 

It still may be too short. That's one long draw tube.

 


Edited by Russell Smith, 07 September 2024 - 01:19 PM.


#11 deSitter

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Posted 07 September 2024 - 01:43 PM

If yours has the chrome draw tube you may be able to remove it and then add a visual back. 

I don't have a bino viewer to try it 

It still may be too short. That's one long draw tube.

I have that done, but it's not stout enough to hold up a binoviewer in a stress-free (for me) way. The classic focusers just can't support so much weight.

 

I would also like to use one of these scopes with a 56mm Plossl and 40mm super-wide.

 

-drl


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#12 Tenacious

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Posted Yesterday, 10:14 PM

Hi drl

 

I've used my binoviewer with much larger scopes.  Are you going to get enough light from a mere 76mm of aperture (binos eat a lot of light splitting the beam to 2 eyes!) to even make this irreversible mod useful?  Just asking....

 

I don't think anyone wants to revoke your classics membership.   grin.gif


Edited by Tenacious, Yesterday, 10:19 PM.


#13 deSitter

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Posted Yesterday, 11:14 PM

Hi drl

 

I've used my binoviewer with much larger scopes.  Are you going to get enough light from a mere 76mm of aperture (binos eat a lot of light splitting the beam to 2 eyes!) to even make this irreversible mod useful?  Just asking....

 

I don't think anyone wants to revoke your classics membership.   grin.gif

 

We will see! I have a 90mm modern refractor that already has a 2" focuser - I'll try with that before proceeding.

 

-drl




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