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Thread: A Tasco 11TR fell into my lap..

  1. #21
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    Default Re: A Tasco 11TR fell into my lap..



    You may be able to cut the focuser tube a bit from looking at the picture but if you cannot get the full 30mm you may not be able to focus some eyepieces.
    There is always this if the heights are closer to stock: https://agenaastro.com/gso-1-25-refl...gle-speed.html
    Or you may find a helical focuser that would work. Good luck
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    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/Achro thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)
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  3. #22
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    Default Re: A Tasco 11TR fell into my lap..

    Quote Originally Posted by Gabby76 View Post
    You may be able to cut the focuser tube a bit from looking at the picture but if you cannot get the full 30mm you may not be able to focus some eyepieces.
    There is always this if the heights are closer to stock: https://agenaastro.com/gso-1-25-refl...gle-speed.html
    Or you may find a helical focuser that would work. Good luck
    Thanks Gabby, thats a great solution. Just spitballing now, but what about simply moving the primary mirror up from the bottom of the tube? Any thoughts? 30 mm isn't too far up the tube methinks...
    Ian

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  4. #23
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    Default Re: A Tasco 11TR fell into my lap..

    Prepping the Optical Tube for Paint.

    - Sand with 220 grit
    - wipe down with isopropanol
    - tape the Tasco sticker



    - Prime
    - sand
    - paint with white Rustoleum

    (to be continued)...
    Ian

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  5. #24
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    Default Re: A Tasco 11TR fell into my lap..

    Quote Originally Posted by kanadalainen View Post
    Thanks Gabby, thats a great solution. Just spitballing now, but what about simply moving the primary mirror up from the bottom of the tube? Any thoughts? 30 mm isn't too far up the tube methinks...
    Moving the mirror is another option to get the low focuser height into the proper position

    No original colour? White can be so plain at times. Candy Apple Red would look really good
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    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2" Orion Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/Achro thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)
    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: A Tasco 11TR fell into my lap..

    Quote Originally Posted by Gabby76 View Post
    Moving the mirror is another option to get the low focuser height into the proper position

    No original colour? White can be so plain at times. Candy Apple Red would look really good
    Thanks Gabby, I know, right? I am torn on either white or red. I've never owned a white scope, and white reflectors have a classic vibe; red/candy apple red would be much closer to the original colour of this reflector. Decisions, decisions...
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    Ian

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    Default Re: A Tasco 11TR fell into my lap..

    Candy apple red with Wimbleton white accents
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    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2" Orion Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/Achro thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)
    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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    Default Re: A Tasco 11TR fell into my lap..

    Hey Ian, hope all's well

    Nice to see you're getting this together! Gabrielle has a good idea for the paint; Candy Apple Red with white accents...

    Hate to say it, but you will run into focus problems with the Meade focuser. The focuser I used has the same body length as the original one. I mostly use KK Plossls in it (parfocal) and I have 1.2 centimeters of inward travel left. With my ES 68* 16mm, there's a centimeter left, and the 20mm has 1.3cm's.
    You could move the mirror upwards, but it might be easier to get another focuser, or cut down the one you have.

    Hope this helps,
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    1961 Tasco 12TE 60mm, Tasco 11TE-5 4.5", Tasco 3T 3". And a Canon T3 (1100D)

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    Default Re: A Tasco 11TR fell into my lap..

    Moving the Primary Mirror to accommodate the 1.25" focuser.

    In lieu of hacking up my Meade focuser, I decided to move the primary mirror up into the OTA. This meant cutting the bottom of the tube by 39 mm.
    I used a technique with painter's tape that my buddy employed while "chopping" the roof of his old Ford model A. Time-honoured and its works. I felt a little bad cutting this tube, for about 5 minutes.







    I shortened the tube by 39 mm, and then drilled the appropriate holes into the wall to mount the primary cell.
    Ian

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    Default Re: A Tasco 11TR fell into my lap..

    Centre - dotting the 11TR primary mirror

    I simply followed the method published by Gary Seronik:

    https://garyseronik.com/centre-dotti...rimary-mirror/

    I used a reinforcing circle for putting looseleaf in a binder, after locating the centre of the mirror by making a paper mockup and folding twice.



    Then I did a test fit of the cell to the rear of the scope's now-primed and shortened OTA.

    Seems to fit nicely!



    Note the overspray of white paint inside the OTA. I will fix this when I am sure the mock up is working properly.

    Stay tuned, I'm going to mock up the scope and test for function and back-focus. If I need to, I will adjust by cutting the OTA even more.
    Ian

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    Default Re: A Tasco 11TR fell into my lap..

    Installing the OTA's front cast iron ring and the secondary.

    Now I dug through my pile of parts (of course, set aside with assiduous care ) and found the screws to anchor the front ring. This has a marvellous effect of stiffening the entire OTA.

    Here is an image of the OTA ready to accept the Secondary mirror assembly.



    Installation of the secondary is easy-peasy.. just a couple of screws et voila.



    The beauty of the single vane secondary mount is minimization of diffraction when focused on a bright object. Planets, anyone??
    Ian

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