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Equipment Discussions >> Classic Telescopes

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ngc2289
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Reged: 04/13/05

Loc: Corpus Christi, TX.
Re: Fair price for Unitron 75mm f/16 Objective. new [Re: ngc2289]
      #5836818 - 05/02/13 05:39 PM

Well before I do something stupid I am going to ask for information. I need to relocate the baffle in my Tasco, and to do so I need to remove the lens cell from the tube. I tried to take the cell off by hand but that was a no go. So I have purchased a strap wrench to loosen the lens cell. But before I start cranking on the cell one simple question. The lens cell is threaded onto the tube, and not attached in some other way? Just want to make sure before I break something! Also by how much should I move the baffle? Thank you!!

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ngc2289
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Re: Fair price for Unitron 75mm f/16 Objective. new [Re: ngc2289]
      #5837542 - 05/03/13 01:00 AM

Well I answered my own question, and yes the lens does screw off. Now I think I will move the baffle about 2" closer to the focuser, and flock the front of the tube. Clear evening skies.

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starman876
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Re: Fair price for Unitron 75mm f/16 Objective. new [Re: ngc2289]
      #5837805 - 05/03/13 08:36 AM

I have been thinking myself how do I make sure the baffles are in the right spot. Most likely ray tracing is the way to go. However, I do not have that program. Anyone here have a program they can recommend?

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ngc2289
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Re: Fair price for Unitron 75mm f/16 Objective. new [Re: starman876]
      #5838274 - 05/03/13 12:26 PM

The method I am using is to put the diagonal, and eyepiece turret in the focuser. Then I rack the focuser out to where the eyepieces focus then look into the aperture where the eyepiece is placed. When I did the afore mentioned I could see about 55mm to 60mm of the central part of the lens. So the baffle is acting like a aperture stop at it's present location, and needs to be moved.

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terraclarke
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Re: Fair price for Unitron 75mm f/16 Objective. new [Re: starman876]
      #5838345 - 05/03/13 01:00 PM

Quote:

I have been thinking myself how do I make sure the baffles are in the right spot. Most likely ray tracing is the way to go. However, I do not have that program. Anyone here have a program they can recommend?




Neither do I. You can always do a ray trace the old fashioned way with proportional triangles. Just get out the old drafting board, T-square, right triangle, engineer's scale, and a pair of dividers. That's the way I do it.


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ngc2289
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Tasco 10K Second light. new [Re: ngc2289]
      #5842470 - 05/05/13 09:15 PM Attachment (13 downloads)

Right now I have the 10K outside waiting for sun set, and second light. First light was two weeks ago. Since first light I have moved the baffle 2" closer to the focuser, and flocked the scope interior. Pictures follow. That is all.

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ngc2289
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Re: Tasco 10K Second light. new [Re: ngc2289]
      #5842473 - 05/05/13 09:17 PM Attachment (10 downloads)

Pic. 2

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ngc2289
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Re: Tasco 10K Second light. new [Re: ngc2289]
      #5842474 - 05/05/13 09:17 PM Attachment (7 downloads)

Pic. 3

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ngc2289
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Re: Tasco 10K Second light. new [Re: ngc2289]
      #5842477 - 05/05/13 09:18 PM Attachment (5 downloads)

Pic. 4.

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ngc2289
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Re: Tasco 10K Second light. new [Re: ngc2289]
      #5842481 - 05/05/13 09:19 PM Attachment (14 downloads)

Pic. 5, and end.

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UND_astrophysics
sage


Reged: 01/19/13

Re: Tasco 10K Second light. new [Re: ngc2289]
      #5851224 - 05/10/13 01:03 AM

Very nice setup!!!

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ngc2289
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Re: Tasco 10K Second light. new [Re: UND_astrophysics]
      #5851233 - 05/10/13 01:10 AM

Thank you. I am enjoying it greatly weather permitting!

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terraclarke
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Re: Tasco 10K Second light. new [Re: ngc2289]
      #5852190 - 05/10/13 02:59 PM

Great job Mike! Looking forward to hearing how second light went.

Terra


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ngc2289
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Re: Tasco 10K Second light. new [Re: terraclarke]
      #5852499 - 05/10/13 06:39 PM

I have yet to have a night of good seeing so I can test the optics. Saturn did look nice even with the poor seeing. I could see some structure on the face of the planet, and Casini's division faintly. But like I said seeing was not that good.

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starman876
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Re: Tasco 10K Second light. [Re: ngc2289]
      #5852663 - 05/10/13 08:04 PM

Vrey nice looking setup. Congrats on a great job.

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