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Fair price for Unitron 75mm f/16 Objective.

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74 replies to this topic

#51 Dave M

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Posted 18 April 2013 - 07:45 AM

Very Nice :waytogo:

#52 starman876

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Posted 18 April 2013 - 08:18 AM

Wow another Tasco. Nice. What happened to the 75mm Unitron objective :whistle: :whistle:

#53 ngc2289

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Posted 18 April 2013 - 11:46 AM

The 75mm got too expensive. With shipping the objective was almost as expensive as the entire Tasco. :shrug: :noway:

#54 starman876

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Posted 18 April 2013 - 12:38 PM

I think the last 75mm lens went for $150.

I think the mad craze of bidding is over. Things are back to normal. Evident of tile guy sales. prices are back where they belong.

#55 ngc2289

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Posted 18 April 2013 - 01:08 PM

When I retracted my bid the amount was at $170.51 plus the shipping. :scared: :scared: The Tasco was $180 plus shipping.

#56 starman876

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Posted 18 April 2013 - 01:21 PM

You got a great scope instead of just an onjective. I would be very pleased if I were you. And you most likely have a better scope in the end.

#57 Bonco

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Posted 18 April 2013 - 03:46 PM

The telescope package looks great. Likely the optics will be fine. I think you got it at a bargain price.
Bill

#58 ngc2289

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Posted 19 April 2013 - 09:56 PM

When I was cleaning up what I thought was a Tasco I found this small makers mark! What does it mean?? :scared: :scared: :scared: :scared: :scared: :bigshock: :bigshock: :bigshock: :bigshock: :bigshock: :bigshock: :ohmy: :ohmy: :ohmy: :ohmy: :poke: :poke: :poke: :poke: :poke:

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#59 ngc2289

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Posted 19 April 2013 - 10:02 PM

I forgot to mention it's dated 1868! So I got a really old, and rare scope!!! :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol: :lol:

#60 ngc2289

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Posted 20 April 2013 - 08:57 PM

I have a Vixen SP-80 refractor, and I discovered I can unscrew the 1 1/4" adapter on its focuser. I then removed the .965" tube from the Tasco's focuser, and then screw the Vixen 1 1/4" adapter onto the Tasco. Now I have a 1 1/4" focuser on the Tasco! Although the focuser does have only 1 7/16" travel. Here is a picture of the set-up.

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#61 ngc2289

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Posted 02 May 2013 - 04:39 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!! :question:

#62 ngc2289

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Posted 03 May 2013 - 12:00 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. :)

#63 starman876

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Posted 03 May 2013 - 07:36 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?

#64 ngc2289

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Posted 03 May 2013 - 11:26 AM

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.

#65 terraclarke

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Posted 03 May 2013 - 12:00 PM

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.

#66 ngc2289

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Posted 05 May 2013 - 08:15 PM

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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#67 ngc2289

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Posted 05 May 2013 - 08:17 PM

Pic. 2

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#68 ngc2289

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Posted 05 May 2013 - 08:17 PM

Pic. 3

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#69 ngc2289

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Posted 05 May 2013 - 08:18 PM

Pic. 4.

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#70 ngc2289

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Posted 05 May 2013 - 08:19 PM

Pic. 5, and end.

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#71 UND_astrophysics

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Posted 10 May 2013 - 12:03 AM

Very nice setup!!!

#72 ngc2289

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Posted 10 May 2013 - 12:10 AM

Thank you. I am enjoying it greatly weather permitting! :cloudy: :cloudy: :cloudy: :cloudy: :cloudy: !@#$% !@#$% !@#$% :ohgeeze: :ohgeeze: :ohgeeze: :ohgeeze: :ohgeeze: :ohgeeze:

#73 terraclarke

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Posted 10 May 2013 - 01:59 PM

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

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#74 ngc2289

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Posted 10 May 2013 - 05:39 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. :shrug: :shrug: :shrug: :nonono: :nonono:

#75 starman876

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Posted 10 May 2013 - 07:04 PM

Vrey nice looking setup. Congrats on a great job.


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