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Fishy $1 Unitron?

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30 replies to this topic

#1 Glassthrower

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Posted 30 March 2007 - 09:51 AM

http://cgi.ebay.com/...em=170096315535

A 62mm Alt-Az Unitron. Opening bid $1. No reserve.

The objective cell looks curious to me. I thought all Unitrons had adjustable cells with letting or text around the cell - Unitron, focal length, etc. This cell looks plain and unadjustable. Is it a replacement cell? Non-Unitron? Is this an older, uncoated, Unitron cell?

I'm tempted to consider bidding at some point, but I am suspicious of the objective cell.

Regards and clear skies,

MikeG

#2 Mr Magoo

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Posted 30 March 2007 - 10:03 AM

I emailed the seller and asked if there were any model numbers on anything or literature with the scope and they said no.

#3 Calypte

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Posted 30 March 2007 - 10:31 AM

I can't quickly locate a Unitron ad showing the 2.4-inch refractor on an alt-az mount, but otherwise the scope looks completely authentic to me.

#4 Glassthrower

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Posted 30 March 2007 - 11:03 AM

I did an AM search and I found some 62mm Unitron Alt-Az kits, but none had a cell that looked like this one.

Regards and clear skies,

MikeG

#5 Mr Magoo

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Posted 30 March 2007 - 01:24 PM

$1 didn't last long. What is this scope worth?

#6 Bob W6PU

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Posted 30 March 2007 - 01:36 PM

It's hard to get excited about all these 60mm scopes, whose objectives are smaller than my binoculars! :lol:

Bob
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#7 Glassthrower

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Posted 30 March 2007 - 01:43 PM

I guess I find these little Unitrons interesting because they are priced low enough for someone in my financial strata to actually consider purchasing one. I'd like to observe with one and see how good the optics really are, compared to the modern Chinese achromats I have tried.

Regards and clear skies,

MikeG

#8 Awesomelenny

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Posted 30 March 2007 - 02:30 PM

I saw that too on eBay. That was the first thing I noticed was the objective cell. It's not only non-collimatable but that cell is not any Unitron I have seen. There are a couple of people here on CloudyNights that WOULD know though...I am not one of them!

#9 Mark Lancaster

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Posted 30 March 2007 - 03:38 PM

What about the dew shield? It looks like the "band" at one end is made from PVC...?

#10 trainsktg

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Posted 30 March 2007 - 03:47 PM

It's hard to get excited about all these 60mm scopes, whose objectives are smaller than my binoculars! :lol:

Bob
10" F/5 Treckerscope, circa 1956

11x80 Vixen
15x70 Oberwerk


Its not the size that counts, its how you use it. :whistle:

Keith (at least, that's what I've heard)

#11 highertheflyer

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Posted 30 March 2007 - 04:08 PM

The dew cap does appear to be PVC and I sent a message asking if there were any plastic parts at all on the telescope.
Also, the white mounted cradle attached to the side of the telescope with two bolts does not look correct.
Have never seen a Unitron with anything but black cradle rings.
Jim #610 Unitron

#12 highertheflyer

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Posted 30 March 2007 - 04:34 PM

Just got a reply from the Unitron salesperson concerning the plastic parts. Quote "MAJOR MISTAKE-- WE ASSUMED ALL THE TELESCOPE IS MADE OF METAL, AND THE FRONT AND BACK BLACK PIECES ARE INDEED MADE OF PLASTIC- IT WILL BE DULY NOTED ON THE LISTING."

#13 Bonco

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Posted 30 March 2007 - 04:51 PM

I've never seen a Unitron with those side mounts on the tube.
The mount looks like it might be the real deal but not the tube.
Bonco

#14 BHunt

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Posted 30 March 2007 - 06:03 PM

This unit looks exactly like me selsi unitron. Bet it has screws in the side of the front objective!
Bill

#15 trainsktg

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Posted 30 March 2007 - 07:08 PM

I've never seen a Unitron with those side mounts on the tube.


That isn't a side mount. Unless I'm mistaken, the focuser has only one knob and the single tube mount is on the bottom of the OTA, which would then attach nicely to the mount shown.

Keith

#16 BHunt

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Posted 30 March 2007 - 07:34 PM

I am talking about the front lense , Mine does not unscrew from the tube. Still havent figured out how to get it off. I dont want to take the screws out cause I can see the nuts on the inside of the tube. If the nuts fall off how will I ever get it screwed back in. Check the pics I posted Unitron Staten Island
Bill :john:

#17 Mark Lancaster

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Posted 30 March 2007 - 08:12 PM

Bill,

I had the same problem when I disassembled my 3-inch Unitron. I removed the dew shield with these wrenches I bought from Lowes:

http://www.lowes.com...535-16878-40112

After the dew shield was out of the way, I gently removed the lens from the cell, noting orientation marks. Then the screws and nuts were accessible.

Hope this helps.

Mark

#18 BHunt

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Posted 30 March 2007 - 08:31 PM

Thanks Mark,
But here is the actual problem. See the screws that go through the front objective. And in the second picture you can see the nuts inside the tube. If I unscrew the bolt the nut comes off How can I get the objective back together.
Bill

Attached Thumbnails

  • 1516022-unitron,selsi 002 (WinCE) (2).jpg


#19 BHunt

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Posted 30 March 2007 - 08:32 PM

nut inside tube- Had a Army General ask me one time how I pulled it off, you had the screws put to you, told me I must be a nut. Now I have both nuts and screws and dont know what to do! I surrender. :twitch:

Attached Thumbnails

  • 1516025-unitron,selsi 003 (WinCE) (3).jpg


#20 mikey cee

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Posted 30 March 2007 - 09:28 PM

Bill Sounds like the ol' ship in the bottle routine to me. I guess you could get the nut out of the tube after you pull the lens cell off. Just deal with one problem at a time. If you paint yourself into a corner just get rich parting it out! :smirk: :grin: Mike

#21 trainsktg

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Posted 30 March 2007 - 09:31 PM

Um, is there a retaining ring at the front of the objective? Perhaps that comes off, the lenses come out, then the cell comes off. Sounds weird, but maybe...?

Keith

#22 2manyscopes

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Posted 30 March 2007 - 09:39 PM

Thanks Mark,
If I unscrew the bolt the nut comes off How can I get the objective back together.
Bill


Hi Bill,
Assuming that you can get the screws out without the nuts spinning there are two ways I know of that you could use to reassemble the beast.

The simplest method would be to lightly glue the nuts in place on the inside of the tube. When dry just put it back together. Another more costly (unless you have the tool) method would be to use a set of mechanical fingers to hold the nut from the focuser end. You could even kluge together a simple device on the end of a wooden dowel to hold the nut. Just remember to keep the OTA tilted so that nothing can fall towards the objective.
Bill

#23 mikey cee

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Posted 30 March 2007 - 09:46 PM

Bill.... I'm betting the nuts are bonded to the tube with some kind of weld or epoxy. I've seen it done before on hard to service items over the years! ;) ;) Mike

#24 BHunt

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Posted 30 March 2007 - 09:46 PM

Thanks Mike,
Even though the front objective is dirty this scope gives some fantastic views, some of the best I have seen. I am new to astronomy and can tell an m14 from a m16 rifle but as far as those same star numbers go I have alot to learn. The views of the moon with this scope are incredibile. I would not have the heart to part it out.
Bill

#25 BHunt

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Posted 30 March 2007 - 09:58 PM

Thanks guys,
Keith I cant get the retaining ring to move. Bill the nuts spin but I got it tightened back up.I probably could get them off and use an apoxy to hold the nut in place but then I am worried about collimation.
Bill


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