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Equipment Discussions >> Classic Telescopes

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apfever
Carpal Tunnel
*****

Reged: 05/13/08

Loc: Colorado
Re: how to store vintage eyepieces new [Re: apfever]
      #5753871 - 03/24/13 12:42 PM Attachment (11 downloads)

MMM, I like kimchi too, haven't tried the ep version.

LAST POST (yeayyyy?) and a rare one. This one eyepiece is rather highly radio active, seriously, made with Thorium in the glass. Tested with a Geiger counter. The metal fabric lined sack in the box is original military issue. I store this with the extra foil wrap around it, in another box, in the basement....


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sgorton99
Post Laureate
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Reged: 04/30/08

Loc: Wisconsin, Madison
Re: how to store vintage eyepieces new [Re: apfever]
      #5753880 - 03/24/13 12:46 PM

Neil, you should keep that eyepiece in your pocket 24/7 to keep a close eye on it...

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Joe Cepleur
Carpal Tunnel


Reged: 03/18/10

Loc: Dark North Woods
Re: how to store vintage eyepieces new [Re: apfever]
      #5754005 - 03/24/13 01:33 PM

Quote:

Thorium in the glass




What is the point of that? Sounds deliberate, if it comes in a metal-wraped bag.


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Sean Cunneen
Let Me Think
*****

Reged: 08/01/07

Loc: Blue Island Illinois
Re: how to store vintage eyepieces new [Re: Joe Cepleur]
      #5754028 - 03/24/13 01:39 PM

I like to keep mine in vintage instrument cases(which are quite fun to collect on their own!). I am especially fond of optical comparator cases, as they were very expensive back in the day. Consequently construction and woods are top-notch.

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dgreyson
professor emeritus
*****

Reged: 11/06/12

Loc: South Carolina
Re: how to store vintage eyepieces new [Re: Joe Cepleur]
      #5754183 - 03/24/13 02:33 PM

Quote:

Quote:

Thorium in the glass



What is the point of that? Sounds deliberate, if it comes in a metal-wraped bag.




By adding thorium to the glass, a high refractive index (over 1.6) can be achieved while maintaining a low dispersion. Self-irradiation of the lens leads to a gradual darkening of the glass that reduces light transmission over time. As a result, it is not unusual to see a reddish brown color to the originally clear glass of older lenses.

Thoriated lenses were ok for Cameras, but are not really a good idea for an eyepiece where you keep it in close contact with your eye. If the eye is positioned close to a thoriated eyepiece, the dose to the eye’s outer tissues can be substantial. Casarett et al, assuming that an individual used an eyepiece containing 16% thorium for 20 hours per week, estimated a dose of 44 rad at a depth of 50 um, and 18 rad at a depth of 60 um. Given a quality factor of 20, this would equate to 880 rem and 360 rem per year respectively. Similar calculations by McMillan and Horne were in general agreement with these numbers. One measurement, as opposed to a theoretical calculation, indicated a dose rate of approximately 1 mrad/hr at the surface of an eyepiece containing 18% thorium.
-- Oak Ridge Associated Universities: Radioactive consumer products.


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Joe Cepleur
Carpal Tunnel


Reged: 03/18/10

Loc: Dark North Woods
Re: how to store vintage eyepieces new [Re: apfever]
      #5754723 - 03/24/13 06:51 PM

Quote:

By adding thorium to the glass, a high refractive index (over 1.6) can be achieved while maintaining a low dispersion...




I see, thanks. Sounds like a radioactive version of modern ED glass!

Quote:

Lay them on their sides...




Great idea for keeping the glass clean. Have you ever had them roll off the shelves? I suppose if handled carefully, they would roll only sideways, not forward and off.

I keep my oculars in a Tupperware box. Inside the Tupperware are cardboard boxes, some filled with bolt cases, others with oculars in zip-lock bags. The bags not only keep things clean, but also prevent scratches. Concerns about locking in moisture are valid. I always allow mine to dry before zipping them away.


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mustgobigger
Postmaster
*****

Reged: 06/12/07

Loc: Michigan
Re: how to store vintage eyepieces new [Re: Joe Cepleur]
      #5767637 - 03/30/13 09:20 PM Attachment (8 downloads)

found this today ($20.00) and this post came to mind right away...
since we dont have very many earthquakes around here
i think ill be fine.


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mustgobigger
Postmaster
*****

Reged: 06/12/07

Loc: Michigan
Re: how to store vintage eyepieces new [Re: mustgobigger]
      #5767640 - 03/30/13 09:21 PM Attachment (8 downloads)

should look ok on the telescope room wall.
holds 108


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buddyjesus
Carpal Tunnel
*****

Reged: 07/07/10

Loc: Davison, Michigan
Re: how to store vintage eyepieces new [Re: mustgobigger]
      #5767758 - 03/30/13 10:28 PM

pretty mustgobigger

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The Ardent
scholastic sledgehammer
*****

Reged: 10/24/08

Loc: Virginia
Re: how to store vintage eyepieces new [Re: buddyjesus]
      #5767894 - 03/30/13 11:43 PM

What is it?

All glass?


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mustgobigger
Postmaster
*****

Reged: 06/12/07

Loc: Michigan
Re: how to store vintage eyepieces new [Re: The Ardent]
      #5767900 - 03/30/13 11:50 PM

Plexiglass with mirror on back.

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Rich (RLTYS)Moderator
Post Laureate
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Reged: 12/18/04

Loc: New York (Long Island)
Re: how to store vintage eyepieces new [Re: mustgobigger]
      #5768162 - 03/31/13 07:25 AM

Wow, now it will look like you have TWICE as many eyepieces.

Rich (RLTYS)


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Dave M
Postmaster
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Reged: 08/03/04

Loc: Ohio
Re: how to store vintage eyepieces new [Re: Rich (RLTYS)]
      #5768251 - 03/31/13 08:50 AM

Looks Nice, now you just need a plexiglass door on the front
that`s hinged or slides, to keep the dust off the eyepieces.


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Da Bear
scholastic sledgehammer
*****

Reged: 11/21/06

Loc: Kali-Forn-Ya
Re: how to store vintage eyepieces new [Re: Dave M]
      #5768284 - 03/31/13 09:24 AM Attachment (8 downloads)

I thinned the herd and now I'm now under 50 or so of the little buggers. 30 or so are high end, collectable eyepieces; the others are an eclectic mixture of what ever I happen to take a shine to on CN classified and that other site. Mostly I use bolt cases inside a foam lined Pelican cases. I also rotate a dozen or so every few month into a spot lit display case in my office. / man cave / writing room. They sit next to my collections of petrified wood, minerals, Native American pottery, Asian pottery, arrowheads, brass carriage clocks, and few 18th century pieces of dark blue Wedgwood.

No eyepeices in this older pic. but a really great Celestron Orange 6x30 finder that has a sentimental attachment for me.

Da Bear

Edited by Da Bear (03/31/13 09:29 AM)


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mustgobigger
Postmaster
*****

Reged: 06/12/07

Loc: Michigan
Re: how to store vintage eyepieces new [Re: Dave M]
      #5768948 - 03/31/13 02:43 PM

Quote:

Looks Nice, now you just need a plexiglass door on the front
that`s hinged or slides, to keep the dust off the eyepieces.




There is a hinged door on it ...
Look close on left side.

If it looks like doubles ill have a nice
set for my binoviewers......


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starman876
Post Laureate
*****

Reged: 04/28/08

Loc: VA
Re: how to store vintage eyepieces new [Re: mustgobigger]
      #5770507 - 04/01/13 11:04 AM

Talking about the ground shaking. We had an earthquake near here last year. I was in a meeting and the whole room was moving. I was really worried because I had a number of Unitron scopes just sitting up in the air on the dew shield. When i got home they were all still standing. they are all packed away in the case now. However, I stand the cases on end for the larger Unitrons to save space.

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Dave M
Postmaster
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Reged: 08/03/04

Loc: Ohio
Re: how to store vintage eyepieces new [Re: mustgobigger]
      #5770575 - 04/01/13 11:36 AM

Ahh!, i see the hinges now that you pointed them out.
Should look real nice on the wall, did you find that at an auction ?


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mustgobigger
Postmaster
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Reged: 06/12/07

Loc: Michigan
Re: how to store vintage eyepieces new [Re: Dave M]
      #5771046 - 04/01/13 03:21 PM

Estate sale...went to buy jewelry
For patsy looked in the corner
And I could picture it full of vintage
Eyepieces ....of course I offered
Less than tag.


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starman876
Post Laureate
*****

Reged: 04/28/08

Loc: VA
Re: how to store vintage eyepieces new [Re: mustgobigger]
      #5771145 - 04/01/13 04:34 PM

Way to go Brian. Never pay retail

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Dave M
Postmaster
*****

Reged: 08/03/04

Loc: Ohio
Re: how to store vintage eyepieces new [Re: mustgobigger]
      #5774916 - 04/03/13 08:58 AM

Quote:

Estate sale...went to buy jewelry
For patsy looked in the corner
And I could picture it full of vintage
Eyepieces ....of course I offered
Less than tag.




Post a pic once you get it hung on the wall and filled


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