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Odd,old 1.25" eyepiece

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#1 mdowns

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Posted 12 January 2013 - 07:50 PM

I found three old eyepieces at a flea market today. Two were obviously microscope eyepieces but the one that most interest me was the heavy,brass,1.25". There are no makers mark,country of origin IDs,nothing. It has a very sharply defined field stop and about a 50* afov. For the 15 bucks for the three I figured I could'nt go wrong,besides I have a couple of spare 1.25" barrels for the two micro pieces. Any ideas on the brass piece?

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#2 mdowns

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Posted 12 January 2013 - 07:51 PM

heres one more

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#3 Grava T

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Posted 12 January 2013 - 08:21 PM

Not sure what the brass one is but the other two might be from a spotting scope, not a microscope. Hard to tell though from the pics. Nice find BTW.

#4 mdowns

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Posted 12 January 2013 - 09:29 PM

Thanks Michael, I hav'nt given that a thought.Perhaps your right,but if so,what spotter:-). I'd love to know the orgins of all three.

#5 refasali

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Posted 12 January 2013 - 09:33 PM

Looks to be a commercially surplused or homemade (w/ surplus parts) ep. As far as I know.

#6 Jon Isaacs

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Posted 12 January 2013 - 11:58 PM

heres one more


:goodjob:

Good find.. I love those old eyepieces... never use em but I love em just the same.

Jon

#7 mdowns

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Posted 13 January 2013 - 08:03 AM

First chance I get I'm going to do side by side comparisons with my current eyepieces.Of course non of these three have coatings but it will be fun to see how flat the fields are(or are not),how well they define details.

#8 Mike E.

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Posted 13 January 2013 - 10:03 AM

Not sure, but it kind of reminds me of an eyepiece for a WW II gyroscopic bombsight. :question:

#9 mikey cee

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Posted 13 January 2013 - 11:24 AM

Looks like an old 1-1/4" kellner from Jaegers. The focal length was 1-1/4" also. Same profile. ;) Mike

#10 Hikari

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Posted 13 January 2013 - 12:30 PM

What ever they are, they were mated to a specific instrument--hence the magnifications on the side. Personally, I have never seen microscope objectives like that, not only are the magnification unstandard for microscopes, the attachment looks strange as well--why do you think there are for microscopes? The unmarked one could be a barlow.

#11 mdowns

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Posted 13 January 2013 - 05:03 PM

I've seen many microscope eyepieces marked this way in the past.If you go on ebay and look for microscope eyepieces you'll find a large number coming out of europe so marked.Dos'nt mean thats what those two are and all the input is appreaciated.One has a small diamete barrel(.96),common to micros, the other no barrel.The unmarked(1.25) is no barlow.I think I'll post some better pics of each a bit later.I agree that the two seem to belong together,as if in a set.Thanks for pitching in!

#12 mdowns

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Posted 13 January 2013 - 08:36 PM

Heres some more detailed pics of the three.

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#13 mdowns

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Posted 13 January 2013 - 08:37 PM

another of the 1.25

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#14 mdowns

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Posted 13 January 2013 - 08:39 PM

the 13x showing the barrel

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#15 mdowns

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Posted 13 January 2013 - 08:39 PM

one more of the 13x

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#16 mdowns

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Posted 13 January 2013 - 08:40 PM

the 20x

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#17 mdowns

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Posted 13 January 2013 - 08:41 PM

finally all three with 1.25 barrels added to the 13x and 20x

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#18 BillC

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Posted 13 January 2013 - 10:55 PM

Hi Michael:

Several years ago, there were a number of companies marketing threaded EPs like the first two. They are definitely not microscope EPs. In the magnifications shown, Swift, Bushnell and Kowa Prominar come to mind.

The 3rd piece looks VERY familiar. But, to NAIL it down for you . . . I can’t! Sorry.

Some things appear to be what they’re not. When I was in the optics shop at Ft. Lewis, we were visited to a couple of “guru’s” from Tobyhanna, Pennsylvania . . . the keepers of ALL the Army’s night-vision knowledge.

The auxiliary scopes they brought with them (to teach us our jobs on the AN-PVS-6) were taught to us as newly developed instruments. THEY WERE, IN FACT, THE FINDER SCOPES OFF A RUSSIAN-MADE 6-INCH NEWTONIAN TELESCOPE. They didn’t know, and our guys didn’t care.

Cheers,

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#19 mdowns

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Posted 14 January 2013 - 06:36 AM

Thanks Bill! Glad I did'nt ask the guys from Tobyhanna.Above Michael first suggested and Hikari as well what you have confirmed about the two. Hopefully someone might recognize those exact pieces and share what spotter they came from.The two sets of threads near the eye lens of the brass piece still has me wondering.

#20 Hikari

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Posted 14 January 2013 - 12:42 PM

I've seen many microscope eyepieces marked this way in the past.


Yes, microscope objectives are marked with magnification. But 13X is not your standard magnification for a microscope--most common are 5x, 10x, 15x, and 20x. The reason is scale is important and trying to imagine what 13x is a bit odd--why not 10x or 15x?

I work professionally with microscopes and have a great deal of experience with them. That does not mean that there are strange instruments, but it is not "obvious" to me that those come from a microscope.

#21 mdowns

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Posted 14 January 2013 - 06:39 PM

Hikari,
I'm beginning to believe my opinon was biased by the microscope condenser assembly lying on the table besides these.Actually all four items were sitting in a group together.I only wanted the eyepieces.Folks like yourself and Bill C,those who have made a living among optics,are what makes these forums such a valueable source of information.Still would love to know what spotter those two came from.Its clear here tonight so I'm hopeing to try all three out in the scope.

#22 BillC

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Posted 14 January 2013 - 08:49 PM

"Folks like yourself and Bill C,those who have made a living among optics"

Trust . . . but verify ANY opinion; we're not infallible. I remember that time I made a mistake . . . back in '58, I believe. :idea:

BillC

#23 mdowns

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Posted 14 January 2013 - 11:16 PM

HA! Your wrong Bill,it was 57 :lol: ! I got to compare these with my brandons and antares elites tonight.The one labeled 13x seems to be in the 36-38mm range and surprisingly was the poorest of the three,images falling off in the outer ten percent of the fov. Both the brass piece (32mm) and the one labeled 20x (around 22mm) performed very well with tight stars over about 95 percent of the fov. In side by side comparisons with comparable fls these two did very well overall. The lack of coatings was of course thier biggest handicapp and was apparent when viewing very faint stars.Definition seemed similar but could'nt really be judged because of the unsteady air.I'll try again later in the week as the moon matures.

#24 mdowns

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Posted 20 January 2013 - 09:44 PM

The air has been unsteady all week but I shot some afocal pics tonight with the brass eyepiece including this one,hand held through the c11

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#25 Rich (RLTYS)

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Posted 21 January 2013 - 06:47 AM

Looks good.

Rich (RLTYS)






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