Author Topic: Identifying old Barlow lenses  (Read 226 times)

Marvin Alexander

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Identifying old Barlow lenses
« on: December 27, 2017, 12:15:44 PM »
Years ago I was given an assortment of old Barlow lenses and eyepieces (old meaning probably from the 60s or even earlier). While some of the Barlows have identifying marks or are branded (one is a Galoc, another a Criterion), most of them do not. I would say it's likely there are some Edmunds and maybe even a Cave in there, given the other stuff that came with the group, and given that the former owner lived not far from Edmund's HQ in New Jersey. Does anyone know of a resource for identifying specific characteristics that would indicate the maker of a particular unbranded Barlow?

Thanks!
John



Daniel Ferguson

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Re: Identifying old Barlow lenses
« Reply #1 on: December 28, 2017, 01:10:03 AM »
Pics! Hard to identify unmarked objects you can't see.

colidevwi

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Re: Identifying old Barlow lenses
« Reply #2 on: December 30, 2017, 03:32:25 PM »
I knew that was coming. Yes, I'll post some later, but I was asking if anyone knew of a resource - book, website, etc.

Edited to elaborate a bit: I could post pictures of generic black and silver tubes, and it would still likely be hard to ID them. But they have different lenses and components, so I was wondering if there's a resource that would identify those components as being specific to a particular Barlow.

I'll get the pics up later when I have time.

Thanks.

micfullprovlo

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Re: Identifying old Barlow lenses
« Reply #3 on: January 08, 2018, 05:07:00 AM »
Ok, let's try this. First, these are in nicer shape than the photos make some of them look.

Second, I have numbered them, and the number on the bottom is a crude calculation of magnification. I used a proprietary, highly secret method of performing the calculations which I will not reveal at this time  "Crude" is the operative word, but likely fairly accurate. I have tested all 10 and the optics in every one of them were very good, some I'd say even excellent for clarity and resolution.

The end photos are of the bottom end (obviously). Some appear to be adjustable, and have plastic retaining rings in them. Number 10 appears to have a copper tube; number 4 seems to have a copper base; number 5 seems to be black anodized aluminum.








Anton Balderrama

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Re: Identifying old Barlow lenses
« Reply #4 on: January 08, 2018, 05:59:23 PM »
No idea, they look homemade to me. I don't mean that in a bad way...there are some fantastic homemade optics from last century.

Michael Hobbs

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Re: Identifying old Barlow lenses
« Reply #5 on: January 09, 2018, 07:44:44 PM »
I don't think they're homemade. Not all of them, anyhow, esp. the ones with the slots for pressure-fitting eyepieces. I've seen pics of Edmunds and even a Cave that looked very similar to these. I can't imagine that the gentleman I got them from made them.

James Clayton

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Re: Identifying old Barlow lenses
« Reply #6 on: January 10, 2018, 08:03:13 AM »
Quote
...there are some fantastic homemade optics from last century.
Obviously not a reference to my current eyeballs.

Hey John- those Barlows pix certainly take me back! I had one or two, came from the days of my old Edmund Sci 4-1/4" 'flector. IIRC one had a sliding retainer sleeve up inside the barrel where you could vary the optic's spacing for diff Barlow effects.

These look to have seen a photon or three...

consurflola

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Re: Identifying old Barlow lenses
« Reply #7 on: January 10, 2018, 10:51:45 PM »
<<These look to have seen a photon or three...>>

Hey, Mike! Are you insulting my Barlows? They're in better shape than I am!

I was thinking some of them were Edmunds. ES holds a certain mystique for me. I used to get their catalogs as a kid and just pore thru them looking at all the neat science stuff I couldn't afford to buy, till they got wise that I wasn't buying anything and stopped sending them. Was able to visit their store a few times when I lived back east.

Anyhow, yes, some of these do have that "slide factor" and that's one reason I thought they were Edmunds. I found a Cave that had sold on CN some time ago - not sure how the seller knew it was a Cave - but it looked exactly like one of the silver ones. And there were Edmunds that sold too, that had that 3-section look to them that 2 of mine have. Anyhow, it would be neat to know who the makers were.

Hope all's well out your way...

John

opalytun

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Re: Identifying old Barlow lenses
« Reply #8 on: January 10, 2018, 11:59:38 PM »
Just found this thread right here on CN. Definitely some Edmunds, I'd say! I might even have an old Edmund catalog that shows them.

https://www.cloudyni...-out-of-hiding/

Gandza Startley

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Re: Identifying old Barlow lenses
« Reply #9 on: January 11, 2018, 05:41:46 AM »
Quote
Hey, Mike! Are you insulting my Barlows? They're in better shape than I am!
Naw- i'd never do that, John! <'cuz those barlows are in better shape than me, too!>

Never had a Cave or Goodwin, tho i'm sometimes tempted when i see one pop up. But as time creeps forward, i've gradually accumulated more specific EPs best suited to my eyes, skies, & scope... so i think i'm down a Barlow since i last posted on the subject, and the ones i have don't get used quite so often. Yet when ya need one, there's little else that will do!

Life's been a fire drill... with the economy steaming away, i'm getting swamped, as are the roadways of ten-thousand other commuters, all equally swamped. Ya done good, pardner, unplugging as you have & starting up such a kewl endeavor (StarGeezerStuff) with your bride- kudo's to you both!

Clear & steady skies,
mike b

piatimascomp

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Re: Identifying old Barlow lenses
« Reply #10 on: January 11, 2018, 02:14:15 PM »
Well, a bit of sad news here: The husband of the couple who gave me these Barlows years ago, wonderful friends, passed away this morning. He was in failing health for a long time, so it was not unexpected.

Life's been pretty hectic over this way, too. Not much time (or energy) for observing. Besides the two online businesses, we're about to publish a book about a good friend's life with helicopters, in the Army, Navy, Air Force, then civilian. I think it's Hollywood movie material, personally, but that's just me

We're hoping our StarGeezerStuff calendar will strike a chord with astrophiles. The one we did for our Astronomy Club sold out (50 copies) right away and we put a second order in, but we did that as a favor for the Club and are not making anything off those. Everybody likes seeing their photos on a calendar! Including yours truly, of course.

Have a good weekend, Mike, and if you're a veteran, and to all vets out there, thank you for your service to our country!

Gilbert Quintana

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Re: Identifying old Barlow lenses
« Reply #11 on: January 12, 2018, 04:05:00 AM »
Thanks John- i am not, but my Dad & Grandpa both were.

I'll join in thanksgiving & heartfelt appreciation to those who have served, are serving, as well as those who soon will!

Tim Massey

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Re: Identifying old Barlow lenses
« Reply #12 on: January 14, 2018, 07:26:20 AM »
Optical Craftsmen - an optical company of long ago

Todd Vann

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Re: Identifying old Barlow lenses
« Reply #13 on: January 14, 2018, 07:30:23 AM »
Quote
Precision Craftsmen - an optical company of long ago

Do you know where they were located or anything about them?

Sam Noble

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Re: Identifying old Barlow lenses
« Reply #14 on: January 16, 2018, 07:25:29 AM »
So be very carefull, the glass ?maybe? radioactive
I had some info, some where but can't find it right now, i'll keep looking.
The web seems to have forgotten about them. I think california, but that would be from a faint memory.
In their time, they were top tier, they made scopes too.