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REALLY GIANT BINS!

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#1 thane

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Posted 22 May 2005 - 09:12 PM

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THAT'S A RULER ON THE FLOOR!

I picked these up yesterday from government surplus. I have bought and sold many aerial photography lenses before, but none were EVER this big.

These are a perfectly matched set of 10” clear aperture f/6.3 lenses.

My guess is they are a matched set for hi-res stereoscopic imagery. They look to be from the 1960s and have altitude adjustments that go up to 60,000 feet. I think the only things flying that high were the U-2 and SR-71.

I have always been discouraged from attempting astronomy applications with aerial lenses due to their fast f/2-4 nature. But, at f/6.3, these might work? I also think one of the adjustment knobs is for the rear lens element for up to f/22. The glass is nearly perfect (also rare for aerial lenses).

Any Ideas?

I have more photos here: Click Here

#2 Glassthrower

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Posted 22 May 2005 - 10:11 PM

These are a perfectly matched set of 10” clear aperture f/6.3 lenses.


Wow, that's a nice find....does somebody smell a binoviewer in the making?

Mike

#3 Guest_**DONOTDELETE**_*

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Posted 23 May 2005 - 06:40 AM

And how much do those things weigh each? They look mighty heavy.

BTW, your (and mine) BT100 is f/6.3.

#4 btschumy

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Posted 23 May 2005 - 07:26 AM

Very interesting find. Just out of curiosity, about how much did you pay for these?

#5 thane

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Posted 23 May 2005 - 09:47 AM

They are pretty heavy... about 100 lbs each. Most of the mass is in the housing, but I think I'll leave them in the housing. At first glance it seems that you could put an eyepiece/prism at a fixed position, because it has very smooth gearing and bearings that translate the front objective for focusing. The objective moves about 1.5 inches. I don't know what that means in focus range, but for infinity focusing that would probably be plenty.

Bill,
I knew someone would ask how much...:grin: I am a cheap SOB so not much. Let's just say "I'm a bottom feeder". :grin:

#6 Glassthrower

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Posted 23 May 2005 - 10:38 AM

They are pretty heavy... about 100 lbs each.


Holy cow! That's almost toooo heavy. Are the housings sealed and pressurized? If not, then it doesn't really pay to keep the bulky housings. Salvage the lenses and scrap the 40-ton enclosure. However, if they are sealed tight and pressurized with some kind of gas, then it might be wise to leave them intact and just deal with the weight.

Keep us posted on what you do with them, I'm curious.

Mike

#7 thane

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Posted 23 May 2005 - 11:09 AM

I can see my next surplus purchase now...

http://riv.co.nz/rnz...cal/qf37aa1.htm ;)

#8 Guest_**DONOTDELETE**_*

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Posted 23 May 2005 - 11:39 AM

Whew, that's heavy. Well have fun with them!

#9 Craig Simmons

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Posted 23 May 2005 - 11:50 AM

That should make a good mount for them and portable too!

#10 thane

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Posted 23 May 2005 - 11:56 AM

If you can believe it, some people "claim" that I'm unrealistic. Maybe I am, but it's FUN!

#11 Glassthrower

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Posted 23 May 2005 - 12:31 PM

If you can believe it, some people "claim" that I'm unrealistic. Maybe I am, but it's FUN!


No, it's not unrealisitic, it's just a terminal case of "apeture fever"! I having a raging case of it myself and I am itching to build something. I have a full workshop outside in the garage and it's time to start cranking out some astro equipment. I had never really thought to consider the military surplus market, I'll have to look into that when it comes time to pull the trigger on something...

I can see my next surplus purchase now...

http://riv.co.nz/rnz...cal/qf37aa1.htm

QF 3.7-in heavy anti-aircraft gun on mobile mounting.
Click image to return to article on the QF 3.7-in anti-aircraft gun at Waiouru.


Here's what you do, salvage the long barrel on that AA gun and make a refractor out of it! :silly:

Mike

#12 thane

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Posted 05 July 2005 - 01:14 PM

My odyessey with these has been fun... see eBay items 7528673301 and 7528675928 for a full explanation of where they came from.

EdZ, I know this is little borderline, but I think it will be fun info for forum members. I think large format camera buffs will outbid any astro buffs anyway.

#13 zdravko

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Posted 08 July 2005 - 07:11 AM

Congratulations on your lenses.I have beeen daydreaming of having such a big bino for some time now.I hope you build one soon.Kep us posted please.
You can see similar project here.
http://homepage2.nif...ino/index-e.htm
C.S. Zdravko

#14 jwaldo

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Posted 08 July 2005 - 09:14 PM

:lol: Where can I get a pair? :help:


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