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What is this crystal formation in the lens? |
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WJC
Optics Journeyman Joined: May/28/2014 Location: Twin Falls, ID Status: Offline Points: 328 |
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Posted: March/29/2018 at 14:35 |
They don't cover anything before WWII and may point out that the lens was subjected to direct sunlight. You'll have to call. Bill Edited by WJC - March/29/2018 at 16:44 |
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WJC
Optics Journeyman Joined: May/28/2014 Location: Twin Falls, ID Status: Offline Points: 328 |
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The objective of most binoculars consists of a crown and a
flint element—usually Bk7 and F2 or F4. They are cemented together with Canada
Balsam (not “Canadian” Balsam) or Norland 61 thermosetting adhesive. Some
people say that the elements set with Norland are difficult to get apart.
However, I find a 4-pound shop hammer on a concrete slab works wonders. The
lens can never be used again but the stress relief is great. As you might guess
working with Norland takes a great deal of patience.
There is a good chance that the reason you haven’t seen this before is that you haven’t worked with binos every day for decades. Cheers, Bill |
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“Water, water everywhere nor any drop to drink.” — Samuel Taylor Coleridge
“Social media everywhere but not a thought to think.” — me |
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Sparky
Optics Master Extraordinaire Joined: July/15/2007 Location: SD Status: Offline Points: 4569 |
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If it is the elements of his objective beginning to separate. Wouldn't that possibly be covered by Zeiss's warranty? Or was the warranty different in the 80s?
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sucker76
Optics Journeyman Joined: June/13/2013 Location: Texas Status: Offline Points: 392 |
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No offense I'll offer anything if I think it helps. I'm a little south of Houston.
When you say elements separating are you talking about the lens coating or the actual glass lenses ungluing themselves from each other? I've never seen anything like it on an optic. |
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Stamp collecting since 2015
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WJC
Optics Journeyman Joined: May/28/2014 Location: Twin Falls, ID Status: Offline Points: 328 |
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Hi, Skip:
'Never been gone. OT is one of the forums I keep open on my "Big Mac." Bill |
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“Water, water everywhere nor any drop to drink.” — Samuel Taylor Coleridge
“Social media everywhere but not a thought to think.” — me |
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Peddler
Optics God Joined: July/04/2012 Location: Oswego,NY Status: Offline Points: 13532 |
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Nice to see you back Bill.
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When you are dead, you don't know you are dead.It is difficult only for others.
It is the same when you are stupid. |
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WJC
Optics Journeyman Joined: May/28/2014 Location: Twin Falls, ID Status: Offline Points: 328 |
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Thanks guys: Having two moderators in a row like something I said is refreshing. It seems there’s always some who think I should offer touchy-feely, milquetoast comments so not to offend the soft hearted ... or headed. I get the impression some think I should be ashamed of the experience I have that others don’t. I didn’t set that as a goal; it just came with loving my profession. But there’s no way to have spent decades in optics, and knowing what you are talking about, without being (to some) an arrogant know-it-all. Even so, those who come to such a conclusion have not walked in my shoes having spent 21 of those years addressing the many misconceptions about optics in general and binoculars in particular—a few times a day EACH workday. Thus, they can’t really understand that even my bullheaded methods are not always remembered. And the more politically correct you are the less likely you are to be taken seriously, considering binocular forums consist largely of one bad “opinion” after another. My whole shtick is to help my neighbor—sometimes saving him from himself. But then, with unfounded pontifications being easier to deal with than first-hand experience or research, I guess I will be easy pickin’s for those who thrive on thoughtless speculations ... no matter who it hurts. This topic wasn’t a lucky call. It was something we learned about—and how to correct—in the Navy’s optical “A” school and rarely a week went by at Captain’s without having to address the problem ... often having to explain to the customer why you just couldn’t “polish out” the problem, because it was sandwiched between two cemented lenses. “Deer in the headlights.” Sorry for being overly sensitive. It’s just that I’m dealing with such an issue at this very moment on Cloudy Nights. Vicariously of course, since I’m not allowed to play. Blessings, Bill PS With an objective focusing at the field stop, turning it toward the sun to remove the fungus (that wasn’t a fungus at all) might have melted part of that field stop, had it been made of plastic. I’ve seen that more than once. Having said that, I doubt if Phil is offended—he’s on Optics Talk, which says a great deal about his resiliency as does being a Texan. Phil, what part of Texas? Edited by WJC - March/26/2018 at 14:15 |
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“Water, water everywhere nor any drop to drink.” — Samuel Taylor Coleridge
“Social media everywhere but not a thought to think.” — me |
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tahqua
MODERATOR Have You Driven A Ford Lately? Joined: March/27/2006 Location: Michigan, USA Status: Offline Points: 9044 |
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Yes, nice call and very interesting.
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Doug
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RifleDude
MODERATOR EVIL OPPRESSOR Joined: October/13/2006 Location: Texas Status: Offline Points: 16337 |
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Good call, Bill. The shape and stark white color of the anomaly does look more like your example than what you normally see from fungus.
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Ted
Money can't buy happiness... but it's much more comfortable to cry in a Porsche than on a bicycle. |
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WJC
Optics Journeyman Joined: May/28/2014 Location: Twin Falls, ID Status: Offline Points: 328 |
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I think you will find it is NOT a fungus but, rather, the elements of your objective beginning to seperate. Cory can easily fix that. Easy for him, but time consuming. Prepare to spend a little money. Attached is another photo of seperation.
Bill Edited by WJC - March/25/2018 at 17:47 |
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“Water, water everywhere nor any drop to drink.” — Samuel Taylor Coleridge
“Social media everywhere but not a thought to think.” — me |
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sucker76
Optics Journeyman Joined: June/13/2013 Location: Texas Status: Offline Points: 392 |
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I have read that you may be able to clear small amounts of fungus by leaving it in the bright sunlight for a few days.
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Stamp collecting since 2015
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RifleDude
MODERATOR EVIL OPPRESSOR Joined: October/13/2006 Location: Texas Status: Offline Points: 16337 |
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I agree with gunut, it looks like fungus.
Here is some info on fungus on optical lenses: |
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Ted
Money can't buy happiness... but it's much more comfortable to cry in a Porsche than on a bicycle. |
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gunut
Optics Apprentice Joined: March/17/2016 Location: Wisconsin Status: Offline Points: 59 |
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looks like a fungus to me....get it cleaned ....or it will etch the glass....
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gunut
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foursquare
Optics GrassHopper Joined: November/09/2016 Status: Offline Points: 9 |
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