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Leica 10x50BA -Lens Blemish

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Old Saturday 16th June 2018, 18:06   #1
Merlin
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Leica 10x50BA -Lens Blemish

Hi
I would appreciate any advice.
I have a pair of Leica 10X50 BA and there is a blemish what would appear to be on the outside of one of the objective lens, it resembles an opaque 'bubble'. I have tried to clear with the normal cloths and cleaners but it has no effect, this makes the Binoculars unusable as the view is distorted by the blemish.
I would appreciate any advice and/or any information where I can have them examined/repaired.

Thanking you in anticipation

regards

Merlin
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Old Saturday 16th June 2018, 18:36   #2
Troubador
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If they are very recently bought as new, take them back to the dealer and ask for a replacement, if they are older or secondhand but within the warranty period, contact Leica UK, and if they are out of warranty contact:
http://binocular-repair.co.uk/

Gary Hawkins who runs this repair company has worked for Leica (and Zeiss) and is the official repairer for Zeiss UK. He knows Leicas inside out and is the right man for the job.

Good luck.

Lee
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Old Saturday 16th June 2018, 18:40   #3
Merlin
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Hi Lee

They are like me quite old and world travelled,

Thanks for the advice and info.

best regards
Merlin
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Old Saturday 16th June 2018, 21:20   #4
Binastro
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Hi Merlin,
Can we see a photo of the blemish?

It could be that the coating has lifted somehow and created a bubble.

Bubbles in glass are usually small and I have never heard of one developing.

Is it a foreign substance stuck to the objective?
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Old Sunday 17th June 2018, 07:09   #5
Binastro
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To me, a possible explanation may be that there is stubborn grease on the front surface of the objective.
Baader Optical Wonder fluid might help.
I had this problem with the used Samyang 85mm f/1.4 lens, which otherwise looked as new. At first I made it worse, but the next day the fluid/grease had gone.

Or some oil on the internal rear surface.

A separated objective where the balsam has failed might have happened, but I am not sure this would be visible in normal use.

The coating layer is so thin, if it separated I think it would have to trap oil or water underneath, but I have never seen this.

Photos may help us see a likely cause.

Last edited by Binastro : Sunday 17th June 2018 at 07:13.
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Old Sunday 17th June 2018, 15:01   #6
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They can be repaired as Lee has provided that info, and as they are well traveled a cleaning and tuneup on other parts of the instrument would be beneficial. Subsequently, it will perform well for years.

Andy W.
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Old Sunday 17th June 2018, 15:59   #7
Merlin
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Hi Binastro

Thanks for your response and comments.
I have endeavoured to take a photograph but it reflects the light and shows a reflection of the 'camera/Ipad

It resembles an opaque oil slick.

Thanks for your help

best regards

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Old Sunday 17th June 2018, 16:00   #8
Merlin
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Hi Andy

Thank you for responding, given the use that these have had I think your advice is sound.

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Old Sunday 17th June 2018, 20:52   #9
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lI can understand that this is disturbing, but a blemish on the objective surface would not make the binocular unusable. It would merely reduce the light throughput somewhat. You can focus on objects 3 m or 4 m distant but you can't focus on the objective surface.
Teardrops on ocular surfaces are not uncommon and as these consist largely of common salt, they are not soluble in organic solvents like alcohol or acetone. Try using a moistened cosmetic tissue or miccrofibre cloth and if that fails try saliva on a clean fingertip. The enzymes in saliva can be effective , when all else fails.

John
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Old Monday 18th June 2018, 13:45   #10
Merlin
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Hi John

Thanks for your response

Believe me they are unusable, the blemish creates a blurred and distorted image through that one lens.
I have tried many 'cleaners' including my finger tip without success.

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Old Monday 18th June 2018, 22:19   #11
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I'm curious about one thing. Did this blemish appear overnight, so to speak, or did it start small and steadily become worse?

Bob
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Old Tuesday 19th June 2018, 01:33   #12
John M Robinson
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I bought my Ultravid BRs in 2008 or 9. Back then they came with a lifetime "no fault" Passport warranty. I used it one time when they were brand new to upgrade that old notchy focus problem, but no issues since. I know Leica downgraded their warranty policy since then, but your BA's might have it. I would send them into Leica hoping for a warranty repair, but at worst get a price quote to repair.
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Old Tuesday 19th June 2018, 08:26   #13
Merlin
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Hi Bob
It just appeared overnight.

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Old Tuesday 19th June 2018, 08:27   #14
Merlin
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Hi John

I think I will take your advice, thanks for your comments.

best regards

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Old Tuesday 19th June 2018, 13:12   #15
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Quote:
Originally Posted by Merlin View Post
Hi Bob
It just appeared overnight.

best regards

Merlin
Did you apply cleaning fluid or any other liquid directly to the lens?
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Old Tuesday 19th June 2018, 18:49   #16
Merlin
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Hi Pileatus

I have some lens cleaning fluid in a mini-aerosol which I applied and tried to clean with a Leica lens cloth.

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Old Tuesday 19th June 2018, 18:50   #17
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For it to create a distorted image suggests it is acting as a lens on a lens.

My chemist friend says that if it were salt, ordinary water is required.

Glass is pretty inert, and front elements are usually hard, although inside elements are fairly soft, especially newer exotic glass types.
But coatings are usually harder than the glass, although with age they can deteriorate.
My chemist friend also says that only certain acids affect the front type of glass. Glass beakers take ages to etch in the laboratory, even with acids.

I suppose Leica still has replacement objectives if this is needed, but they may know how to remove the blemish.

It could be, as suggested, be a globule of cleaning fluid or other foreign substance.

P.S.
Merlin,
I think it is the aerosol.

I saw the clever salesman use an aerosol in the camera shop that I visited daily, and where I was the unofficial optics guy.

Big mistake.
A whole lot of stuff came out of the aerosol can and deposit on the camera lens.
It took ages for him to get rid of it.
In short.
Don't use aerosol sprays on optics.

Last edited by Binastro : Tuesday 19th June 2018 at 18:55.
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Old Wednesday 20th June 2018, 11:14   #18
Merlin
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Thanks for that Binastro.

best regards

Merlin
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Old Wednesday 20th June 2018, 11:43   #19
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Quote:
Originally Posted by Binastro View Post
I saw the clever salesman use an aerosol in the camera shop that I visited daily, and where I was the unofficial optics guy.

Big mistake.
A whole lot of stuff came out of the aerosol can and deposit on the camera lens.
It took ages for him to get rid of it.
In short.
Don't use aerosol sprays on optics.
This may or may not have been the cause of your problem, who knows, but is sound advice at all times. Never spray directly onto lens surfaces; always apply to cloth or lens tissue first, before applying to lens!

RB
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Old Thursday 21st June 2018, 11:38   #20
Merlin
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Thanks RB

best regards

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