Older scope with lens haze

[thunderflash]

So, have an older scope with a rear lens haze that will not clear up with ordinary cleaning .Any other nutz have this problem , & can suggest a DIY fix?

 

[Can-down]

You need to clean the inside, you should be able to find some youtube vids of people taking apart optics for cleaning.

Otherwise, Trace Optics could probably clean it for you?

Depending on brand it might be covered.

 

[dan belisle]

You need to clean the inside, you should be able to find some youtube vids of people taking apart optics for cleaning.

Otherwise, Trace Optics could probably clean it for you?

Depending on brand it might be covered.

Second Trace for this. - dan

 

[Potashminer]

I have had not much luck with taking optics apart and then getting them sealed up when going back together again - I do have an older Weaver scope - that rear lens closest to your eye is NOT a single layer - is actually two layers with some sort of tree sap or glue between - has an air bubble in there that will move as you tilt or change orientation of the rifle. So, no doubt that "fluid" can also change over the years - is not a slam dunk certainty that the "haze" is a coating of crap on inside of the lens.

If it is crap on inside of that lens, one would think some amount of it might be on all the other lens surfaces in there?

 

[DGY]

Phil at trace is your man!! Really really great service!!

 

[AP]

I have had not much luck with taking optics apart and then getting them sealed up when going back together again - I do have an older Weaver scope - that rear lens closest to your eye is NOT a single layer - is actually two layers with some sort of tree sap or glue between - has an air bubble in there that will move as you tilt or change orientation of the rifle. So, no doubt that "fluid" can also change over the years - is not a slam dunk certainty that the "haze" is a coating of crap on inside of the lens.

If it is crap on inside of that lens, one would think some amount of it might be on all the other lens surfaces in there?

when two lenses are cemented as a group they are referred to as a ‘doublet’ this is a common optical construction; older doublets often used Canada Balsam to cement them together. The problem is that Canada Balsam can release due to thermal or physical shock - usually this takes on the appearance of a brown haze when this occurs. The discolouration may or may not cover the entire lens. Canada Balsam dries like any other cement; there are techniques to cause it to release … but requires special skill. Newer cements are cured with UV but I am not sure if they can be caused to release.

Other sources of haze can be from fungus or residue from outgassing of lubricants or other material used in the construction. It can also be the result of internal fogging due to moisture that dries leaving a residue.

 

[thunderflash]

when two lenses are cemented as a group they are referred to as a ‘doublet’ this is a common optical construction; older doublets often used Canada Balsam to cement them together. The problem is that Canada Balsam can release due to thermal or physical shock - usually this takes on the appearance of a brown haze when this occurs. The discolouration may or may not cover the entire lens. Canada Balsam dries like any other cement; there are techniques to cause it to release … but requires special skill. Newer cements are cured with UV but I am not sure if they can be caused to release.

Other sources of haze can be from fungus or residue from outgassing of lubricants or other material used in the construction. It can also be the result of internal fogging due to moisture that dries leaving a residue.

Seems that this might be the issue with the interior as the rear lens after cleaning ,will not come clear. Thanks guys for your replies!-- Will give Trace a call.