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front lense is stained, from the inside

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/10/2009 at 10:00
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My second hand bushnell banner has finally arrived but the front lense is stained with an oily substance,  is there any way I can remove the front lense for cleaning?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/10/2009 at 10:22
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Optics Apprentice
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Quote My second hand bushnell banner has finally arrived but the front lense is stained with an oily substance, 
 
That may very well be some kind of lubricant which found its way inside your riflescope.
 
Worst case scenario: fungal infestation
 
Quote is there any way I can remove the front lense for cleaning?
 
Not without considerable mechanical skills. On top of that, the nitrogen filling (IF there's any left) which prevents fogging, will be gone when you open the scope.  
 
It's only a Banner. Roll Eyes
 
Throw it away and buy a better scope! Wink
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/10/2009 at 12:06
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haha ya I really should throw it out but its good enough for a .22, i guess i'll leave it alone
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: February/10/2009 at 12:11
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Here's the deal.
1) You can send it to Bushnell and then they can fix it, and you will pay whatever it will cost, they may even upgrade you at a discounted cost.
 
2) You can try to repair it yourself. It's really not that difficult to do. The nitrogen can be repurged by going and filling an airtank at a truckstop that uses nitrogen for tire inflation. There are several that do use nitrogen. Remove the screw for the purging port and compress the air 5 times. Each time let the air out, the fifth time you will have 99.9% nitrogen in the scope. Note that getting the lens back into the perfect focus is a pain and takes patience. This has to be done before the purging. Also the type of cleaner you use is critical. It must be coating safe.
 
I would call Bushnell and inquire first. If nothing else then you can attempt this and possibly save from throwing it away.
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