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Old 07-27-2010, 02:32 AM #1
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Default did I damage the AR coating on my lens?

Last year, someone mentioned that a Q-tip wrapped in Teflon tape works very well in cleaning lenses. I tried it on my Spyder's lens, and it worked like a charm. However, I've recently noticed a few circular markings on the lens that would not come off. I've also tried compressed air, but it didn't seem to work either.

Is it possible that I have damaged the AR coating on the lens?
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Old 07-27-2010, 05:33 AM #2
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Default Re: did I damage the AR coating on my lens?

I'm not an expert, but I was pretty sure the AR coating is on the inside, not the outside. Maybe just try cleaning it again.

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Old 07-27-2010, 06:05 AM #3
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Default Re: did I damage the AR coating on my lens?

Probably not. You might want to use a lens pen, or Eclipse fluid (not very much of it) and a Sensor-Swab. This combination is often used to clean AR coated DSLR sensors that are very, very sensitive.
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Old 07-27-2010, 09:44 AM #4
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Default Re: did I damage the AR coating on my lens?

I'm guessing this is a 405nm laser (don't know the WL product line by name)... If so, there is a chance that the diode itself can be degrading... My 6x bluray diode is degrading and it looks like little dark dots surrounded in wriggly dark rings (hard to explain)..... Can you get a picture of the output of the laser?
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Old 07-27-2010, 11:49 AM #5
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Default Re: did I damage the AR coating on my lens?

Unless the AR coating is just some plastic layer, it's usually applied to the glass via vapor deposition or other methods. This makes it very hard to remove the AR coating short of physical scratching. It's probably as bobhaha suggested and the diode itself is degrading.
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Old 07-27-2010, 03:45 PM #6
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Default Re: did I damage the AR coating on my lens?

No, this is a green laser, not a Blu-Ray one.
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Old 07-30-2010, 07:00 PM #7
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Default Re: did I damage the AR coating on my lens?

I've attached a better picture.

Again, this is a green DPSS laser, not a diode one.
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did I damage the AR coating on my lens?-dirty-lens.png  
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Old 07-30-2010, 07:05 PM #8
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Default Re: did I damage the AR coating on my lens?

I still don't think you damaged it. But you probably need to somehow get the top off to get better access to the lens.

That said, again, see if you can go to a camera shop and get some Eclipse or Eclipse 3 fluid (which is formulated specifically to be 'careful' with AR coatings') and some foam (not cotton) Sensor Swabs, or a "PecPad" lint-free pad to wrap around a normal swab.

Try these, and see if it gets rid of the problem.
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808nm:OLIKE 200mW ∙ JETL PLC 600mW(682pk)
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685nm:18650 47mW
671nm:PGL3M 281mW DPSS ∙ PGL3C 278mW
655nm:LOC 254mW ∙ OLIKE 221mW ∙ Yob 320mW
638nm:Sanyo 40mW ∙ HL63133 200mW ∙ PGL3C 463mWpk ∙ ML520 700mW
633nm:JDS1145 HeNe 28mW ∙ JDS1145 HeNe 26mW
612nm:MG 05LOR151 HeNe 3mW ∙ REO LSTP 3mW
609nm:REO LHOR 1mW
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594nm:Rigel 3mW ∙ LG PGL3C 15mWpk ∙ Lasos 7512 3mW ∙ CNI MGL3 58mWpk
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