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What is Happening to My Lens?

Started Jun 20, 2018 | Discussions thread
saxyomega90125
saxyomega90125 Junior Member • Posts: 40
Re: What is Happening to My Lens?

AiryDiscus wrote:

The cleaning techniques I have been taught, in three relatively reputable sources ((1), B.S. in optics, lab coursework, (2), JPL optics certification, (3), time at optics manufactures, e.g. Optimax) is that it really doesn't matter. The overwhelming majority of coatings are safe for cleaning with acetone. It is only some fussy protective coatings that are not safe, and first-surface aluminum mirrors which are not a concern in consumer camera lenses.

Well, now that I look like an idiot.... My lab experience is mainly in biology.

Thanks for the info about coatings. If it is that unusual, I'm wondering why so much of the crap in my old college lab had coatings that were susceptible to it - I have seen lab-grade acetone damage lenses there a few times. Are there any coatings used in medicine and the like that are problematic? Besides the lens cement in the microscopes. A bit off-topic but I am intrigued.

The gloves are a salient point. Chem labs have butyl around but I've seldom seen them anywhere else. In bio labs we use latex and change every hour or so when working with acetone to be safe. The usual medical-grade nitrile gloves last 10-30 minutes.

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Canon EOS 80D Canon EF 300mm f/4.0L IS USM Sigma 30mm F1.4 DC HSM Art Zeiss Milvus 100mm F2 Tamron 10-24mm F3.5-4.5 (B023)
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