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Follow-up info on general optics (lens and mirror) cleaning practices used in our electro-optics / IR fabrication and assembly factories. Avoid cleaning if possible. Avoid cotton on anti-reflection coated optics. Talc free gloves. Blow off contaminants with dry filtered compressed air or...
I think Glassaholic probably nailed it. Especially not cleaning if you don't really need to, rub and sleek/scratch avoidance, never ever use ammonia based products and some other solvents that will break down refractive coatings, etc. I haven't been onsite for awhile but our local factories...
I happened to be in Wuhan on a river cruise vacation about 10 years ago. It struck me at the time that nearly half a billion people are fairly densely packed along the Yangtze River. If this outbreak gets away from them there, the toll could eventually be gruesome.
Re: WARNING ~ TR ~ My experience How come there isn't a dedicated forum section just for "all-star" threads like this one? I'm always worried I might miss out on one of these intriguing funfests... Just a suggestion.
Re: What to fill lead shot bags with If weight is truly no object, Dupont Zircon M sand is the heaviest. Sinclair Int'l sells it. Twice has dense and normal sand. Chromite sand is nearly has heavy and cheaper.