Date: 9/8/20 9:05 am From: Lew & Marti Ligocki <ligockibirds...> Subject: [obol] Re: Another optics related question
Orange air in Salem also. Zero birds have appeared when we’d usually have 10 species by now. Not enough ambient light to read by in our east-facing kitchen.
From: Alan Contreras
Sent: Tuesday, September 8, 2020 8:53 AM
Subject: [obol] Re: Another optics related question
3. Repeat as needed.
Steady micro-ashfall in orange-air Eugene. No significant change in who is doing what at the feeders.
On Sep 8, 2020, at 8:47 AM, larspernorgren <larspernorgren...> wrote:
Just what is a "microcloth"? Should I make an effort to use them over t-shirts, toilet paper, paper towels? In high school our physics teacher explained how the coatings on lenses worked, and how easily these delicate layers could be damaged by careless wiping. Everytime l get a new set of prescription glasses they come with a case and cleaning cloth. Every time l lose those glasses l keep the case and cloth. I have also acquired small pieces of textile targeted for lens care at symposia, complete with the event's logo.
The various cloths in my possession are highly variable. Some are hard and smooth and make me think they might scratch the coating directly, or fail to absorb dust particles and blemish the coating by a sort of secondary action. Some of these cloths are very thick, pleasing to my fingertips. I fantasize such absorb the dust and lovingly cleanse the sullied lense. Even the best of textiles must eventually get clogged. Can they be cleaned, and how?
Is it advisable to store clean cloths in a ziploc bag or other tightly sealed device? I always keep eye glasses in the glove box, and accompanying cloths in the glasses' case I got at time of purchase. Typically, after a drive from Fields to Roaring Springs my glove box has dust in it. So does the inside of most of the eyeglass cases. Isn't it probably worse to use a "micrcloth" drenched in road dust than an immaculate, disposable paper tissue? Will vigorous shaking render the dusty cloth safe? How about using drinking water for a field cleaning?