Does anyone use this on their eyeglasses, lenses, and ground glass, especially with condensation due to dark cloth use with large format cameras? How often do you use it? Other comments?
Anti-Fog Spray for Ground Glass, Lenses and Eyeglasses
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I have only used it for glasses. I would not use it for optical equipment, especially since there are other ways to get the optics to the ambient temperature.
When under the dark cloth it really pays to stop breathing in those conditiions. I've often wodered if a scuba snorkel would help avoid fogging but we don't get those kind of conditions enough to have tried.
I live in Canada, in winter a modified snorkel is part of my kit. Works great.
Does it look like a steam powered camera?
hell no! Nothing touches my lenses.
Well, now that I think about it, when I use the "olde thyme camera" as my son calls it, I do get a lot of weird looks.
Maybe I was steam punk without knowing it. All I need is a top hat with goggles.
I just keep envisioning little puffs of breath coming out of the snorkel into the cold Canadian air.
What is wrong with putting anti-fog on the smooth glass side of the groundglass focusing screen? It's NOT in the optical path to the film! It's not even in the optical path from the lens to the focusing surface.
Anyone can see that antifog treatment of eyeglasses does not degrade your vision thru the eyeglasses, nor your vision thru a windshield treated with antifog.
So if you cannot see effect of its application in a window, and it is not in any critical optical path, can it ever matter?
Anyone can see that antifog treatment of eyeglasses does not degrade your vision thru the eyeglasses, nor your vision thru a windshield treated with antifog.
So if you cannot see effect of its application in a window, and it is not in any critical optical path, can it ever matter?
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It leaves a residue that could later be hard to clean off and cause other problems.
Residue, not in the optical path between lens and film/focusing surface...what is the issue (especially if it is not visible even on the surface of your eyeglasses?!) Plus, I have never seen a residue on my windshield or eyeglasses or ski googles or diving mask or bathroom mirror.
Hi Wiltw. I believe there are two kinds of anti-fog for eyeglasses: one that is basically detergent and another that is mild acid. Not sure if product specs divulge this or not since I’ve never looked. NASA uses anti-fog on spacecraft windows, etc.
spinoff.nasa.gov
On a GG… can’t imagine a problem. Heck, even saliva would work.
Anti-Fog Compound | NASA Spinoff
On a GG… can’t imagine a problem. Heck, even saliva would work.
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The problem would be build up on crud on the glass. I have found the residue has to be washed off glasses, so I stopped using it.
Been using one anti-fog liquid on windshields for years, no residue.
Been using a different anti-fog on bathroom mirrors for years, no residue.
Been using a different anti-fog stick on ski goggles for years, no residue.
Been using a new antifog spray on glasses and diving mask for past year, no residue.
Worthwhile to know what you use, which caused residue, so we all can avoid it.
I threw it out a long time ago.
I just looked up Material Safety Data Sheets (MSDS) on antifog products, and went thru about a 15 descriptions. Predominant contents seen in this sample pf products. are one or more of the following...
- Water
- one or another form of alcohol
- docusate sodium
- glycol derivative
- surfactant
Admittedly, there are some industrial antifog agents which appear to be quite toxic, but such toxicity would not be permissable in any products that might harm a layman in routine usagel.
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I admire your research! That’s what I’d expect to see, although I’d have to look up “docusate sodium” to find out what that is. 
EDIT: I just did… it’s a LAXITIVE”. Oh my…
And then there is this:
phys.org
EDIT: I just did… it’s a LAXITIVE”. Oh my…
And then there is this:
High levels of PFAS found in anti-fogging sprays and cloths
The anti-fogging sprays and cloths many people use to prevent condensation on their eyeglasses when wearing a mask or face shield may contain high levels of per- and polyfluorinated alkyl substances (PFAS), a new Duke University-led study finds.
I admire your research! That’s what I’d expect to see, although I’d have to look up “docusate sodium” to find out what that is.
EDIT: I just did… it’s a LAXITIVE”. Oh my…
And then there is this:
High levels of PFAS found in anti-fogging sprays and cloths
The anti-fogging sprays and cloths many people use to prevent condensation on their eyeglasses when wearing a mask or face shield may contain high levels of per- and polyfluorinated alkyl substances (PFAS), a new Duke University-led study finds.
Per- and Polyfluorinated Substances (PFAS) Factsheet | National Biomonitoring Program | CDC
CDC’s Division of Laboratory Sciences coordinates the National Biomonitoring Program (NBP) which offers an assessment of nutritional status and the exposure of the U.S. population to environmental chemicals and toxic substances.
www.cdc.gov
"The per-and polyfluoroalkyl substances (PFAS) are a group of chemicals used to make fluoropolymer coatings and products that resist heat, oil, stains, grease, and water. Fluoropolymer coatings can be in a variety of products. These include clothing, furniture, adhesives, food packaging, heat-resistant non-stick cooking surfaces, and the insulation of electrical wire."
Again, sounds to be industrially used agents, not ones that you or I would apply as consumers as optical antifog; maybe in waterproofing of cloth (I checked...not in 3M waterproofing)OTOH the article you quoted apparently has unearthed some unknown issues
"The researchers tested four top-rated anti-fogging sprays and five top-rated anti-fogging cloths sold on Amazon. They found all nine products contained fluorotelomer alcohols (FTOHs) and fluorotelomer ethoxylates (FTEOs), two types of PFAS that largely have flown under the scientific radar until now."
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Could you look up this one I;m using and provide the link to the data sheet or copy it here?Tks.
ZEISS Anti-Fog Defender Lens Cleaning Kit
BH #ZEAFDK • MFR #000000-2451-373
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Something that might be happening in your car. Many people leave their system to recirculate the air to heat faster. That causes fogging because you're recirculating the water vapor in the occupant's breaths. Then they start trying to wipe off the fog and never can keep up. It;s dangerous.
Either switch to fresh air by shutting off recirculation. Or turn on the AC at the same time you're heating. You can keep the setpoint high. Just let the AC run at the same time. That will raise the dew point and also help from fogging.
I just happened to look up the Zeiss product before reading your request! Their GUILTY products contain the fluorine-base antifogging, and FL can be very very caustic (e.g. hydrofluoric acid)
FLUOROSURFACTANT Fluorosurfactant
PERFLUOROALKYLETHER Perfluoroalkylether
FLUORO WETTING AGENT
Although… FL probably at a very low level. I can’t find it now, of course, but in the past saw some patents or products using either citric or boric acid in the 5 or 7 hundredths of a percent range.
Still… I’d rather use spit.
BTW… not intending to put you on-the-spot with a trick question but you seem more chemistry-oriented than me… what is the purpose of a laxative in an anti-fog formula???
Still… I’d rather use spit.
BTW… not intending to put you on-the-spot with a trick question but you seem more chemistry-oriented than me… what is the purpose of a laxative in an anti-fog formula???
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OK I made a decision. I'll just stay home when it's cold and drink hot chocolates.
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Could you look this up. I use this stuff on everything. My eyeglasses, lenses, filters, monitor.
ZEISS Cleaning Fluid (2 oz, 2-Pack)
BH #ZELCSQ • MFR #2390368If that’s the same as they use to saturate the lens wipes… mostly water and some alcohol and a bit of detergent. Good stuff; much better than non-name brand lens wipes.
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