Shattered scope with compressed air

[Ranger007]

I am just saying for me. I won’t be using canned compressed air anymore. Thank you for posting John.

 

[Brians356]

Do NOT use high-pressure compressed air from cans (such as found in office supply stores). They can, and have, been known to destroy lens coatings.

Very interesting twist, that. They say "destroy" rather than "damage" which suggests a chemical attack rather than mechanical (e.g. stirring up abrasive particles). We know there's more than just air in
"canned air" but I'd have assumed it was inert WRT something like an advanced lens coating.
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[Uncle Mike]

Beating on the windshield from inside to break ice loose doesn't go well, either. Can you guess what model car I was driving?
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Volkswagen Beatle?

 

[Brians356]

Volkswagen Beatle?

Close. VW Beetle (not a "Mop Top").
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[rardoin]

I keep one of these in my range bag; it works very well and I rarely have to clean the lenses directly:

https://www.bhphotovideo.com/c/prod...MIvK_5iYjU8AIVrMiUCR12BAvwEAQYBSABEgJJcvD_BwE

 

[ronsatspokane]

Compressed air cans turned upside down is a common paintless dent removal technique for shrinking metal. It super cools the steel and pop some dents. Not surprised it would pop glass as well. That makes you want to cry.

 

[divingin]

Very interesting twist, that. They say "destroy" rather than "damage" which suggests a chemical attack rather than mechanical (e.g. stirring up abrasive particles). We know there's more than just air in
"canned air" but I'd have assumed it was inert WRT something like an advanced lens coating.
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The stuff I used to use (sold as a "spray freeze"; I'm relatively sure that canned air was the same thing without a pickup tube in the can) was actually a freon variant. I assume you can't sell that stuff in the US anymore.


From Wikipedia:

>>>>>
Common duster gases include hydrocarbons, like butane, propane, and isobutane, and fluorocarbons like 1,1-difluoroethane, 1,1,1-trifluoroethane, or 1,1,1,2-tetrafluoroethane which are used because of their lower flammability.
<<<<<

and

>>>>>

Global warming[edit]​

Difluoroethane (HFC-152a), trifluoroethane (HFC-143a), and completely non-flammable tetrafluoroethane (HFC-134a) are potent greenhouse gases. According to the Intergovernmental Panel on Climate Change (IPCC), the global warming potential (GWP) of HFC-152a, HFC-143a, and HFC-134a are 124, 4470, and 1430, respectively.[7] GWP refers to global warming effect in comparison to CO2 for unit mass. 1 kg of HFC-152a is equivalent to 124 kg of CO2[8]

Ozone layer depletion[edit]​

Gas dusters sold in many countries are ozone safe as they use "zero ODP" (zero ozone depletion potential) gases; tetrafluoroethane, for example, has insignificant ODP. This is a separate issue from the global warming concern.
<<<<<<

 

[Brians356]

GWP refers to global warming effect in comparison to CO2 for unit mass. 1 kg of HFC-152a is equivalent to 124 kg of CO2[8]

Dig deep into what undergirds what appears to be the basic physics of GWP and "greenhouse gases" and you'll find a house of cards founded on entrails of owl. The UN IPCC is a political organization, and any scientific "findings" issuing therefrom are predetermined. Worse, when IPCC says "very likely" the so-called "journalists" translate it "97% agree the outcome is certain".
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[divingin]

Dig deep into what undergirds what appears to be the basic physics of GWP and "greenhouse gases" and you'll find a house of cards founded on entrails of owl. The UN IPCC is a political organization, and any scientific "findings" issuing therefrom are predetermined. Worse, when IPCC says "very likely" the so-called "journalists" translate it "97% agree the outcome is certain".
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Not my point. I was talking about the likelihood of various chemicals eating lens coatings, then and now.

 

[Brians356]

Not my point. I was talking about the likelihood of various chemicals eating lens coatings, then and now.

I did not dispute your point. But you cited IPCC and "GWP" soooo ... clarity is never inappropriate.
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[nakneker]

Shattered a glass pan I just took out of the oven fully of rib roast. It was fall the kids wanted to eat out on the porch, the metal table was cold enough that when the warm glass touched it, it shattered. Same principle I guess. Good video to share, never even thought about something like that.

 

[Brians356]

Shattered a glass pan I just took out of the oven fully of rib roast. It was fall the kids wanted to eat out on the porch, the metal table was cold enough that when the warm glass touched it, it shattered.

What type of glass pan was that? Was it genuine Pyrex® or "other"?
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[nakneker]

What type of glass pan was that? Was it genuine Pyrex® or "other"?
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I honestly don’t remember, it’s been years, it was thick and tinted, couldn’t tell you if it was Pyrex or not though. Probably not knowing how my tightwad brain works.

 

[jepp2]

I keep one of these in my range bag; it works very well and I rarely have to clean the lenses directly:

Same here. Soooo much better than a blow brush which moves almost no air.

 

[Ol Thumper]

Thanks for posting this, I’ll be much more careful cleaning my glass from now on..

 

[Ol Thumper]

You need to get busy on some new videos as well, I enjoy watching those!!

 

[F Class John]

You need to get busy on some new videos as well, I enjoy watching those!!

Thank you. I have a torque wrench video coming that I think will be popular plus I'll be doing a follow up of course to the above video once he gets the scope back.