Leitz glass transforms uv in to visible light

[zeitz]

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When a photon strikes any atom, in glass or not, if the photon has sufficient energy (E = Planck's constant x frequency) to cause an electron to jump to a higher energy state (E greater than the W Work function), the electron will emit a photon of another frequency when it transitions back to a lower energy state.  See this Wiki article.

https://en.wikipedia.org/wiki/Atomic_electron_transition#:~:text=In atomic physics and chemistry,an atom or artificial atom.

I don't know which atoms in glass, if any, are subject to this effect due to UV light.  One could speculate that the W Work function of radioactive glass elements may be lower than other glass elements.  The OP lists lead and fluorite in glass as candidates.

[pgk]

4 hours ago, Mustafa Umut Sarac said:

Have you ever heard something like optical design ? 

Yes, and it operates under the laws of physics. I'm not at all sure what you are trying to explain, but UV only causes a visible glow when it collides with material which fluoresces in the visible spectrum (it can cause UV fluorescence but that's not visible so be definition can't be a visible glow). And even if the glass in a lens did emit visible fluorescence when excited by UV and did actually glow, this would not be imaged onto either film or sensor but would cause an effect not unlike veiling flare and would simply reduce contrast. If you post an example of what you are talking about it would help.

[pippy]

3 hours ago, 250swb said:

Have you? Your entire premise is based on the uncoated Summitar having radioactive glass as part of its optical design, but it doesn’t.

+1.

P.

[frame-it]

8 hours ago, jaapv said:

Possibly and the Summarit let it through ( no Absorban) 

and there is a wide "range" of UV

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this is pure UV with barely any contamination>>

 

[frame-it]

7 hours ago, Mustafa Umut Sarac said:

We are talking about different thing , when the uv hit to the radioactive , lanthanide , leaded glass or fluoro glass , I repeat when the uv hit these glasses , it makes a visible glow.

this is correct, but that glow is hazy it doesn't enhance or give more detail to the image

[frame-it]

9 hours ago, jaapv said:

Possibly and the Summarit let it through ( no Absorban) 

Monochrom as well > https://www.ultravioletphotography.com/content/index.php?/topic/3011-who-would-have-guessed-that-this-leica-gear-could-record-uv-not-me/#comment-24113

and https://www.ultravioletphotography.com/content/index.php?/topic/3721-uv-film-setting-experience/

 

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Edited November 22, 2023 by frame-it