UV Alert??

[garethhhhh]

Just curious if anyone can tell me what the "UV Alert" enclosed with my UV Filters means...

I bought a Hoya UV filter today and inside it says:
! (UVA:320nm - 380nm)
!! (UVB:280nm - 320nm)

Will using UV Filters harm my eyes? :?

Sorry if this is a stupid question... :roll:

[vvizard]

nm I'm most definetly sure means "nanometer", and nanometers is the way to specify light-color if I'm not mistaken. So theese filters then probably filter out different light-color. Could somebody else verify this, or prove this false, as I'm not 100% sure..

[EXA1a]

Just curious if anyone can tell me what the "UV Alert" enclosed with my UV Filters means...

I bought a Hoya UV filter today and inside it says:
! (UVA:320nm - 380nm)
!! (UVB:280nm - 320nm)

Will using UV Filters harm my eyes? :?

Sorry if this is a stupid question... :roll:
The lower end of the visible light scale is violet (400nm wavelength). Below comes UVA or near UV, and further below comes high-energetic UVB light. The latter is the more dangerous species because it damages DNA and causes skin cancer. UVA is less harmful but can also induce skin cancer.
BTW: Filter cannot harm your eyes, they only filter out certain light out of the given spectrum. UV filters filter out the UV portion of any light source.

--Jens--

[karusel]

Eyeglasses of any kind have a UV or better said anti-UV layer to prevent UV rays from entering an eye. Filters for lens have essentialy the same UV layer for essentially the same function, so this filter will even protect your eyes when looking through OVF.

[Scottes]

But what does it really mean? ? ?

Should I be alerted about something? Is this just listing what this filter filters?

I was kinda curious about that when I got my Hoya. It's kinda of a silly sticker it seems. I'd certainly think it was strange if the sticker said: "Warning! 2 + 2 = 4!" But this Hoya Alert doesn't say anything much different....

[vvizard]

But what does it really mean? ? ?

Should I be alerted about something? Is this just listing what this filter filters?

I was kinda curious about that when I got my Hoya. It's kinda of a silly sticker it seems. I'd certainly think it was strange if the sticker said: "Warning! 2 + 2 = 4!" But this Hoya Alert doesn't say anything much different....

They filter two different ranges of UV-light I think, easy as that. And that's probably information usefull to many, as the amount of UV-light and it's wavelength vary with height-above-sea unless I'm mistaken.

[garethhhhh]

Jeez! If they're going to write UV Alert! inside the little box then they should explain themselves a little... otherwise your "Average Joe" (me) wont have a clue what they're talking about :?: :roll:

[Scottes]

otherwise your "Average Joe" (me) wont have a clue what they're talking about

I still have no idea if I should be worried or not.... "Alert" in big letters.... I feel like I should be looking for my gas mask....
:shock:

[karusel]

What? I don't get it. What the heck are you panicking about? The lens or filter or anything does not produce any sort of rays. UV filter for lens is to prevent from hay effect that is typically in UV spectrum. UV light A or B, not sure which, also makes your skin brown, however extensive amounts of UV cause cancer. Again, UV filter filters UV rays OUT. So printing a warning note seems highly illogical to me.

[iwatkins]

No idea why these have started appearing in Hoya hard cases recently.

I thought it was interesting to have the little alert card in the case for my R72 IR filter ;)

Cheers

Ian

[Rob Larsen]

A very timely post. I just got a CPL and UV filter today and was pondering the same silly message. The way it is written makes no sense. I did a Google search of the entire Hoya web site and found no references there. Something got lost in the translation on that card....

[ron chappel]

Yeah,it's easy to understand WHAT they are talking about but WHY is a different matter...
As Rob says,something may be lost in the translation?

still,the tech info could be usefull all the same