Re: Flourescent Lenses

[al <nissar@xxxxxxx>]

Could it be you have lenses that have flourite elements in them. Canon has
some i believe.




At 07:14 PM 9/25/98 -0400, you wrote:
>I noticed, about a year ago, that about half my lenses
>flourese in UV light.
>There seemed to be no correlation with lens age or quality.
>It crossed my mind that lens flourscence, not film sensitivity
>to UV, could be the main reason to use a UV filter.
>
>Any ideas?
>
>Dave Horn
>
>
>>Date: Sun, 20 Sep 1998 22:05:24 -0500
>>From: filje@xxxxxxxx (p j geller)
>>Subject: uv&ir filters
>
>>While using a black light bulb to
>>look at some other things, I noticed that 
>>a deep yellow glass filter was 
>>fluorescing. I decided to check some other
>>pieces of glass and found among the other
>>things that glowed under uv were a B+W 092
>>and hoya R(25a) , Y(k2), 
>>but my older vivitar filters in ther
>>same colors don't fluoresce
>>except for  , a k2 med. yellow and fld.
>
>>Another disturbing discovery was the
>>first or second piece of glass shining brightly
>>greenish-yellow in a  Canon 200 f2.8.
>>as well as several other lenses.
>
>
>>Would an IR image be sharper if there were
>>a UV filter placed before an IR filtering lens?  
>
>
>
>>phillip geller
>>phillip geller photography
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