Archived posting to the Leica Users Group, 2000/11/17

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Subject: Re: [Leica] UV filter for Noctilux-measurable light loss??
From: John Collier <>
Date: Fri, 17 Nov 2000 07:07:34 -0700 ain't so Joe!

I am taking advantage of the fact that I live in the near far North and will
not be seeing the sun for a few hours yet. I set my trusty Minolta Auto
Meter IVF to ISO 400 (reflective with dome off) and went looking for a dark
hole to crawl into. The big problem was finding a place I could meter and
see the display as well. Finally I found a tone that gave me 1 second at
f1.0 and 0/10ths (the meter reads to tenths of a stop). I then held up an
old B+W 39E 010 1x filter (UV not MC)in front of the measuring cell and hit


John Collier

> From: Nicholas Poole <>
>> It never occurred to me that it would but come to mention it in very low
>> light
>> levels I could see how i COULD have an effect.
>> On a bright day if the UV filter takes out 1 unit of light out of a few
>> hundred
>> units the effect is negligible.
>> In a coal mine at midnight with one candle off in another part of the cave
>> you
>> have only 5 units of light to work with.
>> You don't want to loose one.
>> Could that be true? Seems like it would be.
>> mark rabiner
>> :)
> Apologies, Mark!
> I had not read your post, only the snip in Tina's. My comments related to
> the coal mine bit and did you a disservice. You're absolutely right of
> course, since the *proportion* cut by the filter is vastly different in
> these two situations. Sorry.
> Nick