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: Tina Manley <images@InfoAve.Net>
Date: Fri, 17 Nov 2000 13:29:11 -0500
References: <5.0.0.25.2.20001117111623.01e513e0@127.0.0.1>

At 10:50 AM 11/17/00 -0700, you wrote:
>Tina,
>
>Are you using the meter as a reflected meter or an incident meter? If you
>are using it as an incident meter, you may be shading the dome slightly with
>the filter rim and your hand. I just repeated your experiment with the same
>meter in reflective mode, ISO 3200 and the speed set at 125th (f stop was
>1.4 and 4/10ths). The UV filter reduces light by 1/10 of a stop. I tried two
>different types of B+W UV filter, one single coated and one multicoated and
>got the same results both times.

The dome is off. I'm using it as a reflective meter.  I still say 1/10 of a 
stop is enough to make a difference in the dark.


>Now none of this is to encourage you to use UV filters! I do not use them
>(except in salt spray or in sandy wind). Nor is this intended as
>instruction!! I do would never give you, Ted, Jim, Mike and others
>advice!!!!!!!!!!! I only continue to subscribe so I can get the pearls of
>photographic wisdom that you Olympian Photographers pass on to us mere


I learn a lot here, too, John; but I'm not about to start using 
filters!  Even one photo lost to reflections or flare is too many.

Tina

Tina Manley, ASMP
http://www.tinamanley.com

In reply to: Message from Tina Manley <images@InfoAve.Net> (Re: [Leica] UV filter for Noctilux-measurable light loss??)