Archived posting to the Leica Users Group, 2002/05/10

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Subject: RE: [Leica] Noctlilux and filters
From: "B. D. Colen" <>
Date: Fri, 10 May 2002 16:04:12 -0400

But isn't the bottom line that you use the meter the way you always do - you
just have to think a bit differently as you decide what and where you want
middle gray...? ;-)

So the real answer to the question is - when you use a filter on a camera
with a built-in meter you don't have to screw around with filter factors.

B. D.

- -----Original Message-----
[]On Behalf Of John
Sent: Friday, May 10, 2002 3:47 PM
Subject: Re: [Leica] Noctlilux and filters

The answer is yes and no.

If you use a filter to alter the tone of a small part of your image,
then the meter should average the whole scene and the tone will shift as
desired. If, however, the tone you want to alter occupies a large part
of your image then the meter will suggest an exposure that will render
the tone as middle grey regardless of what filter you put on.

For example if you have the sky as a large portion of your image, your
meter will suggest a reading that will give you a middle grey sky. If
you want to darken the sky in relation to other tones, you could put on
a deep (red, yellow, green or orange) filter which will reduce the
amount of the sky's blue light that reaches your film. If you then meter
the sky with the filter in place, then you will still get a middle grey
sky and the other tones will be overexposed. So if you meter on the sky
with the filter in place you need to reduce the exposure to make the sky
darker (maybe two stops? It depends on the B+W film you are using). You
also can meter without the filter and apply the filter factor manually.
That way the sky will be darker and the other tones will not be
overexposed. As always, you have to think about what you want the image
to look like and meter accordingly. The hard part is not the metering;
that is easy, the hard part is imagining the image...

John Collier

PS: Yes I have left out the more complicated bits on the colour
sensitivity of the meter and the film.

On Friday, May 10, 2002, at 11:07 AM, wrote:

> Question:  Will the TTL metering system automatically adjust with the
> filter
> on, or does one need to make the calc and then manually make the
> adjustment?
> Dante

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