Archived posting to the Leica Users Group, 1996/08/08

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To: (Leica Newsgroup)
Subject: Re: M6 Meter Calibration...
From: Wolfgang Sachse <>
Date: Thu, 8 Aug 1996 09:04:43 -0400 (EDT)

> Godfrey DiGiorgi <> wrote ...
<snip> ...

> It sounds to me that the M6 and Pentax are calibrated a stop down ...
<snip> ...

> "C.M. Fortunko" <> wrote ...

> Subject: Re: PX625 Alkaline Battery Tests: Observations and Questions
<snip> ...

> I wrote the original message. I do not want people to draw conclusions like
> that yet....

	Hi Group -

	I fail to see the importance of Chris' exhaustive tests
	of all his camera equipment.

	As far as I can tell, my M6 is right on. Any errors in
	exposure have been mine and mine alone.

	I note, however, that for some EV-values, I can adjust
	the exposure within a 1/2 stop with no perceptible
	difference in two LED's intensities - so I don't
	understand the usefulness of this comparative testing
	with the M6-meter. I think that you're trying to use
	the M6 meter for something it was really NOT designed
	for. It's just an indicator display and an approximate
	one at that.

> I don't understand the reasons for the differences. They may have been
> affected by the focal lengths used and the internal construction of the
> different meters.

	Maybe. But please remember. All these things you're
	testing are consumer products and to keep them affordable,
	they're designed to a different standard than scientific
	or military products. None of the cameras or light meters
	you're testing bear the label `Calibration traceable to
	NBS' or conforming to a particular `DIN Standard'.

	-- Wolfgang

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