Archived posting to the Leica Users Group, 2000/05/18

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Subject: RE: [Leica] Noctilux viewfinder blocking
From: "Takeshi Hashimoto" <>
Date: Thu, 18 May 2000 09:47:11 -1100

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On Thu, 18 May 2000 16:00:21   Peterson Arthur G NSSC wrote:
>I don't know, and so can only presume John is right, that the "M rangefinder
>is more accurate than a SLR at 50mm."  But my question is this: given the
>fact that with an SLR one is actually looking through the lens at (almost
>always) full aperture, does it not then stand to reason that an SLR would be
>able to focus any lens, of whatever focal length and whatever maximum
>aperture, with sufficient accuracy for that particular lens?  I'm not being
>argumentative, just asking what seems like a reasonable question.

But the accuracy of the M system is fixed by the width of the two viewfinder ports. As the lens gets faster/longer, it (the margin of error) becomes too great to focus within the DOF of the lens. In other words, with an f/1.0 lens, the SLR is probably a little better.

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