Archived posting to the Leica Users Group, 2001/02/27

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Subject: [Leica] Filter measurements with MTF
From: imx <imxputs@knoware.nl>
Date: Tue, 27 Feb 2001 10:14:48 +0100
 
MTF Measurememts on lenses with and without filters show:
a drop in contrast of 1 to 2 % when the filter is of excellent quality. Such
a drop is not visible in practice
 
A drop in contrast around 10%, when the filter is of bad quality. Such a
drop is clearly visible in practice. A drop of 10% is equal to the image
degradation that you get when a lens element is decentred.

Hopefully the filter discussion can be continued on a factual basis now.


Erwin