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[OM] Polarizing filter tests

Subject: [OM] Polarizing filter tests
From: usher99@xxxxxxx
Date: Tue, 14 Jul 2009 18:17:05 -0400
Ha!  You are quite right they won't send  a random sample of 5.  I 
always worry that the QC/sample variability  is an elephant standing in 
the room.  Way TOO many reports of dud Canyon 24-105 f4IS "L lenses and 
even a cursory  look into the Canyon 300 f4IS "L" results in one 
concluding that  many dogs leave the factory.
Of course a vocal tiny burned minority can make much noise these days.

   Mike Hatem of course found some significant wider aperture 
performance variability in the Z. 21 f2's, but none were dogs per se. I 
suspect high quality pol's might be difficult to manufacture and some 
measure of the index of dispersion in performance for a given  brand 
would be very useful.
We'll probably never see it.  I'd bet the incidence  a undeserved red 
dot being applied is very small.

Mike




Well, see, there's a niche you can fill!  Since all the filters were
loaned I'd bet the manufacturer's would be loathe to lend 5 at once so
their QC could be evaluated!

Chuck Norcutt

usher99@xxxxxxx wrote:
> Quite interesting,
> Thanks for the link.  Nice methodology but wished they tested five of
> each type to help assess
> manufacturing consistency.
> Mike
>


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