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Re: [OM] Polarizing filter tests

Subject: Re: [OM] Polarizing filter tests
From: "C.H.Ling" <ch_photo@xxxxxxxxxxxxx>
Date: Wed, 15 Jul 2009 09:25:39 +0800
Yeah! Just like Olympus said 0.4 deg sensor tilt is within their factory 
specification of E-3.

C.H.Ling

----- Original Message ----- 
From: "Chuck Norcutt"

> What's most disturbing to me is that I expect that the QC on "L" lenses
> is probably very good meaning that the identified "duds" are actually
> within spec.  The Z 21s probably are too.
>
> Chuck Norcutt
>
>
> usher99@xxxxxxx wrote:
>> 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

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