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[OM] Re: focus and ? about lens filters

Subject: [OM] Re: focus and ? about lens filters
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Wed, 09 Jan 2008 07:12:51 -0500
Sorry.  I've lost my notes.  I honestly don't know which is which.

Chuck Norcutt

usher99@xxxxxxx wrote:
> Thanks Chuck,
> Thank Dr. Diffraction for requesting the test and please ask him which 
> is which.  I suppose it is actually immaterial.
> Great test, one of my favorites.
> Mike
> 
> 
> 
> 
> 
> 
> Ah, yes, the giant dust spec test.
> <http://www.chucknorcutt.com/dust%20spec%20test/index.htm>
> Both of these shots were taken with an A1 which has a front element
> approximately the size of a Zuiko 50/1.8.  One shot was taken normally.
>    The other is the same except that there is a piece of black
> electrical tape approximately 3/4" square (19mm) stuck on the front
> element.  Since the front element is about 40mm in diameter the tape 
> was
> blocking about 29% of the glass area.
> 
> The third shot is a comparison of the 1:1 pixel level detail from both
> images.  Can you tell which one is which?
> 
> Yes, I did perform the test but at the request of Dr. Diffraction.  Dr.
> Focus said he didn't expect any impacts in his domain.
> 
> Chuck Norcutt
> 
> 
> usher99@xxxxxxx wrote:
>> Sometimes when hiking in dusty environment will keep a UV filter on 
> and
>> then remove it to shoot.  Little chance of image degradation, though 
> a
>> bit of a pain.  Don't worry too much then about the MC.  Use a good 
> one
>> when want to leave it on.
>> I obsess less about dust on FE after viewing the classic black tape 
> on
>> FE experiment posted by Chuck (or was that Dr. Focus)  Might be time
>> for a rerun.
>> Mike
> 
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