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[OM] Re: focus and ? about lens filters

Subject: [OM] Re: focus and ? about lens filters
From: usher99@xxxxxxx
Date: Tue, 08 Jan 2008 22:59:29 -0500
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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