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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