Peter Stevens wrote:
Good morning, David. Dern, man, you're one thoroughly deductive gentleman...
and cheerfully optimistic, I might add, to think that some of us will be able
to "tuck something away in our minds" until 2023. Heck, I could I put it up
the front... way up front... in 72 count bold Helvetica font, and it'll be
gone by next week... if I'm lucky.
All joking aside, thanks for working through the problem out-loud for us. The
depth of knowledge, talent, and humor around here is really fun and
enlightening. :)
I liked your "original" eclipse image with the purple ring better than the
"corrected" one, by the way. Thanks.
From: David Young <dsy@xxxxxxxxxxxxx>------
To: LRflex <leicareflex@xxxxxxxxxxxxx>
Sent: Wednesday, August 30, 2017, 1:37:14 AM EDT
Subject: [LRflex] An odd problem...
After totality, at the eclipse, I noticed an odd problem in my photos... a
double image.
http://www.furnfeather.ca/eclipse/double.html
I quickly realized it was the same problem as with some photos I took with
the DMR/R8 combination that had a blue tint in the middle of the image.
It is a problem that does not occur with film, because film has a matte
surface.
But sensor's are shiny, with glass on top, to be even more shiny.
One of the main challenges, in the digital age, for lens/camera makers, was
to make the coatings on lenses less reflective. You see, in limited cases
with older lenses designed for film, the light would reflect off the sensor,
back to the rear element of the lens, and then back to the sensor - ad
nauseum. The result was a blue patch (in the case of my Leitz 80-200/4
Vario) and the result can clearly be seen as a blue patch in the middle of
tis shot of my old Beauty Six camera, shown here:
http://www.furnfeather.ca/eclipse/BeautySix.html
It's worse with a glass solar filter, as the inside is a perfect mirror.
I realized that when I'd put the filter on my Telyt, for the first half of
the eclipse, it was a wee bit crooked. As it made no difference, I'd not
bothered to correct it and thus disturb my alignment, but when I put the
filter back on, after totality, I got it "right" - squarely on the lens.
That's when the problem occurred.
The simple cure was to once again, put the filter at an angle. Like so:
http://www.furnfeather.ca/eclipse/cure.html
Problem solved!
It's a little late for this eclipse, but if you're planning on the 2023 or
2024 eclipses (we are!), it's something you may want tuck away, in the back
of your mind, for future reference.
David.
--
David Young - Photographer
Logan Lake,BC, CANADA
Website: www.furnfeather.ca
Gallery: The Creative Co. Merritt, BC.
E-book: http://tinyurl.com/ABHoP
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