jys schrieb am 23.01.19 um 04:29
On Mon, Jan 21, 2019, at 01:28, Stéphane Gourichon wrote:
A cheap and easy way to get an a good dark region in a scene is to take an
archive cardboard box with one hole. I can't find a reference now so I write
here my own analysis of why it works so well.
There's some discussion about that here:
http://www.imatest.com/docs/veilingglare/#target
Remco Viëtor schrieb am 21.01.19 um 12:57:
I'd suspect either stray light, or light reflecting/scattering around inside
the objective and camera body. The image projected by the lens is a circle, of
which you use the center part. But the cut-off edges are still bringing light
into the camera/lens system, and even mat black reflects some light.
Hi Stéphane, Remco, jys,
thanks for your input about black holes and stray light. I'll digg into
that as soon as I've some spare time again and report my results thereafter.
--
regards
Bernhard
https://www.bilddateien.de
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