Igor, what about this?
"Despite the prevailing notion of extraterrestrial ships as round flying
saucers, there have been reports of octagonal UFOs. Apparently, even
aliens find the octagon an appealing shape".
Alan C
On 15-Apr-22 08:15 PM, Igor PDML-StR wrote:
I thought some people here might find this curious:
It is interesting to see 5[!] images of the aperture.
Pentax D FA 100 mm F2.8 Macro (not "WR") @ f/5.6
(The lens has 9 elements in 8 groups.)
Some other images from this setting showed only 4.
Never mind the central part of the photo - this is one of the images
to be deleted. I did not crop it out just to show the context of how
the image was taken:
http://42graphy.org/misc/ApertureImages/ApertureImage_IR09244.jpg
I cannot say that I _fully_ understand how all these images are
formed, - especially after looking at this photo:
http://42graphy.org/misc/ApertureImages/ApertureImage_IR09238.jpg
This has up to 8-9 aperture spots, but some of them are motion-blured.
The camera was hand-held, with the motion reduction enabled.
I am guessing that the motion-blur comes from the camera shake, not
compensated by the sensor. But it also makes me wondering if all these
aperture images are effectively just the same single image - due to a
reflection from the sensor that moves as the sensor compensates for
the camera shake.
Any thoughts?
Cheers,
Igor
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