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Originally posted by ArMaP
That depends on the definition of "a few metres", I never thought these things were closer than, for example, 5 metres, because I know they would be completely too much out of focus and invisible.
Originally posted by poet1b
What it does mean is that claims that these must be objects within a few meters of the shuttle simply isn't true.
Originally posted by depthoffield
2) SECOND EXAMPLE:
This is taken from STS-6.
During the mission, astronauts are going outside on an EVA. The sequence is filmed, as astronauts themselves said, with the "AFT TV camera" (maybe someone can give details about it).
Here is the entire sequence narrated by the astronauts:
And here is just the slowed down sequence, showing how iris mechanism of the camera is closing down:
[atsimg]http://files.abovetopsecret.com/images/member/45a6c0ec1c8e.gif[/atsimg]
What we see...astronauts trying to get outside, and camera focused on them, on the background of the image. But there is some part of the shuttle or it's structures, can't say for sure what, and this structure is closer to the camera, partially blocking the view. And because is closer, much closer that the near limit of the depth of field interval of the lens, it appears very unfocused, very blurred. On the same time, there are some edges, or snags of that closer structure, which reflects loccally the light (i didn't think the sun light, but some artifical light from the illumination system of the shuttle, i guess). Those reflexions are punctual. But beeing very out of focus, BOKEH acts here. (and remember those cameras have catadioptric lens, so that's why the dark center of the bokeh)
And as you see, there are BOKEH WITH NOTCHES, produced BY NASA SHUTTLE CAMERAS from CLOSER and OUT OF FOCUS points of light !
Maybe you want to see them better, here is one frame:
[atsimg]http://files.abovetopsecret.com/images/member/ccdcd378e0e9.jpg[/atsimg]
or maybe even better:
[atsimg]http://files.abovetopsecret.com/images/member/6828a81943b2.gif[/atsimg]
More, we see here the cat-eye effect too!
So what we have here?!
A NASA shuttle camera, showing out of focus closer smaller points of light, as BOKEH, with notches and cat-eye effect.
Originally posted by Exuberant1
reply to post by depthoffield
Please stop spamming those images - they are not relevant to the discussion.
You appear to be stuck in a loop. You consistently resort to spamming debunked arguments. You are going in circles.
Originally posted by Exuberant1
Thus far you been unable to produce video with bokeh moving in multiple directions, and at varying speeds.
Originally posted by Exuberant1
*Please go back to the first post wherein you made this argument, and read the posts immediately thereafter.
That 5 metres were a random choice, they could have been 10 or 20. I know that an object closer to the camera will appear out of focus and still highly visible when a camera is focused to infinity, but I don't have any way of know the real limits without knowing the lens' characteristics (and even if I knew I don't know the formulas to calculate those limits, but those are "searchable").
Originally posted by depthoffield
But, Armap, you put a 5 meter limit and assume those out of focus closer particles should be "too much out of focus and invisible". Why that?
My opinion in this case cannot be trusted because I know that the distance is from one side of the cargo bay of the shuttle to the other, so even if I try to ignore it my mind will always be influenced by that.
What distance you feel that is from camera to the astronaut, and from camera to the out-of-focus notched-bokeh reflexions in this case?
Originally posted by poet1b
reply to post by depthoffield
The video in this link provided by Easynow proves you wrong.
www.youtube.com...
This video clearly shows that tiny close up objects in the camera's aperture disappear when the camera zooms out and focuses on distant object, and this is clearly shown in this video.
The presence of particulates in the Space Station environment could cause a variety of deleterious effects. Their settling on sensitive optical surfaces will cause decreased performance by physically obscuring or scattering emission from bright off-axis sources. Particulates above surfaces in the field-of-view of sensitive instruments will efficiently scatter and emit thermally. These near field sources could dominate remote emission levels. Sunlit particulates appear brighter than stars, entire cities, and even lightning strokes.
Originally posted by depthoffield
Then, here, remember my experiment, it is a small particle (1 mm), lit by the sun, placed only 1 meter away from the camera:
This object here is a head of a pin, 1 milimeter or smaller in size, and the lens is focused about 6 meters away or more (could be very well focused to infinity, like here in the second experiment:
clearly, you can see it's produced BOKEH.
So , a 1 mm particle (BRIGHTLY LIT - this is important! and this is the situation with debris in space) close 1 meter to the camera, even when zoomed on infinity, can produce a bokeh disc.