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Location: UFOUpDatesList.Com > 2007 > Dec > Dec 10

Re: Skylab 3

From: Michael Tarbell <mtarbell.nul>
Date: Sun, 09 Dec 2007 12:22:53 -0700
Archived: Mon, 10 Dec 2007 08:46:14 -0500
Subject: Re: Skylab 3


>From: Martin Shough <parcellular.nul>
>To: <ufoupdates.nul>
>Date: Sat, 8 Dec 2007 14:57:39 -0000
>Subject: Re: Skylab 3

>>From: Bruce Maccabee <brumac.nul>
>>To: <ufoupdates.nul>
>>Date: Fri, 7 Dec 2007 12:12:58 -0500
>>Subject: Re: Skylab 3

>>However, to have image extension that is "left-right" as well as
>>"up down" one needs more than just one axis of motion. In this
>>case one needs two axis motion and that requires accelerations
>>to change the rotation from around one axis to around another,
>>perpendicular axis, and that results in "loopiness" of the
>>photo. I should point out that in "loopy" motion one often gets
>>bright spots which signify (if the light itself is constant)
>>momentary slow-downs or stops in the angular rotation (bright
>>spots imply longer exposures at various portions of the "loopy"
>>image."

>Just a thought: Is it possible that the characteristic looping
>returns of the light trail in normal camera jitter are partly
>due to gravity? In free fall there is no restoring force, so
>excursions of the camera off-axis will perhaps not be self-
>correcting in quite the same way. Could this lead to more linear
>and less loopy-looking trails?


Gentlemen,

It may not be appropriate to consider gravity a "restoring"
force in this context, as it suggests that gravity tends to
return the camera axis to the desired alignment. This would only
hold in the case of a camera that is pointed straight down.

Aside from that nit, I find plausible the idea that the
'trajectory' of the camera aimpoint would differ in a free-fall
environment, perhaps even to become more linear, as Martin
suggests.

If such was the case, it would not eliminate the 'bright spot'
issue that Bruce alludes to, and indeed would exacerbate it. A
human being would not be capable of hand-reversing the linear
course of the camera at constant angular rate, and indeed this
would be difficult even with mechanical assistance. It seems
unavoidable that the linear segments in the image would have
tell-tale brightened end points. But this is just what is seen
in the fourth photo!

So, it may be prudent to ask, what is the minimum time required
for a human hand to execute three out-and-back linear 'jitters'
of some tenths of a degree in angular width? And, is the
corresponding shutter speed consistent with any plausible
configuration of the camera at the time (lens size, f-stop, film
speed, etc.)?


Mike



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