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

Re: Skylab 3

From: Bruce Maccabee <brumac.nul>
Date: Sun, 9 Dec 2007 17:10:06 -0500
Archived: Mon, 10 Dec 2007 08:48:52 -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"

>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?

Not likely. First, there is a restoring force: the hand.

The photographer tries to steady the image by applying a force
(torque) opposite to the direction of motion (rotation). This is
quite independent of gravity unless the lens on the camera is
large enough to have a noticeable torque that tends to pull the
lens downward (main body of camera held by hands, of course).
Removing this downward force on the lens (no gravity) would not
remove the hand vibration and the continual attempts to

Also, if the shutter time was 1/250 of 1/500 sec there likely
wouldn't be time for hand vibration to switch from up-down to
left-right. If there were noticeable smear it would be a short
unidorection smear resulting in changing a perfectly round dot
to one elongated ina single direction.

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