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Location: UFOUpDatesList.Com > 2004 > Feb > Feb 26

Re: Whittlesea-Beveridge Photo - Golubic

From: Victor Golubic <Peetkin.nul>
Date: Wed, 25 Feb 2004 15:59:00 EST
Fwd Date: Thu, 26 Feb 2004 14:12:34 -0500
Subject: Re: Whittlesea-Beveridge Photo - Golubic

>From: Brad Sparks <RB47x.nul>
>To: UFO UpDates - Toronto <ufoupdates.nul>
>Date: Wed, 25 Feb 2004 02:45:38 EST
>Subject: Whittlesea-Beveridge Photo

>I don't see how any serious analysis of the Whittlesea-Beveridge
>photo can possibly be done without knowing the Field of View
>(FOV), in degrees, of the picture that was taken. Yet despite
>all the various postings on this case, including Kodak DC240
>digital camera data, not one single person has posted the FOV in
>Degrees or even raised the question of its absence from analyses
>until now. Without the FOV in Degrees you cannot tell how high
>in degrees the "UFO" was in the sky or what direction various
>objects in the photo were really at. How can you analyze the
>photo without that kind of data?

>I contacted Kodak for information on the FOV for the DC240 but
>the camera is no longer produced and they did not have the data.
>At best they guessed from various file data that the Wide Angle
>lens would give about a 85.5 degrees wide FOV, but that was a
>guess based on interpreting various parameters and possibly
>interpreted them wrong, by a low-level customer service
>representative. My own rough estimate of the FOV from
>measurements of objects of approximately known size is roughly
>100 degrees.

>All of the argument earlier on this list about conflicting
>direction of sun shadows was due to the fact that in a wide
>angle view the objects that look like they are almost in front
>of you are actually way off to one side in a significantly
>different direction. Thus the control box to the left side of
>the photo looks like the sun is coming down on the front and
>sides yet the railroad crossing signs directly in front of the
>camera look like the sun is behind them. Both are right. Why?
>Because straight ahead is W (West) but the control box off to
>the left is about in the SW (South West), a considerably
>different direction.

>What is needed is the FOV measured directly from the camera used
>and an interview with the photographer so there is no
>uncertainty about what lens was used and at what setting.

>Brad Sparks

Interested parties:

Given the statement that the camera operates optically from,
what I assume is 1.0X through 3.0X optically with a zoom
equivalent focal length on a 35 millimeter camera of 39-117 mm,
the actual focal length as stated, is instead, 6 to 18 mm for
the DC240.

Therefore, with the given information, one can assume that the
CCD measures approximately 6 millimeters diagonally (assumed,
but could be purely horizontal), with an aspect ratio (width to
height) of 2.6/3.4 (as measured from various pages both
featuring and stating these width to height values).

With that given, at normal mode (non wide angle settings)
the FOV "diagonally" is probably very close to:

1X magnification - 2 * Arctan((6/2)/6) = 53.1 Degrees.
...therefore, horizontally the FOV is 44.0 Degrees
...and vertically the FOV is 33.7 Degrees

3X magnification - 2 * Arctan((6/2)/18) = 18.9 Degrees.
...therefore, horizontally the FOV is 15.7 Degrees
...and vertically the FOV is 12.0 Degrees

And, assuming the lens behaves linearly,
2X magnification - 2 * Arctan((6/2)/12) = 28.1 Degrees
...therefore, horizontally the FOV is 24.7 Degrees
...and vertically the FOV is 17.8 Degrees

One may then interpolate any increments between these values
depending upon the zoom setting at the time and place the image
was recorded.

For wide angle settings, I've sent questions to various testing
resource outfits and await a response.  Other than that, testing
the camera and interviewing the witness, as Brad has stated, is
the only logical course of action.

Victor Golubic

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