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Location: UFOUpDatesList.Com > 2004 > Feb > Feb 27

Re: Subject: Re: Whittlesea-Beveridge Photo -

From: Tom DeMary <t.demary.nul>
Date: Fri, 27 Feb 2004 00:30:23 -0600
Fwd Date: Fri, 27 Feb 2004 16:29:41 -0500
Subject: Re: Subject: Re: Whittlesea-Beveridge Photo -

>From: Victor Golubic <Peetkin.nul>
>To: UFO UpDates - Toronto <ufoupdates.nul>
>Date: Wed, 25 Feb 2004 15:59:00 EST
>Subject: Re: Whittlesea-Beveridge Photo - Golubic


>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).



Your math is sound, and a 6 mm diagonal is a reasonable
assumption, but you are in effect assuming the FOV, since it is
determined by sensor size and focal length of the lens. The
sensor size could be from 4 to 9mm, which makes a big difference
in the angle of the Field of View, if the focal length was 10mm,
as given in the EXIF data.

>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.

The camera, as far as I can tell, has no wide angle setting - it
has a zoom lens (39 - 117mm as stated above). 39mm is not very
wide. The camera does have an optional accessory lens, which
fits over its zoom, to give a wide angle 35mm equivalent of
24mm, as Brad Sparks mentioned in material I snipped out.

I thought that the 35mm equivalency was straight-forward, until
I saw this is a link that explains three different ways that
camera makers can specify it:


These proliferating low-end digital cameras are all about ease
and convenience, with very little useful documentation
about their photographic specifics.

Tom DeMary

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