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Path: utzoo!watmath!watnot!watcgl!dmmartindale
From: dmmartindale@watcgl.UUCP (Dave Martindale)
Newsgroups: net.video
Subject: Re: camera evaluation
Message-ID: <1769@watcgl.UUCP>
Date: Wed, 8-May-85 22:52:08 EDT
Article-I.D.: watcgl.1769
Posted: Wed May  8 22:52:08 1985
Date-Received: Thu, 9-May-85 03:39:21 EDT
References: <917@druid.UUCP>
Reply-To: dmmartindale@watcgl.UUCP (Dave Martindale)
Organization: U of Waterloo, Ontario
Lines: 36

In article <917@druid.UUCP> adv@druid.UUCP (DeVossA) writes:
>
>I demo'ed a Panasonic WV3240-12X industrial quality camera
>lines of resolution:350
>signal/noise(video luminance):46db
>The camera I was comparing it with (and own) is a sony CCD-G5:
>lines of resolution:250
>luminance:46db
>
>The discovery I made was that with the luminance the same,
>the lines of resolution made little impact on the picture quality.
>In fact the Sony had a lower background noise level and had richer colors.
>The lighting, recorder(Magnavox portable) and tape type(TDK-EHG)
>were identical.
>
>Am I missing something obvious or does the difference of 100 lines
>of resolution make little difference in picture quality?
>Looking at industrial/pro camera specs the figures that
>creep up are the luminance ratings as well as lines of resolution.
>
>Portable VHS and Beta Hi-Fi's have an average luminance
>of around 40db. RCA boasts 45db.

It looks like you have just demonstrated that both cameras are as good
or better than your recorder, and you know nothing about relative
differences between the cameras.  The specs seem to bear this out:
the recorder's S/N is worse than either camera, and I believe most
existing 1/2 inch VCR's have a video bandwidth that gives about 250 lines
of resolution.  Superbeta might reveal a difference between the cameras
since its bandwidth is greater.  Provided, of course, that your monitor
has the bandwidth to display the difference.

Just for contrast, the 3-tube portable cameras you see being used
at sporting events and fires and conventions have resolutions at the
centre of the image in the 600-line range.  NTSC is capable of much
better images than you usually see.