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Article #940

Re: Idek / Iiyama Vision Master Pro - Distortion

#940
From: Tom Robeson
Date: Fri, 07 Mar 1997 00:00
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In <k06cFIAA70HzEwqb@kennedym.demon.co.uk>, Kennedy <kennedym@kennedym.demon.co.uk> writes:
>I recently purchased an Iiyama Vision Master Pro 17E monitor following
>the rave reviews that it has received in the press and recommendations
>from various other sources.
>
>Although initially impressed by the brightness and clarity of the
>Diamondtron screen - probably what gave rise to the recommendations -
>when I started to use the monitor in earnest I was appalled at the image
>distortion. <snip>

>Investigation showed that the distortion depended on the size of
>the circle and the position on the screen.  It was in fact due to a
>horizontal non-linearity present in the monitor! <snip>

>Is this typical of IDEK/Iiyama models?  Do they all have lousy
>distortion?  If anyone has this monitor (or a similar Diamond Trinitron
>screen based unit) can they run the simple test outlined above and let
>me know if their unit is the same, better or worse, and if so what make
>it is.

I am on a quest for an acceptable monitor.  In my quest, I bought a
Sony 200sx.  Like you, I was impressed by the brightness and contrast of the
image.  Later at home, I was amazed at exactly what you found - horizontal
non-linearity.  If I set the pincushion and balance for straight sides, boxes
near the middle of the screen were noticably bowed in.  If I straightened the
sides of these boxes, then the sides bowed out.  HORRIBLE.  I was shocked
to find this gross defect in a Sony.

Since then I have come to the conclusion from hanging out here, that this
horozontal non-linearity is a design compromise just like the visible wires in
all Trinitron type screens.  The Mitubishi tube in your Iiyama Pro is a tube
of this type.

I think Iiyama is a quality company.  I will be driving an hour to look at a
standard Iiyama 17 with a standard Hitachi made tube.  I want straight,
parallel top and bottom edges.  I want extensive adjustments.  I want
acceptable brightness, contrast.

One monitor that fascinates me is the new Panasonic PF17 that uses the
Flat Tension Mask technology pioneered by Zenith resulting in TRULY FLAT,
highly bright and contrasty screens.  Trouble is I'm scared to mailorder a
monitor.  This model must be too new to appear in ads much less any stores
that I can find.

The quest goes on...

Tom
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From: drtom@norfolk.infi.net  (Tom Robeson)
Subject: Re: Idek / Iiyama Vision Master Pro - Distortion
Date: 1997/03/07
Message-ID: <5fo5mh$gen$1@mh002.infi.net>
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References: <k06cFIAA70HzEwqb@kennedym.demon.co.uk>
Organization: InfiNet
Reply-To: drtom@norfolk.infi.net  (Tom Robeson)
Newsgroups: comp.sys.ibm.pc.hardware.video,alt.comp.hardware,biz.comp.hardware