Re: Inferring that a Camera is a SLR?

• From: David Allsopp <d.allsopp@signal.qinetiq.com>
• Date: Mon, 28 Apr 2003 11:20:24 +0100
• To: www-rdf-interest@w3.org
• Message-ID: <3EAD0068.BF50B505@signal.qinetiq.com>

David Allsopp wrote:
> 
> Yuzhong Qu wrote:
> 
> > > Here is the piece of knowledge that I am trying to use to make the
> > > inference:
> > >
> > >     "Only SLRs have a ThroughTheLens viewFinder"
> > >
> 
> Point of information - as someone has already said, the above statement
> is false in the real world - there are also Twin-Lens Reflexes (which
> you may or may not regard as having a through-"the"-lens viewfinder,
> since there are two identical lenses. Various large-format cameras might
> also be regarded as having such a viewfinder, depending on definition.

> There are also single-lens non-reflexes, e.g. one of the Canon EOS range
> (EOS 600 RT??) which had a fixed half-silvered mirror.

Actually, I withdraw the last sentence; "reflex" just refers to the use
of a mirror -  a moving mirror isn't necessary, e.g. in Twin Lens
reflexes.

Regards,

David.

--

Received on Monday, 28 April 2003 06:17:02 UTC