On 20 Aug 2003 at 13:25, Tapani Tarvainen wrote:
> On Wed, Aug 20, 2003 at 12:08:02PM +0200, Marco Kost
> ([EMAIL PROTECTED]) wrote:
>
> > There will also be a new lens called EF-S 18-55, which is the
> > equivalent to 29-88mm for film. It will be only available in
> > combination with an EOS 300D.
>
> Moreover it will apparently only work with the 300D, not with any
> older EOS body! A rather radical move from Canon's part.
Not sure if any of the sites mentions it, but according to Robert
Scott's newsletter, the cause is the shorter back-focus (distance
between rear lens and film), which is easy to compromise if you use a
smaller mirror, which can be done only because of the smaller chip-
size.
(but which probably has *not* been done before on the other/older
less-than-full-size-chip digicams!)
And it is this mirror that prevents a classic/symmetric lens design
normally, and using a telefocus design instead....the
classic/symmetric design is easier, even though it suffers more from
the cos^4 light-fall off.
--
Bye,
Willem-Jan Markerink
The desire to understand
is sometimes far less intelligent than
the inability to understand
<[EMAIL PROTECTED]>
[note: 'a-one' & 'en-el'!]
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