Well, I guess if none of you guys can see the
point, that might explain why Canon can't,
either.
Malcolm asked: What's wrong with Canon's EF 70-200 f4L?
Answer: it's 200mm, as opposed to 400mm. Stick
a 2x on it and it becomes a 400 f8, as opposed
to the 400 f5.6 that I have. And sure, 200 x
1.6 is 320, but then 400 x 1.6 is 640. It's
still a full frame lens, so wastes half the
light. I realise that the optical difficulty is
at the short end, but the weight is at the long
end! There is some gain, of course, because the
optical quality in the centre is always going to
be better. Anyhow, no rumours, it seems, so if
Canon don't want to compete, might have to start
looking elsewhere. I guess they figure that
anyone who wants a nice telephoto should buy a
5D to attach it to. Seems like a relatively
short term strategy to me: there's nothing that
magical about 24x36 frame size and a sensor that
big is always going to be more expensive as are
the lenses to cover it. They will also
presumably always be a bit less noisy, but given
how good noise reduction software is now, not
much of an issue. Given a system costing, say,
£5K and one costing £10K and weighing twice as
much, I reckon most would suffer a tad more
noise. There will always be a few lugging view
cameras up mountains! No rush, my 10D still
does very nicely.
Peter
I believe I explained why there's no point and no
advantage to designing telephoto lenses for
smaller senor cameras.
No size advantage. No weight advantage. No cost
advantage. Just a smaller market.
The 'wasting half the light' argument doesn't
fly. All long lenses could cover larger areas,
but are baffled to avoid too much extraneous
light bouncing around. For the smaller sensor
sizes tighter baffels could be installed, but the
EF lenses are already well baffled, so that isn't
going to gain you much.
--
* Henning J. Wulff
/|\ Wulff Photography & Design
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