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[OM] Why Olympus won't produce a digital body

Subject: [OM] Why Olympus won't produce a digital body
From: drchrisbarrett <drchrisbarrett@xxxxxxxxxxxxxxxxxxxx>
Date: Sat, 24 Mar 2001 05:30:06 +0000
C.H.Ling wrote:

"The further the light beam deviated from the center the larger the
angle,
Olympus also mentioned the normal lens design mainly affect the light
fall
to the edges of the CCD not center. If your CCD is 640x480 the size may
be
even only 1/3", the angle will be too small to cause problem."

Yes, I agree with you. But this is only a small part of my argument.

My points are:

The structure of the CCD shouldn't have a problem with the range of
angles from a 35mm format lens.

Olympus' argument about 35mm format wide angle lenses just doesn't stand
up.

"I'm not sure about your statement "small rear element a long way from
CCD"
is need to reduce the angle is true or not, I just know Olympus claim
they
design the E-10's lens with light perpendicular to the CCD. They have a
rear
element larger than the CCD NOT smaller, sorry!"

Exactlty !

So their argument about 35mm format wide angle lenses is not correct.

My numbers n my orginal post were calculated on the assumption that
there will be rays from edge of the rear element travelling right to the
diametrically opposite corner of a CCD, i.e. the worst possible case.
And the angles I calculate still are'nt shallow enough to cause a
problem.

And if the rear element of their E-10 is larger compared with the CCD,
then their CCD is receiving rays of light at angles at least as shallow
as from a 35mm format lens.

If the rays from the E-10 are perpendicular, then they are not using the
whole diameter of the rear element. So why put in a larger diameter rear
element than necessary? If the glass is there then it is generating rays
from the whole of its area.

Digital cameras that I've seen, both video and still, look to me to be
using short lens to film plane distances and lens element diameters
which give similar geometry (and worse) than 35mm format lenses would
give.

"A CCD of 1/2" with 2M pixel like the Olympus
C2000 will have much smaller CCD pixel size, it will have much more
problem
than a large pixel CDD element, that's the relative surface area vs deep
of
the pixel that count, I hope you understand what I mean."

Yes, I do. But the structure of a CCD is very shallow. It is not microns
deep.

See my posting to Tom. I just don't think we've yet seen what digital
can really do.

Chris


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