It's about telecentricity. To quote from the four-thirds.org website
write-up on the design philosophy (nb the second para):
==========================================================================
The image sensor in a digital camera can be compared to a "deep well." You
cannot see the bottom
of the well unless you lean over it. In the same way, light inclined at an
angle cannot reach the image
sensor (i.e. the bottom of the well). Many of the current
interchangeable-lens D-SLR cameras using
traditional 35 mm film camera lenses are very susceptible to loss of
sharpness, chromatic aberration,
and shading of peripheral areas. Wide-angle type lenses are especially
problematic since oblique light
inclined at a large angle tends to enter the peripheral areas.
With the Four Thirds system, the diameter of the lens mount exceeds the
sensor size and the digital-
dedicated lens design allows all the light (even on the periphery) to travel
perpendicularly to the
surface of the image sensor. The result is a sharp, clear image reproduction
throughout the image plane.
Linear propagation of light and the high imaging performance made possible
by the digital-dedicated
design are the biggest features of the Four Thirds lenses.
==========================================================================
Piers
-----Original Message-----
From: olympus
[mailto:olympus-bounces+piers.hemy=gmail.com@xxxxxxxxxxxxxxxxx] On Behalf Of
DZDub
Sent: 23 May 2014 16:01
To: Olympus Camera Discussion
Subject: Re: [OM] Spare 43 body cap?
On Fri, May 23, 2014 at 6:04 AM, Chuck Norcutt <
chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
> don't know why the 4/3 mount would be as large as the OM mount.
>
>
Grudging sort of homage to Maitani? They kept the option open of making the
E-system backwards compatible to the last moment?
I think we were startled that the E-1 was quite as large as it was, as a
whole, but not that the pie hole was that size. Some of the original claims
for 4/3 were never realized until m43. To get to something like the E-M5,
we had to go through the E-system and the new Pens. Seems almost Darwinian
in hindsight.
Joel W.
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