Pentax claims that the 645D is going forward.
On May 11, 2009, at 6:57 PM, JC OConnell wrote:
MF is dead forever. There would be FF digital before they ever
went back to those huge bodies and lenses of 67 or 645 size.
JC O'Connell (mailto:[email protected])
"Honesty is the first chapter in the book of wisdom" - Thomas
Jefferson
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf
Of
Graydon
Sent: Monday, May 11, 2009 5:18 PM
To: Pentax-Discuss Mail List
Subject: Re: DA* 60-250 at B&H
On Mon, May 11, 2009 at 02:07:07PM -0700, Joseph McAllister scripsit:
From information absorbed by my little noggin way back when, I am now
under the impression that "optimized for aps-c" meant, among other
things, that it was an effort to make the light rays more parallel as
they struck the sensor to prevent the color fringing we see in our
digital images. Supposedly caused by the angle of incidence of light
rays to the sensor pixels in the corners and periphery of said
sensor,
which allowed the light ray to strike more than one pixel under such
circumstances.
Remember that the sensor isn't sitting out there in the air; it's
got a
cover, the cover has thickness, and reflects and refracts. The rear
lens element reflects, too. Film is an absorptive medium -- the
photon
hits and sticks -- so the optical behaviour of the digital sensor
stack
is considerably different.
"more vertical" incident light may help with getting consistent
behaviour from the sensor stack; there's certainly no obvious reason
that you couldn't design a full frame lens that way. It'd have to be
the whole lens, though.
This may be part of Pentax's decision not to go with full-frame
digital;
they'd have to redo the whole lens lineup to get performance they
considered acceptable.
-- Graydon, who really does think it's going to be APS-C, MF, and
nought
else from Pentax
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