The end of the DSLR

On 5 Aug 2008 23:19:01 -0500, "Toby" wrote:

It will take a long time for EVFs to equal OVFs.

LOL that's what they said about digital photography over film
photography. EVFs and LCDs will indeed improve and will replace
pentaprisms likely sooner than you think, the new DSLRs today already
include live preview.

Ron

*****Boreal Photography*****
http://borealphotography.com

**Digital Photography Blog**
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Scott W wrote in
:

On Aug 7, 3:41*am, Chris Malcolm wrote:
David J Taylor
.
uk wrote:

You can call it what you want, but the image needs inversion
before it
is
suitable for most of us to view.....

But we must be careful to distinguish between the rotational and
lateral inversions. For example, why do mirrors interchange left
and right but not up and down?

They don't chnage left and right, what they do change is front to
back, which is what changes the handedness (if that is a word).

So x and y axis stay the same but z becomes -z.

I am late to this party but what the hell...

Scott's three lines are an admirably concise account of what plane
mirrors do. I, on the other hand, intend to run on for a bit.

Concave mirrors producing a real image invert along all 3 Cartesian
axes, as do lenses creating real images. Optical systems which create
odd numbers of inversions create net inversion. Systems which create
even numbers of inversions create images which are equivalent to a
rotation plus a possible change of scale.

This is of profound significance in the busines of life.

Molecules which cannot be rotated into congruence with their mirror
images created by a plane mirror are called dissymetric. Thus, almost
all amino acids involved in protein molecules are dissymetric.
Humans can metabolize amino acids with one stereochemistry at the
carbon closest to the acid carbon, but not their mirror image
structures. Other such selectivity occurs all through nature.

One of the very earliest insights into this phenomenon came from a
young lady called Alice, she of the looking glass and Wonderland. She
says, at one point, "Perhaps looking glass milk is not good for you."
This is a remarkable piece of thinking for the 19th century,
particularly since both books were written, I think, before van't Hoff
and le Bel published their separate papers on the stereochemistry of
carbon. (Neither of them was the originator of the idea but their work
came along at a time when the world was ready for it.)

- Shankar

On Tue, 23 Dec 2008 01:51:39 GMT, Shankar Bhattacharyya wrote and
wrote and wrote:

Scott's three lines are an admirably concise account of what plane
mirrors do. I, on the other hand, intend to run on for a bit.

Sometimes failing to be succinct is a virtue, as here. Thanks!