Re: Window reversal

[P3D Gregory J. Wageman <gjw@xxxxxxxxxx>]

George Themelis replied:

>Somehow communication has become a bit difficult lately...

Why, George?  Just because we're not all simply agreeing with you?

I wrote:

>>With all due respect to the good Doctor, I don't think that's what Bill
>>was describing at all.  To me it sounded more like the situation that
>>results when you photograph a subject which is closer than the 7-foot
>>window with a Realist. 

>That's "window violation" assuming that this object intercepts
>the edges of the window.

Unfortunately I didn't express this as clearly as I might have.  I was
assuming a the entire *scene* intercepts the window.  In this case, 
less sees more left and right sees more right.  With a slide, this
"stuff" must be masked out to get a proper window.  However this is
completely a product of the BUILT_IN window of a Realist-format camera,
and has little to do with print mounting.

You elided the most relevent part of what I said, namely:

>>In print mounting, I think this would come about if your closest object
>>spacing was reduced to less than that of the mount's window centers.  The
>>view would still converge (in fact would be easier to freeview) but the
>>window's edges would not also be converged.

If you're using a twinned rig, remember the window's at infinity.
So in my mind, it makes no sense to call it "window violation" (the
whole scene, every picture, is a "window violation".  It's a mounting
(actually, cropping) error.

	-Greg W.


------------------------------