re:Re: scanner pinhole camera

I'm with George on not liking the images from
pinhole or zone plate bodycaps on digital cameras.
 Many of the images are almost completely
unidentifiable, so it's hard to have a viewer
engage. Digital cameras with APS-size sensors
have diffraction limits with lenses at f-stops
beyond F11 (in the Nikon line). At fstops past
f11, sharpness deteriorates pretty visibly.
Pinholes work differently but at least with the
ones I've tried, the diffraction overwhelms an
image. With many of my experiments I've gotten
lovely colorful mush, with too little detail to
know what the subject is. All the microlenses
over the sensor don't help either, they seem to
have a funky interaction with smaller pinholes.

Then again, I may be spoiled by the crisp edges
and "just right" amount of diffraction that I get
with my ZeroImage 4x5 pinhole.

The post on using a web cam was intriguing since
without the microlenses on digital SLR sensors,
you may get a bit better results, but with a
sensor that small I suspect the results would be
lovable only to a colorfield painter.

Ed

---- Original Message ----

From: George L Smyth <glsmyth@yahoo.com>
To: pinhole-discussion@spitbite.org
Cc:
Subject: Re: [pinhole-discussion] scanner pinhole
camera
Date: Fri, March 30, 2007, 05:26:00

--- peter <peter@peterpinhole.com> wrote:

> I have another digital pinhole idea, that I am
about to try.
> Someone else who has tried this?
>
> I'll start off with a simple flatbed-scanner (a
Canon model) that doesn't
> need any power supply (it runs via USB from the
laptop computer battery).
> I'll take away the cover, and place tha scanner
in a light light box. That
> is, an ordinary, but large, pinhole camera.
> On the scanner area I'll place a home made
"screen", made with
> semi-trasparent paper used for architects
drawings. I guess I need to fix the
> paper onto the scanner with a plexi-glass plate.
> Finally the scanner is connected to the laptop,
and voila - a digital pinhole
> camera!
>
> Ok, one problem that needs to be solved: I guess
I need to remove the lamp in
> the scanner, since I don't want to have any
reflective scanning. All I want
> to capture is the image projected onto the scanner.
>
> And what about scanning time - can that be
handled by the scanner software?
>
> So, any ideas or experiences from similar projects?

Peter -

Interesting idea. I just gave away my old
scanner, though I gave it to my son
so I know that it will find good use. I would
guess that scanning time could
be controlled with the resolution - the higher the
resolution, the slower the
scan.

I put a zone plate in the body cap of my Nikon D70
and that works fine,
although I seldom like the results.

Cheers -

george

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Received on Fri Mar 30 05:16:33 2007