did anyone try this: cheap point-n-shoot on the back of a large format beast?

"chibitul" wrote in message
...
In article ,
(Sabineellen) wrote:

Just wondering if I can "piggy-back" a
cheap point-n-shoot on the back of a large format beast?


why? what for?

do you have any idea what a large format camera can do??? you can move
the lens and the focal plane independently, achieving effects never
possible with a point-n-shoot (or even a dSLR).

You can get bellows lenses for Nikons, I believe, and tilt and shift lenses
for Canon, that achieve much of what the bellows on a large format camera
does. Can't use them on a P&S, of course, but you can use them on DSLR
bodies. No AF, but at that point, who'd expect that?

--
Skip Middleton
http://www.shadowcatcherimagery.com

chibitul wrote:

In article Q2YPc.18274$Oi.4714@fed1read04,
"Mark M" wrote:



How will the "image act as an object" without the glass?

just to clarify, the image is there regardless if you have the glass or
not. The rays will keep propagating toward the digicam, and they
"emerge" from the real image, no glass needed. as I said, optics.

lol
--

Stacey

"chibitul" wrote in message
...
In article Q2YPc.18274$Oi.4714@fed1read04,
"Mark M" wrote:



How will the "image act as an object" without the glass?

just to clarify, the image is there regardless if you have the glass or
not. The rays will keep propagating toward the digicam, and they
"emerge" from the real image, no glass needed. as I said, optics.

Are you saying that you just stick the digicam in there...focus on the point
where the glass WOULD HAVE BEEN...and voila...you'll get the full image????

That doesn't work.

"chibitul" wrote in message
...
In article Q2YPc.18274$Oi.4714@fed1read04,
"Mark M" wrote:



How will the "image act as an object" without the glass?

just to clarify, the image is there regardless if you have the glass or
not. The rays will keep propagating toward the digicam, and they
"emerge" from the real image, no glass needed. as I said, optics.

Are you saying that you just stick the digicam in there...focus on the point
where the glass WOULD HAVE BEEN...and voila...you'll get the full image????

That doesn't work.

"chibitul" wrote in message
...
In article Q2YPc.18274$Oi.4714@fed1read04,
"Mark M" wrote:



How will the "image act as an object" without the glass?

just to clarify, the image is there regardless if you have the glass or
not. The rays will keep propagating toward the digicam, and they
"emerge" from the real image, no glass needed. as I said, optics.

Are you saying that you just stick the digicam in there...focus on the point
where the glass WOULD HAVE BEEN...and voila...you'll get the full image????

That doesn't work.

"chibitul" wrote in message
...
In article Q2YPc.18274$Oi.4714@fed1read04,
"Mark M" wrote:



How will the "image act as an object" without the glass?

just to clarify, the image is there regardless if you have the glass or
not. The rays will keep propagating toward the digicam, and they
"emerge" from the real image, no glass needed. as I said, optics.

Cameras collect lens-projected light, but they can't reach out and bend
projected light at some imaginary plane and change it's direction so that it
is bent toward a tiny sensor which is too small to collect the light as it
is projected by the lens. Draw a picture to see why this doesn't work.

The light must be bent toward the tiny confines of the sensor, or you'll get
nothing but a tiny piece of the image...which would basically appear big
blurry light.

"chibitul" wrote in message
...
In article Q2YPc.18274$Oi.4714@fed1read04,
"Mark M" wrote:



How will the "image act as an object" without the glass?

just to clarify, the image is there regardless if you have the glass or
not. The rays will keep propagating toward the digicam, and they
"emerge" from the real image, no glass needed. as I said, optics.

Cameras collect lens-projected light, but they can't reach out and bend
projected light at some imaginary plane and change it's direction so that it
is bent toward a tiny sensor which is too small to collect the light as it
is projected by the lens. Draw a picture to see why this doesn't work.

The light must be bent toward the tiny confines of the sensor, or you'll get
nothing but a tiny piece of the image...which would basically appear big
blurry light.

In article
,
chibitul wrote:

just to clarify, the image is there regardless if you have the glass or
not. The rays will keep propagating toward the digicam, and they
"emerge" from the real image, no glass needed. as I said, optics.

The problem at this point is that the light rays from the big camera's
lens are radiating outward in a cone, focused on the glass screen (or
film). The P&S can only ever see a tiny fraction of that cone where-ever
you put it, except perhaps very close in behind the camera lens where
its tiny lens can intercept the complete cone. Unfortunately the image
would be wildly out of focus there, plus it would negate all the
features of the large format camera you are hoping to utilise.

Try it out for yourself by making a simulated LF camera with a simple
magnifying glass set in a hole in a cardboard box, with a sheet of lunch
wrap on the opposite side representing the glass screen. Depending on
the focal length of the magnifier and the size of the box, you should be
able to see a focused image on the screen. Now remove the screen and
place your eye (the P&S equivalent) in the cone of light. There's no
position where your eye can see a coherent image, the physics of light
simply don't allow it.

Focusing the P&S on the ground glass screen would work, but it would be
a grotty photo. The screen is only intended to give the photographer an
idea of the composition, but it it full of zillions of tiny defects that
aren't a problem normally.

------
~IRO
My ambition in Life is to build something that will
REALLY last....at least until I've finished building it.

In article
,
chibitul wrote:

just to clarify, the image is there regardless if you have the glass or
not. The rays will keep propagating toward the digicam, and they
"emerge" from the real image, no glass needed. as I said, optics.

The problem at this point is that the light rays from the big camera's
lens are radiating outward in a cone, focused on the glass screen (or
film). The P&S can only ever see a tiny fraction of that cone where-ever
you put it, except perhaps very close in behind the camera lens where
its tiny lens can intercept the complete cone. Unfortunately the image
would be wildly out of focus there, plus it would negate all the
features of the large format camera you are hoping to utilise.

Try it out for yourself by making a simulated LF camera with a simple
magnifying glass set in a hole in a cardboard box, with a sheet of lunch
wrap on the opposite side representing the glass screen. Depending on
the focal length of the magnifier and the size of the box, you should be
able to see a focused image on the screen. Now remove the screen and
place your eye (the P&S equivalent) in the cone of light. There's no
position where your eye can see a coherent image, the physics of light
simply don't allow it.

Focusing the P&S on the ground glass screen would work, but it would be
a grotty photo. The screen is only intended to give the photographer an
idea of the composition, but it it full of zillions of tiny defects that
aren't a problem normally.

------
~IRO
My ambition in Life is to build something that will
REALLY last....at least until I've finished building it.

"chibitul" wrote in message
...

yes, that is what I mean. Most cameras have a macro mode, but you can
also put the camera about 0.5 meters away from the ground glass.

Ok, the image is dim, but [...]

It's just plain crazy to think of photograhing the ground glass. Has the OP
ever looked at a ground glass? And that's only one reason.