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#1
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did anyone try this: cheap point-n-shoot on the back of a large format beast?
Did anyone try to use a large format camera to get an image (with all
the advantages of large format cameras: tilt, shift, etc) and then use a small digicam instead of film to snap the picture? I imagine if you make some sort of fixture to attach the digicam to the back of the large format camera, and focus on the glass plate, you should be able to snap *that* image. I never used a large format camera and I do not intend to venture into this field unless I can do it digitally. I am not into high resolution stuff, I read some of Ansel Adams books and I am impressed with what you can do with large format when you can tilt/shift the lens and the negative as you want. Just wondering if I can "piggy-back" a cheap point-n-shoot on the back of a large format beast? |
#2
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did anyone try this: cheap point-n-shoot on the back of a largeformat beast?
chibitul wrote:
Did anyone try to use a large format camera to get an image (with all the advantages of large format cameras: tilt, shift, etc) and then use a small digicam instead of film to snap the picture? I imagine if you make some sort of fixture to attach the digicam to the back of the large format camera, and focus on the glass plate, you should be able to snap *that* image. I never used a large format camera and I do not intend to venture into this field unless I can do it digitally. I am not into high resolution stuff, I read some of Ansel Adams books and I am impressed with what you can do with large format when you can tilt/shift the lens and the negative as you want. Just wondering if I can "piggy-back" a cheap point-n-shoot on the back of a large format beast? If you mean to use the point and shoot camera to photograph the image on the ground glass, it won't work. The image is much too dim to record with such a camera. Also, you couldn't focus close enough unless the camera had a macro mode, which most likely it wouldn't. |
#3
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did anyone try this: cheap point-n-shoot on the back of a large format beast?
In article ,
Leonard Evens wrote: chibitul wrote: Did anyone try to use a large format camera to get an image (with all the advantages of large format cameras: tilt, shift, etc) and then use a small digicam instead of film to snap the picture? I imagine if you make some sort of fixture to attach the digicam to the back of the large format camera, and focus on the glass plate, you should be able to snap *that* image. I never used a large format camera and I do not intend to venture into this field unless I can do it digitally. I am not into high resolution stuff, I read some of Ansel Adams books and I am impressed with what you can do with large format when you can tilt/shift the lens and the negative as you want. Just wondering if I can "piggy-back" a cheap point-n-shoot on the back of a large format beast? If you mean to use the point and shoot camera to photograph the image on the ground glass, it won't work. The image is much too dim to record with such a camera. Also, you couldn't focus close enough unless the camera had a macro mode, which most likely it wouldn't. 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 this is large format camera here, not sports or action. we're talking landscapes, biuldings, etc, right? what's wrong with a slow shutter speed? And do you really need the ground glass? what if you *remove* the ground glass, the image will act as an object for the digicam. it should work. |
#4
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did anyone try this: cheap point-n-shoot on the back of a large format beast?
"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 this is large format camera here, not sports or action. we're talking landscapes, biuldings, etc, right? what's wrong with a slow shutter speed? And do you really need the ground glass? what if you *remove* the ground glass, the image will act as an object for the digicam. it should work. How will the "image act as an object" without the glass? |
#5
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did anyone try this: cheap point-n-shoot on the back of a large format beast?
In article Q2YPc.18274$Oi.4714@fed1read04,
"Mark M" wrote: "chibitul" wrote in message ... yes, that is what I mean. Most cameras have a macro mode, but you can also put the camera about 0.5 meters away from the ground glass. Ok, the image is dim, but this is large format camera here, not sports or action. we're talking landscapes, biuldings, etc, right? what's wrong with a slow shutter speed? And do you really need the ground glass? what if you *remove* the ground glass, the image will act as an object for the digicam. it should work. How will the "image act as an object" without the glass? optics 101. |
#6
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did anyone try this: cheap point-n-shoot on the back of a large format beast?
"chibitul" wrote in message
... How will the "image act as an object" without the glass? optics 101. You are, of course, imagining shooting the aerial image. Sweet dreams, chibitul. |
#7
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did anyone try this: cheap point-n-shoot on the back of a large format beast?
chibitul writes:
In article Q2YPc.18274$Oi.4714@fed1read04, "Mark M" wrote: And do you really need the ground glass? what if you *remove* the ground glass, the image will act as an object for the digicam. it should work. How will the "image act as an object" without the glass? optics 101. Sorry, you failed the course. The large format lens will form a real image in the plane of the focusing screen. The digital camera can focus on that real image. But you'll get an almost entirely dark frame, with a tiny bit of the image illuminated in the very centre. The problem is that, except right on the optical axis, the light that leaves the exit pupil of the large format lens reaches the image plane at an angle. Without a focusing screen, the light continues in the same direction and *none* of it reaches the P&S camera lens. No light, no image. Just try looking into the back of a large-format camera with your eye when the focusing screen is removed. The focusing screen takes the incoming light from the first lens and scatters it in all directions, which gives a dim image of the entire scene no matter where you place your eye. Sometimes a Fresnel lens just in front of the focusing screen is used to redirect more of the light towards some assumed eye position. In order to photograph an aerial real image like what is suggested here, it's not sufficient to have the second optical system focus on the real image formed by the first optical system. You also need to *simultaneously* form an image of the exit pupil of the first lens onto the entrance pupil of the second lens, in order to get the light where it will do some good. And that requires additional optics in between the first and second lens. Dave |
#8
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did anyone try this: cheap point-n-shoot on the back of a large format beast?
"chibitul" wrote in message
... How will the "image act as an object" without the glass? optics 101. You are, of course, imagining shooting the aerial image. Sweet dreams, chibitul. |
#9
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did anyone try this: cheap point-n-shoot on the back of a large format beast?
chibitul writes:
In article Q2YPc.18274$Oi.4714@fed1read04, "Mark M" wrote: And do you really need the ground glass? what if you *remove* the ground glass, the image will act as an object for the digicam. it should work. How will the "image act as an object" without the glass? optics 101. Sorry, you failed the course. The large format lens will form a real image in the plane of the focusing screen. The digital camera can focus on that real image. But you'll get an almost entirely dark frame, with a tiny bit of the image illuminated in the very centre. The problem is that, except right on the optical axis, the light that leaves the exit pupil of the large format lens reaches the image plane at an angle. Without a focusing screen, the light continues in the same direction and *none* of it reaches the P&S camera lens. No light, no image. Just try looking into the back of a large-format camera with your eye when the focusing screen is removed. The focusing screen takes the incoming light from the first lens and scatters it in all directions, which gives a dim image of the entire scene no matter where you place your eye. Sometimes a Fresnel lens just in front of the focusing screen is used to redirect more of the light towards some assumed eye position. In order to photograph an aerial real image like what is suggested here, it's not sufficient to have the second optical system focus on the real image formed by the first optical system. You also need to *simultaneously* form an image of the exit pupil of the first lens onto the entrance pupil of the second lens, in order to get the light where it will do some good. And that requires additional optics in between the first and second lens. Dave |
#10
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did anyone try this: cheap point-n-shoot on the back of a large format beast?
"chibitul" wrote in message
... How will the "image act as an object" without the glass? optics 101. You are, of course, imagining shooting the aerial image. Sweet dreams, chibitul. |
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