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#1
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Synchronization
Is there any material available on how to synchronize the shutters of two
disimilar cameras? I would like to take my two cameras and try to construct a digital stereo camera, but I haven't the slightest idea of how to sync the shutters. |
#2
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On 2005-05-11, dah_dah wrote:
Is there any material available on how to synchronize the shutters of two disimilar cameras? I would like to take my two cameras and try to construct a digital stereo camera, but I haven't the slightest idea of how to sync the shutters. The traditional approach is to use mirrors or prisms to put the two stereo images onto a single frame in one camera, or use a single shutter with two (or more) lenses, possibly in a specially-built camera. If your subject is static, then you can use one unmodified camera and move it between the 'left eye' and 'right eye' positions - there have been tripod gadgets marketed for that purpose. I have seen home-made cable-release gadgets where two cameras can be 'fired' by pressing a single lever - but that wouldn't synchronise the shutters with any great precision, even if the cameras were from the same batch of the same model. Certainly an interesting idea ) -- -- ^^^^^^^^^^ -- Whiskers -- ~~~~~~~~~~ |
#3
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Whiskers wrote:
On 2005-05-11, dah_dah wrote: Is there any material available on how to synchronize the shutters of two disimilar cameras? I would like to take my two cameras and try to construct a digital stereo camera, but I haven't the slightest idea of how to sync the shutters. The traditional approach is to use mirrors or prisms to put the two stereo images onto a single frame in one camera, or use a single shutter with two (or more) lenses, possibly in a specially-built camera. If your subject is static, then you can use one unmodified camera and move it between the 'left eye' and 'right eye' positions - there have been tripod gadgets marketed for that purpose. I have seen home-made cable-release gadgets where two cameras can be 'fired' by pressing a single lever - but that wouldn't synchronise the shutters with any great precision, even if the cameras were from the same batch of the same model. Certainly an interesting idea ) I think you need to set the two cameras up with a common release mechanism, and then take a few shots of a moving object on a calibrated background, ideally moving vertically so that the camera separation is ignored. Then you can see which camera fires first, and by how much, and adjust the release mechanism to get the best sync. You will of course also have to set the images to the same format (zoom, pixel count &c) and ensure the two images are equally exposed. Good Luck! |
#4
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In article ,
peter wrote: I think you need to set the two cameras up with a common release mechanism, and then take a few shots of a moving object on a calibrated background, ideally moving vertically so that the camera separation is ignored. I'm just imagining what Muybridge must have gone through, to accomplish what he did. And he did it with naked college girls hanging around while he messed with his gadgets too. |
#5
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On 2005-05-13, james wrote:
In article , peter wrote: I think you need to set the two cameras up with a common release mechanism, and then take a few shots of a moving object on a calibrated background, ideally moving vertically so that the camera separation is ignored. I'm just imagining what Muybridge must have gone through, to accomplish what he did. And he did it with naked college girls hanging around while he messed with his gadgets too. Took him years. -- -- ^^^^^^^^^^ -- Whiskers -- ~~~~~~~~~~ |
#6
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Unless your subject is moving, the bigger problem is getting the images
properly registered to each other. The focal lengths have to be almost exactly the same. The image distortions (all lenses have some distortion) have to be similar enough to not destroy the intended effect. The cameras have to have very nearly parallel sensors. The exposures have to be reasonably close (minor differences - less than 1/3 of a stop - can be PS'd out, but larger differences will be a problem). A lot easier to do those three with identical cameras (or, as I do, using a single camera that gets shifted laterally). Austin |
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