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Old Aug 8, 2006, 7:12 AM   #1
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A previous message said you cannot preview images on a D70 connected to a video monitor. Presumably, this is due, at least in part, to the fact that the image is not reaching the detector because the mirror is down until an exposure is taken. Is there any way around this that will allow previewing? It seem possible, in principle, if the mirror can be locked in the up position either by using the bulb exposure setting or by a specific mirror lock function. I seem to remember this being possible with my Nikkormat.My specific goal is previewing images on our new D200 connected to various microscopes. I was originally told by a very reputable, local, pro-level camera store that mounting the D200 on a microscope mount would prevent any light metering function. However, using the D200 Non-CPU Lens settings and guessing at the maximum effective aperture allows light metering just fine. I am now skeptical of all claims that this camera cannot do this or that. My only option is to try it and see.Previewing would greatly expand the flexibility of the D200 in this particular application. I know Nikon and others sell specific cameras that allow previewing for photomicroscopy. We have several. However, the dslr is much more flexible because it can also obviously be used in many other settings off the microscope. The dslr is also much less expensive.Thanks for any specific suggestions or general thoughts on this issue.Dave
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Old Aug 8, 2006, 8:13 AM   #2
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No, it is not possible. The sensor is not designed for continuous sampling. You set it, make an exposure and then it tells you how much light was recieved at each pixel site. This is why dslr cameras cannot use the screen for preview (though there is a minolta that uses a second sensor built into the main one for this purpose). Point and shoot type cameras use a sensor chip designed for video cameras and so don't have this limitation.
The workaround is to have a small video camera mounted over the eyepiece of your dslr and then use the images it produces to preview. There is a company that makes a device exactly for this purpose but I'm afraid I can't remember what it's called ...
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Old Aug 8, 2006, 8:19 AM   #3
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jacks wrote:
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No, it is not possible. The sensor is not designed for continuous sampling. You set it, make an exposure and then it tells you how much light was recieved at each pixel site. This is why dslr cameras cannot use the screen for preview (though there is a minolta that uses a second sensor built into the main one for this purpose). Point and shoot type cameras use a sensor chip designed for video cameras and so don't have this limitation.
The workaround is to have a small video camera mounted over the eyepiece of your dslr and then use the images it produces to preview. There is a company that makes a device exactly for this purpose but I'm afraid I can't remember what it's called ...
Actually, the DSLR with live preview is an Olympus.
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