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Old Feb 13, 2004, 5:21 AM   #1
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Default Video clip with Zoom

Does any digital camera allow zoom to be used for video clips? Normally, this function is disabled for video clips. Thanks. Mathew
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Old Feb 13, 2004, 8:00 AM   #2
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Default Re: Video clip with Zoom

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Originally Posted by Mathew
Does any digital camera allow zoom to be used for video clips?
All cameras equipped with real, manual zoom instead of motorized zoom: Minolta Dimage 7xx, A1/A2, Sony F828 etc.
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Old Feb 16, 2004, 4:12 AM   #3
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Thanks. These are costly cameras. What about the low-end cameras, i.e. below US$ 300 level. Thanks again. Mathew
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Old Feb 16, 2004, 5:20 AM   #4
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..........All cameras equipped with real, manual zoom instead of motorized zoom: Minolta Dimage 7xx, A1/A2, Sony F828 etc........

I'd be surprised if the movie quality is any good and file size workable. Most cameras are using motion JPEG and disable the zoom because there is no motion estimation prediction or compensation to handle the scene changes frame to frame, same is true of panning. Their internal processors can't keep up with this kind of fast changing data and output file sizes would be huge if they could. This is what MPEG compression was designed for.

A camera which uses the MPEG system of compression for movie should be OK and I would expect the zoom to be enabled, as with any DVcam.

So I'd look first at the traditional DV movie cam makers - Panasonic, Sony etc and see if they are using MPEG for their movie compression standard in still cameras. VOX
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Old Feb 16, 2004, 10:00 AM   #5
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Cameras without sound have no problem with electric zooms operating during recording. With sound they disable the zoom because it makes noise in the movies when the zoom is operated. Manual zooms donít have motors to make some of the noise and they couldnít be deactivated in any case.

I was reading of a new model electric zoom camera recently that would zoom while recording but canít remember what it was since I wasnít interested in the camera. I donít think it was an entry-level camera though.
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Old Feb 16, 2004, 10:33 AM   #6
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The Sony F717 has a motorized zoom and it also records MPEG video with sound. The zoom can be used while recording video. I haven't had problems with mechanical noise in the recordings. This is probably because the microphone is on the top of the camera body, and the lens is a separate assembly that probably doesn't transmit much vibration to the rest of the body. Also, the lens is pretty much silent for zooming. The motion is all internal, and it can only be heard if I put my ear right up to the lens barrel.
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Old Feb 16, 2004, 10:59 AM   #7
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Manufacturers like Sony and Matsushita have considerable experience in the pitfalls of designing consumer cams for movie. Manufacturers like Nikon and Minolta probably have their strengths in optics, features and camera handling. New market entrants with trading partners specialising in other areas like chips or computing technology come along (at the moment it might be Mpix that sells), but it doesn't always guarantee a 'photographers camera' as the end product. I think that's why there is still this performance compromise between a camera built for stills, and one built for movie. VOX
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