How is the video image pulled from the sensor?

Joined
Apr 30, 2009
Messages
227
Location
Seattle
I am wondering how are the images used in videos constructed from the sensor: does the camera only use a small part of it's total sensor area to form say, a 1080 pixel image, or does it sample the entire sensor (e.g. 16 megapixels for a D7000) then convert that image down to 1080?

My guess is the former, not the latter...

If this is true, is only a small central portion of the image circle from a given lens used to create the picture? If so, then even a DX lens on a FX sensor could form a full 1080 HD pixel image...
 
Joined
Oct 7, 2008
Messages
2,550
Location
Littleton, Colorado
yeah but if that as the case you would get an instant crop factor.

seeing as how the field of view does not change between video and stills, that means the whole sensor is being used.
 
Joined
Apr 30, 2009
Messages
227
Location
Seattle
You're right, I should have realized that. Did a bit more searching and it seems what happens is only every X lines (e.g. every 3rd line) from the entire sensor is used to construct the image.
 
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