[opendtv] Re: DSLRs Push HD Video Envelope
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 2 Sep 2010 17:17:55 -0500
Doug McDonald wrote:
> The basic advantage of a larger sensor is that you can if you
> wish put more photons onto it, resulting in better low light
> performance.
True. Less noise at high ISO ratings. But another big advantage is that you can
get more useful resolution out of a given lens. By moving the pixels further
apart in the sensor, the lens has an easier time of differentiating the amount
of light it transfers to adjacent pixels. So that, with a given type of lens
glass, lines from a test chart don't blur together as readily as they do in
very dense sensors. Which results in sharper images, with lots of contrast.
> It also allows you, if you wish, to get a narrower depth of
> field, very useful fro artistic effects. You can always get the
> same picture as a smaller sensor by stopping down the lens, if
> you want wider depth of field.
Yes, because for a given image acceptance angle, the bigger sensor needs a
longer focal length lens. Which in turn results in a larger aperture for a
given f stop (f stop = focal length/diameter of aperture).
The further you go from a pinhole camera, the less the depth of field.
Bert
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