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If video on DSLR uses only part of sensor, how come I still get great DOF?

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Vic Noseworthy
If video on DSLR uses only part of sensor, how come I still get great DOF?
on Oct 23, 2012 at 11:41:33 am

Hi folks,
One thing I've wondered about is this:
From what I understand, when I shoot video using my Canon T3i, it uses only 1080 x 1920 of the (significantly!) higher resolution sensor. Yet, it's this larger sensor that gives me the bokeh I so love. Seems to be a conflict in the logic here. Can anyone explain how I get the bokeh afforded by a large sensor if only a small piece of the sensor is being used?
Thanks so much!
Vic


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Peter Burger
Re: If video on DSLR uses only part of sensor, how come I still get great DOF?
on Oct 23, 2012 at 12:31:30 pm

In 1080p and 720p your DSLR uses the full sensor but reduces the framesize through line-skipping. Only when you're shooting in SD, the center part of the sensor is used. This won't reduce DOF either because it's like extracting just a portion of the full-frame which still has the "full" shallow DOF.

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"Tragedy is a close-up; comedy, a long shot." - Buster Keaton

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Vic Noseworthy
Re: If video on DSLR uses only part of sensor, how come I still get great DOF?
on Oct 23, 2012 at 6:20:17 pm

Hmmm... interesting. Thanks, Peter. So, then, does this mean it also uses only a segment of each line, too? (Otherwise, wouldn't the ratio be off?)
Thanks again,
Vic


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Peter Burger
Re: If video on DSLR uses only part of sensor, how come I still get great DOF?
on Oct 23, 2012 at 7:36:13 pm

I'd say the camera crops the picture above and below.

------------------------------------------
"Tragedy is a close-up; comedy, a long shot." - Buster Keaton

Me on Twitter (english/german)
http://twitter.com/FastFoodVideo


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