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720 need more light?

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Sam Behrens
720 need more light?
on Mar 7, 2009 at 1:33:16 am

Someone who probably should know, said 720 is slower (aperture wise) than 1080. This sounds "off" to me. Is he right? Do you need more light when recording 720 than you would need when recording 1080?

Many thanks,
Sam Behrens


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John Sprung
Re: 720 need more light?
on Mar 7, 2009 at 1:45:55 am

Given the same size chips (say 2/3"), dividing the surface up into 720 rather than 1080 would make each photosite bigger. So, you should be collecting more photons per location, which would make the 720 faster rather than slower. It should go by area, which would make it about a stop. 720 is just under 1 meg, 1080 just over 2 megs.




-- J.S.




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