And lo on Thu, 24 Jul 2008 10:21:19 +0100, Invisible <voi### [at] devnull> did  
spake, saying:

>>> But then, isn't film inherantly noisy too?
>>  Not really, not in the way digital image sensors are.
>
> Really? I thought film was well-known for being grainy at low light  
> levels...

Depends on the film, if I take a good photo using ISO200 film at 1/60th of  
a second I can can get the same exposure with the less grainy ISO100 by  
shooting at 1/30th or even ISO50 for 1/15th. Of course leaving the shutter  
open that long may not be what I want so I could switch to ISO400 for  
1/120th.

The larger the ISO the larger the grains in the film that react to light  
so the grainier it gets. Digital cameras don't have grains though, they  
have fixed-sized sensors. So to emulate the sensitivity they just up the  
gain and well you know what happens when you do that for tiny sensors.

-- 
Phil Cook

--
I once tried to be apathetic, but I just couldn't be bothered
http://flipc.blogspot.com

Post a reply to this message