Maybe this question is basic...
How are ISO's simulated on a digital sensor? Does the ISO setting
change the threshold signal for the sensor?
-Matt
-----Original Message-----
From: olympus-owner@xxxxxxxxxx [mailto:olympus-owner@xxxxxxxxxx] On
Behalf Of Chuck Norcutt
Sent: Thursday, March 09, 2006 8:10 AM
To: olympus@xxxxxxxxxx
Subject: [OM] Re: E-1 ISO 800 Acceptability
Ah! Just as I suspected. Your 1/8 sec. shutter speed on this shot is
substantially longer than CH's 1/320s shot. Another thing that I think
can contribute to noise is having the camera turned on for a long time
and the sensor be warm.
The comparison Canon shot is not only shot at 1600 vs 800 but it also
has a shutter speed 4 times as long at 1/2 sec.
Chuck Norcutt
Wayne S wrote:
>
>>In your example, I would wonder a little about movement and blur as
>>contributing some negative effect. And perhaps I am just insulating
>>myself from the devasting Heartbreak of Noise, but viewing at 100% is
>>not natural to me. At 100% ISO 800 will definitely suffer in
>>comparison.
>
>
>>http://www.zuik.net/E1/800iso_A147882.jpg
>
> I'm sure there was some movement - shot with 14-54 at 54, iso
> 800, 1/8 speed, f/4, spot metered, and using manual focus,
> handheld. It was this experience, one week before my daughter's
> wedding, that caused me to pull the plug on the E-1. I just couldn't
> live with the uncertainty in the performance of the camera. This is
> on the more extreme end of shooting, but an important one if shooting
> events.
<snip>
>
> I'm sure there are many that would beg to differ and I love Olympus
> cameras as much as anybody. But I needed results I could depend
> on. So, one week later, at my daughters wedding,... here is a similar
> exposure with the 5D (again 100% crop):
>
> http://www.zuik.net/E1/1600iso_MG_0276.jpg
> 5D, Iso 1600, F/4, 1/2 sec at 38mm focal length with 28-135 IS lens.
>
> This is 1 stop faster iso and the image is perfectly usable. The
> E-1 would have to be iso 400 or lower to match the performance.
> You combine that with IS and that is a lot of difference for this type
> of shooting. The 5mp versus 12mp is not that big a deal to me
> compared to noise performance.
>
>
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