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Mammatus From Frontal Clearance

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Author Topic: Mammatus From Frontal Clearance  (Read 454 times)
brianb
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« on: October 08, 2008, 12:39:17 am »

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any idea why the images are so grainy?. These are all ISO100 yet they look noisy and poor. I have noticed this trend for some time but ONLY when near dusk when the light level is low. At this time I seem to get this result and I have problem trying to get a focus. Yet during daytime I have no problems. My camera has a manual focus ring on the barel like a DSLR but it's not a truemanual, the manual movement triggers a digital focus which gives a slight delay before I see the result on the LCD screen. I wonder why it's so tempermental in low light.
I'm sure the noise is an effect caused by the sensor being so small - it's just quantum noise. AF mechanisms all struggle in poor light to some extent, too, but the bigger the sensor elements, the better.
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