Just thought I'd post this to show what the noise is like on the EOS 40D at ISO 3200..
Portrait of someone from my college class with only a modelling light as the light source..
First shot is the processed image, the second is the unprocessed RAW file (well converted to TIFF and resized, nothing else)
Here's the exif (and yeah I've left the green filter on the B&W setting, but PS Camera Raw discards the image style info anyway..)
File Name IMG_1068.CR2
Camera Model Canon EOS 40D
Shooting Date/Time 29/04/2008 20:28:44
Shooting Mode Manual Exposure
Tv( Shutter Speed ) 1/125
Av( Aperture Value ) 4.0
Metering Mode Evaluative Metering
ISO Speed 3200
Lens EF50mm f/1.8 II
Focal Length 50.0 mm
Image Size 3888x2592
Image Quality RAW
Flash Off
White Balance Mode Custom
AF Mode Manual focusing
Picture Style Monochrome
Sharpness 5
Contrast 4
Filter effect G :Green
Toning effect N :None
Color Space sRGB
Long exposure noise reduction 1:Auto
High ISO speed noise reduction 1:Enable
Highlight tone priority 0: Disable