Anyone else see this with their 20d raw images at 1600?

I've seen this (occasionally) on a few test shots at 1600 raw images

(but not with the embeded jpegs, either large/fine or med/fine) I

have not yet used the noise reduction feature yet.

 

What on earth is that strange pattern of discoloration, and why does

it only occur on the raw images and not the embedded jpegs?

 

I searched the archives and found nothing of this nature mentioned

with the 20d.

 

Thanks<div></div>

FWIW:

EXIF data: Aperture priority 1/250@f1.8 with 85mm f1.8

ISO 1600

Raw/med jpeg

Contrast mid high

sharpness mid high

color saturation mid high

w/b Cloudy

All custom functions 0

Take a look at this:

http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00ASLM

Hi Eric, If it's not the most recent, you might try flashing your 20D's firmware. There was an "issue" with banding at high ISO values in the earlier versions. Good luck!

Check the reference given by Mike. General view is that it is a conversion issue not a camera issue, and it is the latest versions of EVU/DPP that fix it (see Canon's own upgrade information for these pieces of software).

<p>This is the famous conversion issue which was corrected a month or two ago. Update your raw conversion software.</p>