However, the image size overrides have no effect, they remain at the 1200x1600 size. I would like to see if it is possible or not to override this and use larger image sizes or if it's inherent to the whole mode itself.
On many cameras, ISO 1600 is not different in what the sensor gets than ISO 800. The only difference is that the camera is brightening it in software. So don't waste your time with ISO 3200, just shoot raw an adjust the exposure in your raw processing program.
I believe the high speed is a directly result of the lower resolution. That's why I assume it is something like binning, that reduces the resolution very early in the process.Note that other lower resolution settings are generally not much faster than full size. Not coincidentally, their raws are full sized. If you set 640x480 in the menu, a CHDK raw is still full sensor resolution, and maximum shooting rate isn't dramatically faster than shooting at much higher res. AFAIK, some of the lower resolutions are actually slower on some cameras.
Reading about it, that seems likely. Was hoping that there was some potential to add a bit of speed to larger images, at least CHDK allows the other overrides to work, I'm just stuck with smaller images for now.
Quote from: emmanuel on 24 / March / 2009, 02:51:31 However the very strong iso3200 noise reduction appears to be applied anyway, which gives a picture almost as bad as real iso3200. am i doing something wrong?BTW, RAW resolution in ISO3200 mode is only 1248x938 (1.1MP), but it still 12-bit .Maybe Canon's 1600x1200 is interpolated.
However the very strong iso3200 noise reduction appears to be applied anyway, which gives a picture almost as bad as real iso3200. am i doing something wrong?
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