ADU research

Was curious about some of the more technical aspects of the chip in the Canon 40D. Found an informative page...

http://www.astrosurf.com/buil/50d/test.htm

Some very good comparisons. Charts and graphs.

• effective sensor size: 22.8 mm x 14.8 mm
• pixel dimensions: 3888 x 2592
• pixel size: 5.7 microns
• data coding: 14 bits
• inverse electronic gain at ISO 400: 0.84 e-/ADU
• readout noise at ISO
• 100: 5.66 ADU (19.0 e-)
• 200: 6.31 ADU (10.6 e-)
• 400: 8.15 ADU (6.8 e-)
• 800: 12.59 ADU (5.3 e-)
• 1600: 21.37 ADU (4.5 e-)
• bias level: 1024 ADU
• thermal signal at 22°C: 0.13 e-/sec
• full capacity: 12,900 electrons
• dynamic range at ISO 400 (full capacity / readout noise): 1900

Dietmar reminded me that software (e.g. MaximDL) would still be required to determine the ADU of an image.