possibly interesting 7D maze observation

Started Oct 12, 2009 | Discussions thread
ejmartin Veteran Member • Posts: 6,274
ISO 100 gains

Based on the bottom row of the GMCC chart; haven't had time yet to analyze the colored squares in all channels, except for the B channel where the gain does not seem to vary with the color saturation:

Since this is so linear, I didn't bother evaluating all the squares of the GMCC chart for the other color channels, rather I used the bottom row of greyscale squares. These gave good linear fits for the gain at ISO 100, with the results:

R: 2.15 e-/14-bit RAW level
B: 2.26
G1: 2.04
G2: 2.15

The average is 2.15 e-/14bit ADU at ISO 100; this translates to .116e- per ADU per square micron at ISO 400, comparable to the Nikon D3's .113, subject to normalization of the ISO which requires a calibrated light source (this will likely have to wait for DxO's analysis of ISO normalization).

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