SONY ALPHA 7S - MEASURES
Any use of one of these images other than strictly private must be subject to prior authorization from legault@astrophoto.fr
Measures obtained on raw files (.arw) using Iris (christian
Buil) after conversion to DNG with Adobe Camera Raw.
Photosite capacity at
100 iso:
157000 electrons.
Read noise (below) strongly
drops at 2000 iso to reach 1 electron or even less at high iso. Seetings over
102400 iso are useless.
The drop of read noise at 2000 iso causes an increase of the dynamic range:
Camera Raw converts them to DNG 14-bit linear raw files but the histogram below
shows that only even values are used (13-bit data).
However, in continuous
drive mode data drop to 12-bit.