Hi,

The figures you give on 6 micron sensors are pretty low (27k resp 33k unnormalized).

Oops, you're right Erik - thanks for checking the figures. I had copied my formula for readnoise normalization and forgotten to take out the sqrt() factor. With the corrected formula, the picture changes somewhat:

Dalsa 7.2 micron sensors ~ 86k [but 33MP FTF5066C only 74k]

Fill Factory 11.4 micron ~ 87k

Kodak 6 micron sensors ~ 92k

Kodak 9 micron ~ 100k

Kodak 6.8 micron ~ 105k

Dalsa 6 micron ~ 112k

Dalsa 9 micron ~ 170k [but FTF4027C only 76k, so big variation]

Dalsa 12 micron ~ 197k

The effect of the correction is to pull back the largest pixels (> 9 micron) and raise the smaller pixels.

Again, Dalsa's overall trend is still downwards with time.

Again, each Dalsa generation still does better in general than each Kodak one, apart from the oddly poor numbers for the 7.2 micron Dalsas.

Kodak's numbers cluster together more, and the initial modest improvement from 9 to 6.8 microns was followed by a bigger step backwards from 6.8 to 6 microns.

Where did you get the figures from? I have not found data for those sensors, probably because I was not looking at right place.

I got all the Kodak and Dalsa ones on their respective websites. The Fill Factory figures were in an academic paper of theirs.

In the case of 4 of the Dalsa sensors, they don't state the FWCs in electrons, preferring for some reason to use voltage units, but it's easy to calculate them from the gain.

The 60MP Dalsa datasheet (as used in the P65+/IQ180/Credo 60) has only been made public in recent weeks. It actually

has microlenses! How strange that that information is totally absent from all the Phase One documentation on their backs using this sensor! I don't think that even the Phase One dealer/experts here (Doug, Steve etc.) knew about that: when describing which backs are suitable for view camera use and why, the Kodak 18MP and 31MP microlensed sensors were the only ones that they would rule out.

Thanks again for spotting my normalization error.

Ray