ASI585MC Quantum Efficiency

Smillerman

I'm looking at the ASI585MC quantum efficiency chart and it seems really high for absolute quantum efficiency.

I have data on CMOS sensors going back years and including very recent ones and typically you have a peak mono CMOS sensor efficiency of 91-94% for modern CMOS sensors and the CFA (color filter array) dyes typically peak at 85% (plus or minus). And the peaks don't always align, but even if they do, the total is usually maxes at ₇₅-80% peak for green in absolute quantum efficiency for a modern color CMOS cameras.

So how am I supposed to interpret this chart? If it is, in fact, the absolute quantum efficiency then it's so much higher than anything I've seen! Going from 75-80% to 91% in one generation? That's why I ask, I'm trying to understand how this really compares to my ASI485MC.

Tech@ZWO

Smillerman Sony improves the technology to get higher sensitivity, and the sensor is more sensitive to green, so the peak is usually at the green band.
Here is an article for your reference.

https://www.sony-semicon.com/en/technology/security/index.html#link-01

Smillerman

Thank you for the information and the quick reply. I had reviewed Sony's material and I see they should have improved sensitivity in the near infrared. I expect the mono version of the camera to not have as much of a drop in mono QE as you approach near-infrared.

But that still leaves the question. Is that chart absolute overall quantum efficiency of the camera?

Thank you!

Tech@ZWO

Smillerman Yes, it is.

Smillerman

Thank you!