Quote:
Originally Posted by gregbradley
You sure its lower QE? I don't think so.
The D850/Z7 Panasonic S1R/Sony A7rii/Sony A7riii is a slightly modified Sony A7rii and iii sensor which is still the highest rated sensor on DXO Mark. Its BSI, has copper wiring, has refined microlenses and dual gain analogue to digital on chip converters.
The QHY367 is the older 36mp full frame sensor and for sure less QE as the A7riii sensor is backside illuminated with a larger surface area for light to hit as the circuitry is underneath. It also does not have the copper wiring which was a later Sony development.
The latest you-beaut from Sony that is not even in their own cameras yet is the QHY600 which is the next gen full frame backside illuminated (BSI) 60mp super fast readout sensor from Sony. I would expect to see that sensor in the upcoming Sony A7Riv camera probably coming out towards the end of this year or early next year.
That sensor is also available as a stacked sensor meaning they weld a DRAM memory chip on the back of it like in the Sony A9 which gives very fast response time and allows various features none of which would be that useful for astro but perhaps for planetary (60mp though is too large for planetary I would think).
Its the direction Sony is going in.
Greg.
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I went and re-read
this thread on CN and I think I remembered a few snippets but not the context. I do agree with you that the BSI sensor in the D850 should have a higher QE due to the architecture so possibly what was being suggested towards the end of the thread is that the D850 has a lower QE compared to some of the other BSI DSLR sensors on the market at the moment.