a BSI sensor riddle

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Bernard Delley Senior Member • Posts: 1,031
a BSI sensor riddle

I would have thought that the technical challenge of back  illumination was taken for the benefits  of improved light gathering. So I would expect a higher quantum efficiency for a BSI sensor.

For  very similar pixel sizes, Bill Claffs DXO derived sensor characteristics shows

Nikon D500  (standard sensor chip)  QE = 60%

Nikon D850 (back illuminated sensor) QE = 44%

That lower QE is counterintuitive by my expectations see above. So what is wrong ?

Nikon D850
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