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We've just received our review Sigma SD10 (after a little mix-up with the courier) and I'm happy to report that resolution is identical to the SD9. I decided to test this immediately after we read reports elsewhere that resolution was significantly lower because of the use of microlenses. In our own shots of a standard ISO resolution chart we can measure absolutely no difference in resolution between the SD9 and SD10 using the same lens at (almost) the same aperture.
As per our Sigma SD9 review we found the SD10's resolution to be identical, 1550 lines per picture height in the horizontal and vertical direction. Note that the difference in aperture (F9.0 vs. F9.5) is because of the change from 0.5 EV exposure steps on the SD9 to 0.3 EV exposure steps on the SD10. "Rumors of my demise have been greatly exaggerated"
|Sigma SD10 resolution chart
50 mm EX 2.8 mm Macro @ F9
|Sigma SD9 resolution chart
50 mm EX F2.8 Macro @ F9.5
|Sigma SD10||Sigma SD9|
"Rumors of my demise have been greatly exaggerated"