This is part 8 in a series of posts on a prototype of the Kolari Vision thin-stack sensor modification for the Sony a7II. The series starts here.
The Leica 90mm f/2 Apo-Summicron-M ASPH is a great performer on the Sony a7x cameras. Its exit pupil is far enough from the sensor plane that the corners are generally sharp. How is it on the Kolari-modified a7II?
The scene, at f/2, with both a stock and a Kolari-modified a7II:
Same color shift we saw in the earlier pictures.
In the lower left corner, wide open and stopping down at whole apertures, enlarged 3:1, processed in Lightroom with daylight white balance and otherwise default settings:
Both sensors are doing a good job.
The Kolari is slightly sharper, probably the result of its lack of an AA filter.
Again. the Kolari is slightly sharper, probably the result of its lack of an AA filter.
Bored yet? I can tell you that the difference between the modified and standard sensor images as the lens is stopped down to f/16 remains the same. The Kolari mod doesn’t hurt anything with this lens, and helps a bit in this test — which has no obvious aliasing — because it omits the AA filter.
The f/16 images, showing a lot of diffraction, but still looking darned good:
A can’t resist emphasizing what a nice lens the 90 ‘cron Apo is on the a7II. I should also mention how difficult is is to get critical focus wide open with so little DOF available. I had to do focus bracketing to get this series.