why not f/1.2 by Sony?

Started May 14, 2013 | Discussions thread
forpetessake
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Re: why not f/1.2 by Sony?
In reply to ilza, May 19, 2013

ilza wrote:

The photons need to follow a path through the sensor, past wires (DSLR sensors are not BSI)  before they can be counted at the photodiode, and that path is sensitive to angle of incidence, more on some sensors that on others. Quantum efficiency is not a single number; it is dependent of the angle the light strikes the sensor/microlens system.

Shadows of the wires will be longer with oblique illumination indeed.  But since wires (as visible from the sensels) form a rectangular skyscraper landscape, would not this rectangularity be visible on the shape of bokeh?  (When everything settles down, bokeh is, AFAIU, only “the shadow of the entry pupil” on the sensor.  So everything which effectively affects the entry pupil should be visible on bokeh)

Until this relation with bokeh is clarified, I like my microlenses conjecture better.

Yep, it's been explained elsewhere that the effect on t-stop is due to heavy vignetting (compensated in software). Vignetting is both natural effect of the large aperture lens as well as microlens design. It's not pronounced in the old sensors without microlenses, nor in the new designs with shifted microlenses.

Since we are discussing Sony NEX design here, there are test pictures that show that there isn't a heavy vignetting even at f/0.85, much less at f/1.2:

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