You have to be careful with corrections. Once you post one, other errors show up. It's like one raindrop being followed by many others.
Anyway, I am wrong as rain about the Sony SLTs. They are not traditional pellicle-mirror cameras like the Canon Pellix or EOS RT, that use reflected light for an OVF...they are mirrorless cameras with a mirror added to divert some of the image-forming light for focusing purposes. The light hitting the sensor is used for an EVF. Yikes! How did I not know that? I have never held or used a Sony SLT camera, but that's no excuse. Thanks to Jack for setting me straight on that one. (And, why does Sony need to do this at all any more, given the existence of integrated phase-detection sensors?)
And Hektor was not Oskar Barnack's dog, Hektor was Max Berek's dog...which makes much more sense, since Max Berek designed the early Leica lenses including the Hektor. David Babsky set me straight on that.
Today is Friday, right? And my name is really "Mike"? Sorry for the errors. Fire the fact-checker!!
(Thanks to Jack and David)
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Kevin Purcell (partial comment): "Re: 'And, why does Sony need to do this at all any more, given the existence of integrated phase-detection sensors?' In fact the A99 Mark II does use both 'traditional PDAF' and 'on-sensor PDAF' for focusing. The large pixels used in 'traditional PDAF' sensing, as used in conventional DSLRs, are more sensitive, are monochromatic, and can be sensitive to near-IR light. All of these features help determine the level of in-focus/out-focus and direction of focus, accurately and rapidly. In the A99 Mark II, Sony are claiming they can AF at light levels down to EV –4. That's focusing on a subject illuminated by the moonlight from a gibbous moon. As lines or crosses of pixels in the PDAF sensor are larger than on-sensor PDAF sensor, they can deliver more accurate distance information. In rangefinder terms they have a ,longer baseline.' There is a good explanation at this link, so I don't have to type it."