Originally posted by taks To rephrase my question above, can this sony sensor with "
Ricoh spected micro lens" made so that on-sensor PDAF would work with the light coming through the main mirror? I mean PDAF sensor below the mirror box on DSLRs works with the light passing through the main mirror right? It seems like it wouldn't be impossible for on-sensor PDAF to work with the dim light coming through the mirror. Is the light just not enough for on-sensor PDAF? Just curious why it doesn't work
(1) Would need some shutter re-engineering to have shutter parked in open mode.
(2) current mirror only has a smallish semi translucent area equal to AF focus point coverage so some light lost to optical viewfinder but not full frame.
(2) To implement, would need a semi translucent mirror a la what Sony did with their SLT Alpha cameras before Sony went down the mirrorless path. For Pentax this would split much more light between the optical viewfinder and the sensor assuming Pentax avails itself of the much wider array of focus points on sensors with pdaf functionality. Given Pentax desire for best experience from optical viewfinder, could they come up with a light split that gave good optical viewfinder experience while still giving enough light to the sensor for PDAF to work in low light given these sensors are designed for mirrorless (hence no light loss before sensor)? But for Pentax, mirror could still swing up for actual exposure so no loss of light for the recorded image, unlike how Sony implemented SLT.