All Sony Alpha A-Mount Cameras Going Mirrorless in 2014? | News | Forum
The translucent mirror concept was tried by Canon in their Pellix SLR way back in the 60's, and it had failed to take off. I'm surprised that Sony should have even thought of this for their DSLRs. If light transmitted by the lens is split two ways, one for viewing and the other for recording, it stands to reason that each function will receive less than 100% light, which is unacceptable for either of the two functions.
Technology changes a lot of things in the last 40 years. In the 60's, people listen to playback music thru 8-track tapes or plastic records, not to mention the size of the devices to play them. Now, even little kids could listen to music in a less perfect sound format, MP3, on their little mobile devices. Although sound quality in MP3 format is not as good as in MD, CD, nor records, it works and it works well enough for the majority. Same to the translucent mirror technology, it did not work with Canon, but it works well enough with Sony, especially in continuous focusing for video shooting. There is of course drawback in 1/3 stop of light loss to the sensor, that is the reason Sony decides not to keep that concept further, but to go fully mirrorless.
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