Originally Posted by
arash_hazeghi
Hi Gail,
I am not sure about the connection between a camera and a computer "techie" whatever that means, but you misunderstood the Canon literature : They are talking about the standard sub-mirror as I mentioned above. maybe you weren't aware but all SLR cameras have a small secondary mirror behind the main mirror that is called the sub mirror. Its function is to send light to the AF sensor when the mirror is down (otherwise camera can't AF). Canon is saying they have improved the sub-mirror hinges and frame for better AF stability and claim that has made the whole mirror box mechanism more robust and also reduced the mirror "up" time. They don't claim the total black out time is any better than the 1DX II or the vintage 1DX when shooting a burst. elsewhere I read 10% faster mirror return, the 1DXII blackout time was 48msec this puts the 1DXIII at 44 msec
We can do the math Canon did not disclose
the total black out time is simply the number of frames per second x black out time per frame
1DX II 14 x 48 = 670 msec per second of burst
1DX III 16 x 44 = 700 msec per second of burst
the total black out time is longer for the 1DXIII simply because it shoots 2 fps more
The 1DXIII is blacked out 70% of the time when shooting at 16 fps but the human brain can compensate for the black gaps by stitching the bright scenes and give an impression of a continuous image (same concept as a flip book or kineograph) . That's why it doesn't feel as bad in practice. The impression of the black out time will vary from person to person, and younger folks will notice the black out more... more importantly during the period the mirror is up the AF is blind.
hope this clarifies.