toxic wrote in post #10755105
I'd rather have longer shutter lag and no viewing lag than viewing lag and shorter shutter lag.
Viewing lag + shorter shutter lag = "I can document the fact that I missed the decisive moment without delay"
bjyoder wrote in post #10769637
And - something I just thought of - you'd still have blackout while the shutter is moving across the sensor to make the exposure, hence defeating the pellicle mirror again.
I know you wrote this comment BEFORE the official news release, but Sony is using pellicle mirror very differently than how pellicle mirror was used in the Canon EOS RT and Canon EOS 1N RS. Sony uses it for continuous AF, while Canon used it for continous viewing (through the optical viewfinder).
In Sony's case, the pellicle mirror is NOT needed for continuous viewing, since that job is done by the sensor/EVF (similar to all the point-and-shoots out there, but hopefully with less lag).
In fact, because of the dependence on EVF, I highly suspect that at higher shutter speeds (anything faster than max X-sync), electronic rather than mechanical shuttering will be used. Trying in use mechanical shuttering at faster than max X-sync speed would have shown the slit travelling across the sensor.
Since I got my 7D, other cameras don't impress me much (the 5D2 and the 1-series don't tempt me either), but this "phase-detection AF during video" thing definitely got a "wow" out of me.
They did a good job marketing the A55 in this video. One is made aware of all the major selling points of this camera A LOT faster reading a 17-page review.
Obviously, the video is meant to praise and sell the camera, while the various reviews offer a much more balanced perspective.
toxic wrote in post #10781539
Why should 10fps be restricted to AE? IR says the aperture must be "locked" to "[remove] the delay required to set and reset the aperture to allow focusing between shots." Why is the aperture an issue? Every SLR lens has to move its aperture blades continuously. Do Sony lenses really not stop down and open up fast enough?
Phase-detection AF works by comparing light coming from different parts of the lens, which in turns requires the aperture to be opened wide enough to allow light from the "periphery" of image circle. This is why the usual "lens must be faster than F5.6 to retain AF" restriction we see all the time.
If you are shooting outdoors and using an aperture of F11, in order to AF again between shots, the camera needs to open up the aperture to F5.6 at least to allow phase-detection AF to work, then close it down again to F11 before the next shot. It may not be possible to do this "close down/expose frame/open up/AF/close down/expose frame/open up/AF" dance 10 times per second.
toxic wrote in post #10781539
DPR also says the 10 fps AE mode doesn't choose the best shutter speeds for action since it sticks to 1/FL. It would have been acceptable if it chose faster shutter speeds, but it apparently doesn't.
Since the max X-sync is only 1/160, does any one know if the A55 uses electronic shuttering with faster shutter speeds?
For those who don't remember, with shutter speeds faster than max X-sync, the leading and trailing shutter blades are no longer allowing light to strike the entire sensor at the same time -- the shutter blades form a slit, which travels across the sensor.
With EVF, I can't imagine the camera allowing you to watch this "slit action" as it happens. Perhaps this is why one is restricted to slower shutter speeds in 10 fps mode?
Anyway, gimmick or innovation, one must give some credit to Sony for trying something new. As others have said, hopefully this will trigger some response from the Big 2, allowing us to benefit without switching brand/system.
Competition is a great thing for us consumers. I sincerely hope Canon considers this new Sony at least slightly threatening.