QUOTE(wingster @ Oct 7 2010, 07:13 AM)
Haha thanks for correction , I'm actually dunno how to explain it well and something that still figure it out xD
But just 1 question that the Quick LV visual (the sensor) doesn't it with together with the Phase Detection sensor as well (on the top)?
well,
Albnok explained. but i think u are confused with that capturing sensor. IF (i say IF) the AF rely on that secondary capturing sensor, then its a Contrast Detect AF already~

it wont be Phase detect. Sony designed QuickLV so that, able to project image to the LCD and still able to use the Phase Detection in realtime. unlike others which has to close down the mirror in order for the phasedetection to work in split second, many nikon/canon user do not like LV, i)because of the delay, ii)many complained bad focus in lowlight(not enough time to hunt/lock). hence, when me meet other N/C 'fanboy', they will go around and talk about how real/Pro photographer uses OVF, not LV (or EVF) sucks... they just dont know what they are really missing, the
Quick LV.
so when u on QLV, the phasedetect sensor, and the top secondary capturing sensor are both activated, the top sensor is calibrated so that it fits nicely to view as like the OVF and share the same AF points.
BUT there is a Major diff when using LV and OVF, is the Metering sensor.
in OVF, it uses the 40-segment honeycomb metering sensor.
in LV, it uses the capturing sensor 1200-zone evaluative segment, which, is far better in giving more accurate metering. hence, Sony QLV is in fact, far more advance and reliable then N/C
cplow1, freddy manson: when added strobe (flash) in a photography, ur photo metering now is divide into 2 area.
i. the foreground,... aka the subject, usually being lit up by the flash....
ii. the background,... aka ambiance light...
the strobe, usually controls the foreground metering.... while, its the camera setting (the Exposure Triangle) that controls the background metering. how people play with highkey and lowkey must understand these key.
boosting up ur ISO, does brighten up the Background, hence why in early days of A300, a lot people love Canon's banquet shots, because they shoot at iso1600, where they have brighter (or same) background/ambiance light as the foreground, while those iso400 shooter(aka A300) will have 'dark' background. if u have A550, go iso1600 all the way, and u will definately felt like canon effect

Added on October 7, 2010, 12:28 pmanother way to add brightness to the background is to use, SlowSnyc Flash (or SL flash, or BL flash whatever other company name them)....
the metering will run base on the ambiance light, run the setting on ambiance metering, giving u slower shutterspeed(on low iso) so it will have enough time (slow shutter) to capture the backlight ambiance... but most people would like to avoid this, because it might cause a lot of ghosting image, and imbalance WB issue later on.
This post has been edited by ieR: Oct 7 2010, 12:28 PM