Yes, the LCD runs directly off the sensor in live view. Whether the LCD
can be run by the sensor during exposure is a technology implementation
question but one which I think is immaterial to the discussion. As
Moose pointed out yesterday it may well be necessary for the shutter to
be closed and then reopened to effect the exposure. That's typically
required on "full-frame" sensors (where the term full-frame here is a
sensor design point and has nothing to do with sensor size).
But even if the shutter needs to close momentarily (to dump the charge
on the sensor's capacitors in preparation for the real exposure) that is
no reason to lower and raise the mirror again (which causes vibration
during what is probably a macro shot). The only reason to lower the
mirror is to a) get to the phase detect autofocus sensors or b) the
metering system's photocells because both the metering cells and phase
detect sensors are in the pentaprism area. But with manual focus and
manual exposure control... there's no reason to go there.
Chuck Norcutt
Joel Wilcox wrote:
> On Wed, Jun 30, 2010 at 2:26 PM, Chuck Norcutt
> <chucknorcutt@xxxxxxxxxxxxxxxx> wrote:
>> No metering involved if the camera is set to manual exposure control.
>> And autofocus can be performed with the mirror up buy using contrast
>> detect autofocus on the E-420, E-520, E-620 and E-30. But again, manual
>> focus can be performed on any of them with live view. My question
>> specifically requested detail of operation in manual focus and manual
>> exposure control. The camera shouldn't care about lowering the mirror
>> to take the exposure because there's absolutely no reason to do that.
>> And on the later models there's no reason to do it even in autofocus.
>
> The LCD runs off the sensor. It can't be running the LCD while the
> actual exposure is made, can it?
>
> I *think* it works like this: In LV the sensor runs the LCD until the
> shutter is triggered. Once triggered, the mirror drops, the LCD is
> cut off from the senor (blackout) and the exposure is made via the
> sensor like any conventional SLR, saved to card while at the same time
> there shows a brief (2 seconds, roughly) confirmation view of the shot
> just made to LCD, followed by return to LV.on the LCD.
>
> Sorry if I'm missing something here.
>
> Joel W.
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