So.. what exactly to you want? Turn off the live view on you A650, but keep the LCD on & the data displayed?
---Exactly, as I said, on the Rebel Xsi. ---
I dont quite see what purpose that would serve. Most of the energy is used by the LCD backlight, and furthermore, when you disable the live view, how should the camera determine the exposure values? How should if focus? DSLRs have dedicated sensors for light metering or focusing, P&S cams do that with their main sensor.
--- Now this is a different matter, you mean that "after" and "with" the image posted to the live LCD it is metered and taken exposure and relevant data? I dont think so, I would say this is taken at sensor level, but then I am just guessing, I am not expert, in fact I know nothing about how this things work.
But how does it manage to keep the data after the LCD is switched off (I have it in 10 secs)? In fact you can have the LCD turned backwards against the body (closed) and the shot would be taken anyway.
Just to make myself sure, I went and took some shots "with" the LCD off, I was able to see and change aperture or other values and then focus and speed was adjusted by the camera (this went black, could not see the data), so, no need to have the image "in" the lcd to make calculations. the pictures looked perfectly good. -----
Disabling the image on the screen would save exactly no energy at all. pointless.
--- I dont care too much about energy, I think is good to concentrate on the data, and not the little LCD, you might be good at seeing it but to me at quite some years and wearing glasses it is practically impossible to see the imaged focused or not.
Thanxs for your answers, it is always good to do some brainstorming. ----
