changing the exposure manually

Qarik

assuem you are in manual with fixed aperture, iso, and shutter speed. When you change the EV value by say +1/3 or -1/3..how does tha camera actually do this:

1) with flash

2) with no flash

I can imagine with flash the camera simply changes the flash length/power by an appropriate amount. But without flash..how? Is it somehow post processed in the camera software? If that is the case then is that no better then PP in PS? Also if it is post processed then it shouldn't be in the raw file? But I think RAW still captures the the +/-.

Qarik

I don't have my manul awith me but I just had a thought..EV correction does not work in manual mode right?

ivar

when you are in full manual mode, you can't change the EV, unless i'm misunderstand your question.

EV is used on camera, when the camera has to compute at least one variable (ISO, shutter, aperture). It calculates what it thinks is the proper exposure first, and then ups/downs it by the selected amount (there may be a more technical explanation, but this is how i remember it).

When in full manual, it doesn't have anything to change. You already selected the shutter/aperture/iso. On Canon cameras (at least that ones I have), the button that normally changes the EV, now changes something else, like aperture.

Does this help at all? Did I understand your question correctly?

Qarik

I'll have to double check on my d90 maunl when I get home but I think you are correct. you have to be in A,S, or P mode I imagine for the EV correction to work.

ziggy53

I think you mean "EC" as in "Exposure Compensation" value.

I do believe that most cameras do not allow EC in manual mode.

At any rate changing the EC may not affect flash output necessarily. The "FEC" is used to change the flash output.

Toshido

On my rebel XT the Exposure compensation turns into exposure bracketing in Manual mode.

but that does raise an interesting question I will be experimenting with. What does the camera change to bracket the exposure in that case???

of course that is likely the same answer to your question...

I looked at a couple pictures of my christmas tree that i took in manual with exposure bracketing. Looks like it changed the shutter speed.

I know not the actual answer you are looking for but you asked a trick question, we think...