firstmoon said:
really, how does a camera do it?
does it change the shutter speed? or the aperture? does it depend on the camera mode eg A, M, P or S (or Tv)?
View it as this way:
P: Full Auto
S: Half Manual
A: Half Manual
M: Full Manual
In S mode, it shutter prioity. You adjust the shutter speed and the camera adjust the aperture to gives you the correct exposure*
In A mode, it aperture priority. You adjust the aperture and the camera adjust the shutter till you get a correct exposure*
In M mode, it full manual, you adjust both the shutter and aperture.
Sorri, i dunno abt P mode though.
*correct exposure: this so call correct exposure is wat is deem correct by the camera metering. however wat is deem correct by the camera might not always be correct. This is one of the reason why you use a EV compensation. i,e when metering against a scene of snow, your camera might actually gives you a higher reading then it should be, thus giving you a greyish instead of a pure white snow when you follow the 'correct exposure' thus we actually use a compensation of +1- +2 to compensate for the flaws of the meter.
firstmoon said:
assume if the camera changes its shutter speed to effect the compensation and the camera is already set to the highest speed, does it mean putting -1 compensation have no effect?
can somebody pls enlighten me? try to find answer in many book, but there is no satisfying answer.
thank q.
by setting a compenation of -1 would actually require you to use a higher shutter speed which your camera already cannot support.
if your qns is the oppz, in the case of putting your compensation to + , true, it will let you take w a slower shutter speed, and if this falls within your camera supported shutter speed, you can take the shot. but wat will happen?
unless you know wat you are doing, by using using a + compensation you are actually overexposing your shot, and rendering the subject you meter to become overexpose. In general this should not be the way to do when your camera hit the highest shutter speed.
in general, i would personal feel tat seldom would you hit the highest shutter speed, unless you using a very high speed film in daylight, or shooting with 1.4, or shooting at the sun.
if you do have the prob of hitting the highest shutter speed often, this are something you can do:
1. use a higher F value
2. use a lower iso film, or digital cam you can set.
3. fix on a ND filter when you need it.
hope it helps.
cheers=p