 Rom A.G. |
exposure compensation how often do you use it in comparison to changing ISO, aperture, or shutter speed? if shooting in low light, you decrease the SS and/or increase the ISO(800+); action shots you increase SS and/or ISO. so why bother with exp.comp? if you do fiddle with it, the ISO and SS change, thus you lose control. I've noticed if even using -5 in bright sun, the photos are dark; +5 overexposed. Thus, exp.comp _might_ be useful on P&S cameras with no manual aperture or shutter priority. It is _very_ useful if using a P&S shooting macro up close using flash, if set to -2, prevents over-exposure.
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Bret Tate |
Exposure compensation is helpful in situations that fool the in camera meter. For example, if you were shooting in snow scenes all day you could shoot aperture priority and dial in +1 to 2 stops compensation to get the proper exposure and forget about it. Or, you could meter everything manually and do the math to change the camera sewttings by +1 to 2 stops for each shot which would take more time.
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Michael H. Cothran |
There is absolutely no difference between changing your ISO and using your exposure compensation dial. Use whichever is more convenient for you. Michael H. Cothran
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Pete H |
"There is absolutely no difference between changing your ISO and using your exposure compensation dial. Use whichever is more convenient for you." Guess this makes no sense to me, or I am mis-reading you? Exp comp does NOT change ISO. If shooting Aperture priority, and you dial in a comp, the speed will change. Increasing or decresing ISO does nothing to affect a balanced exposure.
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Laura Kubasiewicz |
Yeah im with Pete and Bret on this one, Anyway just wondered if anyone knows how ISO works in a digital camera? I understand it in film I think, Also do you get a lower resoultion photo at higher ISO? Argh confused.... p.s if it involves maths feel free to say 'its technical stuff' and ill get the point!
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Stan Lubach |
I use exposure comp. a lot when shooting in low light. The meter tends to want to make the scene look like daylight in some cases, so I usually set the comp -2/3 to make sure the lighting stays natural. Laura, I'm not totally sure about this, but I think in digital cameras, where the signal is amplified electronically, the ISO setting determines how much amplification to use. The problem is that noise in the signal also gets amplified, which shows up as grain.
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Pete H |
Yep..That's about it..More "bias" is placed on the sensor sights equally..the increased current equates to a rise in temperture..so it is "thermal noise" we see when ISO is raised. A CMOS sensor is a little more prone to this noise compared to a CCD, though not really visible to the eye. In time, this noise will be greatly reduced in RGB sensors for DSLR's..right now it is not economically feasable..although they do exist as the current crop of Astro-photographic-imagers proves well..and we are talking secs to 30 mins on some of these exposures.
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