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12/20/2004 01:51:01 PM · #1 |
Hi all
So what the heck is EV and how does it effect the photo? I've played with it on my camera and it seems to over or unerex my shots but keeping my metering "normal".
What are the technical aspects of EV and how does it affect a photo diffrently than simply over or underexing a shot through F-stop or speed?
Thanks!
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12/20/2004 01:58:22 PM · #2 |
| Exposure Varience, I think, what it does is exactly what you noticed -- adjusts from what the camera thinks the exposure should be (either lighter or darker). |
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12/20/2004 02:04:26 PM · #3 |
| That's pretty much what it does. For example, when I shoot my chimps I usually set it to be -3 or -7 depending on indoors or out and for the most part they come out correctly exposed as opposed to being over exposed at 0EV because they're quite dark. EV doesnt work with matrix metering, I believe. As for the difference between using shutter/aperture etc and EV I think, at least for me, that having a consistent EV dialed in is quicker for on-the-go shots where you cant really take the time to manually override the camera's suggested metering. |
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12/20/2004 02:06:27 PM · #4 |
EV is short for Exposure Value, basically a measure of various combinations of Aperture and Shutter Speed. When you dial in a -1 EV the camera will reduce the exposure by 1 stop, +1 Ev the eposure will be increased by 1 stop.
Check this site if you want excruciating details about that. :)
Example: f/1.0 at 1s = 0 EV, f/1.4 at 1s = 1 EV
Message edited by author 2004-12-20 14:08:55.
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12/20/2004 02:08:23 PM · #5 |
EV actually stands for "Exposure Value". Think of it as any combination of shutter, aperture and ISO that produces "correct" exposure, according to the camera's meter. For example, EV -1.0 is just the "correct" exposure minus 1 stop.
Sometimes we want to offset our exposure from what the camera thinks is the right exposure. In this case, the EV compensation is a nice, intuitive tool. Just move the compensation to the negative side to underexpose, or to the positive side to overexpose.
LOL, too slow!
Message edited by author 2004-12-20 14:08:41.
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12/20/2004 02:08:45 PM · #6 |
| EV changes your shutter and/or aperture for you. You use it in P, Av, and Tv, to make your exposure darker or lighter than the camera-selected default for that exposure. |
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12/20/2004 02:09:47 PM · #7 |
Yes, I agree with spitfire.
I belive For ShutterPriority it changes the F stop for P mode and A mode it changes the shutter speed... |
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12/20/2004 02:34:16 PM · #8 |
Just to put a slightly different perspective on this; the meter in your camera attempts to put everything it meters at middle grey (Zone5), but by altering the EV (Exposure Value) you change the tone of grey the meter attempts to match (moving left or right into different zones). For instance, when shooting a dark subject (as with Moodville's chimps) the desired zone is likely to be zone4 -- setting the EV to -1 will place the subject in its correct zone. The opposite is true of or a light subject (such as shooting a snow scene), and would be handled by placing a +1 or so for the EV.
Here is an overview of the Zone system in case the above didn't make much sense, "A simplified zone system for making good exposures" by Norman Koren -- or jump straight to the charts, "Zones", if you prefer. :D
David
/edit: proofing after the fact. :(
Message edited by author 2004-12-20 14:42:43.
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12/20/2004 02:35:01 PM · #9 |
To add to the replies, it allows you to quickly adjust things to how you think. Say you compose something and say I want this to be 1 stop over. You set EV to +1.0 and you get an image exposed 1 stop over to the camera readings. There's another thread about photographing snow, in a case like that it would be very handy.
edit: Just saw that I was a bit late on the scene :)
Message edited by author 2004-12-20 14:52:53. |
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12/20/2004 03:16:14 PM · #10 |
Thanks all!!
The links given help out a lot for even more detail! :-)
You guys are awsome!
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12/20/2004 03:53:17 PM · #11 |
my biggest gripe about EV is remembering to reset it back to default, which can be frustrating.
hence i usually manually alter the exposure, but i almost exclusively shoot in M mode anyhow...
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12/21/2004 12:44:55 AM · #12 |
Originally posted by soup:
my biggest gripe about EV is remembering to reset it back to default, which can be frustrating. ... |
I don't know about the better cameras most of you hold, but mine has a mode called 'my mode', which I keep it set at 0 EV. I can alter it for a shoot, but once I turn it off (or change modes) it goes back to the default I have defined for it. Keeps me from forgetting what state the camera is in -- it is always in a known state of my defining when it is turned on.
David
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12/21/2004 01:00:08 AM · #13 |
Originally posted by soup:
my biggest gripe about EV is remembering to reset it back to default, which can be frustrating.
hence i usually manually alter the exposure, but i almost exclusively shoot in M mode anyhow... |
I shoot almost all of my photos in M mode, it is faster to adjust the exposure that way then using the EV function, at least on my camera.
I use the live histogram as my main feedback. |
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12/21/2004 10:47:08 AM · #14 |
| In the D70 you can reset by pressing BKT and meter at the same time (labeled green). This resets any EV, quality, iso settings to normal. It keeps all your setup options the same... |
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