Originally posted by enoeske If you camera has a tendency to underexpose, you can use EV comp to tell the camera to constantly overexpose so that the image comes out how you like it (or the other way around for overexposing). I find the K-3 to be pretty spot on, especially compared to my old K-20d that needed +0.7 comp.
I also use it whenever I know I'm shooting a mostly dark or mostly light scene and I know the scene will trick up the metering. If I'm shooting dark, then I use -1.3 ev or the other way around for a light scene like snow.
I have not experienced the exposure problem, I have read in one the the reviews of the camera that it tends lean in the direction of more exposure. I just put that observation out there to see if anyone had a similar experience. Thanks for your input.
---------- Post added 11-20-15 at 07:34 AM ----------
Originally posted by marcusBMG Thanks for the suggested readings; I will take a look at them this weekend and experiment with what is suggested. Thanks for your input.
---------- Post added 11-20-15 at 07:37 AM ----------
Originally posted by stevebrot The short answer is that you use EV when the automated meter system does not provide the exposure that suits how your visualize your subject. How to do this is in the user manual. The specifics vary between camera models. Your other option is to shoot in Manual mode and nudge aperture and/or shutter speed to suit.
Common use cases include:
- Strong backlighting
- Deep shadows of critical importance
- Blown detail in clouds
- Blown detail in pure bright colors due to channel clipping
- Edit: Forgot to include snow and bright sand to the list. Both will usually meter 1-2 stops less light than is appropriate.*
FWIW...Exposure comp is a by-product of exposure automation. In the years before the camera was choosing settings for you, compensation was applied the old-fashioned way...when you set the aperture and shutter speed.
Steve
* As noted in other comments on this thread, when and why to use EC is all bound up with exposure theory and how the metering systems work. A good book or set of tutorials on exposure are very helpful. I favor the tutorials on the Cambridge in Color Web site (
Learn Photography Concepts). Brian Peterson's book is sort of the standard text (
http://www.amazon.com/Understanding-Exposure-3rd-Edition-Photographs/dp/0817439390). I learned the nitty-gritty from Ansel Adams, "The Negative". His approach is more technical, but the principles can be broadly applied. Your public library should either have or be able to get a copy.
Steve thanks for the feedback and suggested references. I will check out the reference material you suggested this weekend.
---------- Post added 11-20-15 at 07:41 AM ----------
Originally posted by mattb123 A slightly simplified explanation to get the concept (different metering modes might change this somewhat):
The meter in any camera want to tell the camera to expose so that the image averages to the equivalence of middle-gray.
If the scene you are shooting isn't a typical daylight scene, that level of brightness might not give you the exposure you like.
The most common scenario I come across is shooting on snow. Because it is so bright, I don't want the camera to expose my photo to be mid-gray because snow is not gray, it is white.
So I'll dial up the compensation (+/-) to overexpose by .5 to 1.5 stops to make the snow white.
Or if I'm shooting in low light and want the photo to look like it was shot in low light, I'd dial down the compensation so the photo looks like a night shot. This can also help keep the shutter fast enough to shoot handheld while not using compensation would need a slower one.
Finally, if you have a scene that is mostly mid-toned like a forest or mountain scene with bright clouds in the sky, the meter might set your exposure correctly for the forest but the clouds will overexpose, losing detail to the blown out part of the shot. This is often called a hot spot. To get around this, you could dial the compensation down, underexposing the forest and getting a good cloud exposure. Then when processing the shot you can raise the shadows to bring back out the forest detail.
Matt, thanks for the input; that is an interesting point on shooting snow or very bright environments to not have a wasted out appearance and be more natural.
---------- Post added 11-20-15 at 07:46 AM ----------
Originally posted by MJSfoto1956 you can also use it to "bias" your bracketing. For example if you dial in -1 EV compensation and shoot a bracket of five with +2, +1, 0, -1, -2 bracketing, you'll end up with +1, 0, -1, -2, -3 exposures. This would give you very nice sunset detail (for example) and still give you pretty decent shadow detail.
Michael
MJ, I haven't done much with bracketing although is sound like it would really enhance a shot; I will make a point of experimenting with this to come up with varied and more interesting photos.
---------- Post added 11-20-15 at 07:49 AM ----------
Originally posted by derekkite I use it regularly. I start with center weighted exposure, then adjust up or down. I shoot wildlife mostly, and set a -ev for white highlights, for example -1.3 for osprey in the morning sun. I'll adjust +.7 or +1 for birds against a cloudy sky, +.3 against blue sky. The fall light typically needs -.3 to not blow highlights.
Derek, thanks for your feedback and the specifics where you utililze the EV compensation; I will keep your suggestions in minds when shooting under similar conditions.
---------- Post added 11-20-15 at 07:51 AM ----------
Originally posted by mikeSF when i do night city skyline shooting, if there is a particularly bright part of a building or strongly lit section that i do not want to blow out, i will dial in some underexposure, such as -1 to -2ev just to keep those under control.
I also use it as mentioned by Michael above as a bias for a 5-exposure bracket when the sun is in the frame if i want to retain reasonable highlight control of the sun in the darkest bracketed frame.
Mike, thanks for your suggestions; I took a look at some of your photos and you have really captured some great pictures of the San Francisco area.