25

I understand that, on a digital camera, "exposure compensation" actually alters signal amplification, similar but not identical to changing the sensitivity. In general, this is not how the term is used. Instead, "exposure compensation" means: tell the camera's exposure program in automatic exposure modes to target an exposure brighter or darker than the ...


21

The term "exposure" is used for a number of different but related things in photography. I can see how this might be confusing. Here are six different ways in which it is used: The combination of all factors which make a photograph have a certain overall brightness. The key factors are shutter speed, lens aperture, and sensor or film sensitivity (a.k.a. ISO)...


20

A digital sensor isn't really best described as "reading data". A much better way to describe it is "collecting photons" that are then converted into data by measuring the microscopic electrical charges they produce once the collection period is over. They do not have the capability to continuously record the changing state of each pixel well as they collect ...


13

You misunderstand how exposure compensation works. Exposure compensation is not an actual physical thing the camera uses to control light - there are only 3 real things that control the amount of light: Aperture, Shutter speed and ISO. Exposure compensation is a way to tell the camera in one of the auto/semi-auto modes you want to override the light meter ...


13

We already have some of the technology for this. Our term for remembering the sensor readings at each exposure point is "video", and what you are asking for is reconstruction of an optimal still image from multiple video frames. For an overview of Microsoft Research work on this, start here: http://research.microsoft.com/en-us/um/redmond/groups/ivm/...


13

It's not the case that "exposure compensation actually alters signal amplification". There are only 3 ways to control exposure: aperture, shutter speed and ISO. Exposure compensation is not a magical additional exposure control. It just tells the camera to change the exposure x number of stops by changing the aperture, the shutter speed or (in the case of a ...


12

In all of the semi-manual modes (aperture-priority, shutter-priority and program auto), you set one or more settings manually. The camera then chooses the rest of the parameters automatically to give you a nominally correct exposure. However, sometimes you want to override the camera's metering, either because it wouldn't correctly expose your subject or ...


12

This question tells me you should start by understanding exposure first. Start with reading about the Exposure-Triangle. If you understand that, you would not be asking this :) Briefly, exposure is determined by 3 parameters: ISO, Shutter-Speed and Aperture. When you are in manual mode and set all these, that is it. No further adjust is possible or needed. ...


12

Sports photography usually require two things: a long focal length and a wide aperture. The long lens is required to shoot action a long way away. The wide aperture is used for two purposes: Letting in enough light (it won't always be bright sunshine; weather, being indoors and daylight will affect the amount of natural light available to you) so you can ...


12

Selecting an appropriate aperture When shooting sports in low light you're not going to be able to shoot at f/11. Most of us use f/2.8 lenses and shoot wide open. We do this not only because it helps isolate our subject(s) from backgrounds that are often cluttered but also because we need the "speed" of the wide aperture to allow a fast enough shutter speed....


10

The original question is based on incorrect assumption (about digital sensor not changing state during the exposure) but the concept is related to the Quanta Image Sensor (QIS) idea researched by Eric Fossum. http://engineering.dartmouth.edu/research/advanced-image-sensors-and-camera-systems/ The QIS is a revolutionary change in the way we collect images ...


9

You are not actually adding light, you are simply enhancing what little light you gathered. With a JPEG, "stretching" or "pushing" and "attenuating" are all done in the camera, and those enhancements are baked into the JPEG file, which is then lossy compressed and stored in a low precision format (8-bpc, 0-255). With a RAW image, you are storing the ...


8

Fortunately, it's not actually voodoo magic. You have set a fixed ISO of 400, and you're in aperture priority mode, which means you're choosing the aperture and not giving the camera control of that. That means the one variable the exposure program can change is shutter speed. When you tell it you want the exposure to be two stops darker, the only thing it ...


8

Exposure is defined as the total quantity of light that hits the film or sensor during the time the shutter is open. Exposure compensation in Tv or Av modes will change the shutter speed or aperture, which in turn changes the total amount of light that hits the sensor, i.e. it changes the exposure. When shooting in manual mode the aperture and shutter ...


8

Exposure compensation is just another means of changing either shutter or aperture. I is not some fourth component of exposure, there are still only three: ISO, Shutter Speed, Aperture. If you have manually selected an aperture, changing EC will reduce shutter speed. If you have manually selected a shutter speed, changing EV will increase the size of the ...


8

It would help if you said which camera model you're currently using, since different compact cameras (even from the same era, manufacturer and price range) can have wildly different feature sets. That said, let me list a couple of options that you're fairly likely to have available. As other answers have noted, you camera may have a "snow mode" that tries ...


8

Is spot metering just an EV compensation? Metering, regardless of type, and exposure compensation are different functions with different purposes. Metering is used to obtain exposure exposure settings (ISO, aperture, shutter speed), while exposure compensation is used to modify those values. It is basically the difference between nouns and adjectives. ...


7

If you are using an automatic exposure mode (e.g. Program mode, Aperture or Shutter-priority) then dialing in +/- exposure compensation tells the metering system to adjust the exposure up or down. Otherwise it will always attempt to produce the same exposure for the same scene. If you are in Manual mode, then you accomplish the same thing by simply ...


7

There is nothing special or magical in RAW files. When it comes to exposure and balance, RAW files just store more information about colors, than JPEG files do. Either way, these colors consist of Red, Green, and Blue values and by manipulating these values you can always adjust white balance or exposure, regardless of the file type... in the ideal world. ...


7

Always trust the histogram. Unless you diligently adjust the rear LCD brightness every time the ambient lighting changes significantly, you cannot really rely on that. It does sound like you have the LCD set too bright. Check the "LCD Brightness" entry in the "Setup 2" menu.


6

Exposure compensation (for that is its name) allows you to adjust the exposure of a shot in the semi-automatic modes in situations where you think the light meter might be reporting 'incorrectly'. It essentially alters the zero-point of the light meter. Consider this situation. You are taking a shot of a man dressed in a light grey suit against a black ...


6

In the AV mode the camera decides on the settings to achieve what it computes as the best exposure possibly subject to constraint on the maximum iso and on the shutter time. This computation is made according, among other things, to the evaluation mode (that is: the camera will compute the "ideal" exposure based only on the central part of the image, or on ...


6

Briefly, exposure is a combination of factors all of which together tell you how much light accumulates on the sensor to make the picture. Shutter speed is only one aspect of exposure. The three major factors are ISO (sensor or film sensitivity), f-stop (how much light the lens lets thru), and shutter speed (how long the light has to accumulate on the ...


6

The Exposure value can be calculated with the given Aperture and shutter speed using the following formula: (src: wikipedia) where, N: Aperture value t: Shutter Speed The above EV is for ISO 100 called as EV100. EV For subsequent ISO values is calulated with help of EV100 using the following formula: where, EV100: EV from the first formula S : ...


6

The terms push and pull are still relevant in the sense that they are still used and understood by many enthusiast photographers. But they are probably not as common as they once were. New terms, such as expose to the right describe the same concept using different words. If you underexpose when taking the shot, then you push the exposure in editing to ...


6

The most obvious thing is that you chose to use f/11 for your photos. At least according to the EXIF data on this image, your lens had a maximum aperture value of f/5.1 at this focal length. By using that kind of aperture, you get two stops worth of exposure and therefore you could drop your ISO by two stops. You say in a comment that you wanted more depth ...


6

That image is bright because it is boosted electronically. You don't really want to have that image, as it's extremely noisy. It only looks (somewhat) ok on the camera's LCD because you can't really judge image quality on that tiny screen. But if you want to create an image like that, turn up ISO and aperture to maximum and select a sufficient shutter speed....


5

No and yes, mostly no though :) ADL does not affect RAW data directly. However it sometimes affects exposure, which therefore gives you a different RAW file under the same circumstance with ADL turned Off. Trying this on a Nikon Coolpix A, with ADL off, on a given scene I get 1/320s F/2.8 @ ISO 800 but as I increase a ADL from Low to Extra-High, the ...


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