From time to time, when looking to buy a camera, friends, colleagues or relatives will ask for my advice. As much as I want to offer a straightforward recommendation, in most cases it is almost impossible. The main reason I … Continue reading
In one of my first posts – “How Much Light Is Needed Inside the Camera?” – I showed you what a good exposure is by displaying three images taken from the same point with different exposures (in fact it was … Continue reading
Before any real photographic examples of histogram use, I must add few more facts regarding images and histograms as they are used today in the digital cameras or post processing software. Colored Images and Their Representation Most of the photos … Continue reading
As a general definition, the histogram is a graphical representation of the distribution of data. “What distribution of data?” you may ask. Well, in a digital camera, like in a computer, an image is just data! I know, this may … Continue reading
Bracketing is a general technique of taking several shots of the same subject using different camera settings like exposure, sensitivity, white balance, focus or depth of field. This technique is used to accomplish one of the following objectives: When it … Continue reading
The exposure value (EV) is a number that represents a certain combination of aperture value and shutter speed (exposure time). The idea of representing these combinations as numbers belongs to a German shutter manufacturer Frederich Deckel who introduced this notation … Continue reading
Like aperture priority, shutter priority is a semi-automatic mode of exposure where the shutter speed (or exposure time) is set manually and the aperture is calculated by the camera to obtain the correct exposure for a given scene. As we … Continue reading
Aperture priority is a semi-automatic mode of exposure, where the aperture is selected manually and the exposure time is calculated by the camera in such a way that the correct amount of light reaches the sensor (see the reciprocity principle … Continue reading
Remember the simple equation that defines the exposure? The equation was introduced in the post “How Much Light Is Needed Inside the Camera?” and shows that the exposure (i.e. luminous energy) represents the product between illumination (modulated by the aperture) … Continue reading
About two weeks ago I’ve been asked “I’ve seen some photos when there is blurred like a strip above and below and the middle strip is sharp – any idea how that happens?” The question came when I posted the … Continue reading