More about Aperture
As we mentioned in the last post, if we need more light, we can enlarge the hole or keep the hole open a longer time. Enlarging the hole – also named aperture, is usually done mechanically through a set of … Continue reading
How Much Light Is Needed Inside the Camera?
The title of this post is probably deceiving (a camera needs enough light to produce an image correctly exposed), but it give us a reason to learn more about exposure, aperture, sensitivity and noise. Despite the nature of the photo … Continue reading
In Preparation for the First Step
Despite its apparent simplicity (i.e. capturing a projection of a scene on a photosensitive surface), the photography represents much more than a series of operations technical in nature. Because it is a form of art, photography requires getting familiar with … Continue reading
The View Camera
Despite all the advances in technology, virtually all cameras (from the pinhole to the modern cameras) are built around three main components: An opening that lets the rays of light coming from the scene inside; The dark chamber that prevents … Continue reading
What is a Camera After All?
The term camera comes from the camera obscura (Latin for “dark chamber”). It is not known when, for the first time, when someone saw some strange little shadows of the outer world on the walls of a dark room or, … Continue reading
Light and Colors – Part 4 (advanced)
The CIE XYZ color space [1] defines all colors in terms of three imaginary primaries X, Y, and Z based on the human visual system that possess the following properties: Based on experimental data of human color matching; X, Y, … Continue reading
Light and Colors – Part 3
Color perception is a brain process that starts in the eye’s cone receptors. These receptors are found in three varieties that exhibit sensitivity to approximately red, green, and blue colors. The separation between colors is not clean and there is … Continue reading
Light and Colors – Part 2 (advanced)
The human eye is an incredibly complex detector of electromagnetic radiation with wavelengths between 380 to 770 nm. The sensitivity of the eye to light varies with wavelength (see the CIE photometric curve for the day vision – V(λ) – … Continue reading
Light and Colors – Part 1
There are many books and papers dedicated to the study of light from different perspectives: the artist, the scientist, the designer, the historian or the biologist. There is no point in repeating here what the literature provides in abundance. The … Continue reading
The Human Factor
There is a lot of talk about what is objective and what is subjective in photography. It is true that we have plenty of objective factors, from the camera to the post-processing equipment. We can say that from the moment … Continue reading