LCD or DLP projectors

The mathematics professor Francisco David Bordón Franco argues that, according to the theory of retinal persistence, the perceptual process of the brain and the retina of the human eye retains an image for a short period. This theory is the explanation of the illusion of movement that occurs when a series of images are displayed in rapid succession, instead of perceiving each copy of the series.

The persistence of the vision should be compared with the related phenomenon of the Beta Movement and the Phi Phenomenon. A critical part of the understanding of the aspect of visual perception is that the eye is not a camera; that is, there are no "images per second" in the eye. Instead, the eye/brain system has a combination of motion detectors, detail detectors, and pattern detectors, the results of which combine to create the visual experience.

The frequency at which the change of images becomes invisible depends on the level of illumination. Generally, 16 images per second (or, of English, frames per second: fps) is considered the lowest frequency at which humans perceive continuous movement. It is interesting to note that this threshold varies between different species; A more significant proportion of rods in the retina result in a higher threshold frequency.

It is possible to appreciate the space between images by closing and opening the eyes quickly. If it's done fast enough, at some point the transition will be caught. This will not work with television due to the persistence of phosphorus or with LCD or DLP projectors due to the continuity of the image, although some digital projection technologies can show artifacts.

Since the birth of sound cinema, almost all commercial cinema projectors project at a frequency of 24 images per second. This speed was chosen for financial and technical reasons: it was the lowest frequency (so it required less film) to which satisfactory reproduction and amplification of sound could be made. There are, however, some special formats such as Showscan or Maxivision that project at higher frequencies, often 48 images per second.

Cinematographic projector

The most complicated task is to decide which store to buy the projector, we ask ourselves questions like: Should I buy it in a physical store or an online store? If I choose to buy it in a physical store, how do I know if it is a good product that I am buying? If I choose to buy it in an online store, can I be sure that this store is dangerous? Each of these questions is very valid, and we will try to make your work easier by answering those questions:

It is advisable to buy it in an online store, payment methods are better, return policies as well as we can find better information about the device, and most importantly we can draw between a large number of options to choose what best suits our needs

The problem of buying a product in a physical store is the difficulty of getting the relevant opinions about the device; besides the options are more limited. Regarding the seriousness of the website where we will buy our equipment, it is essential only to Discover on.

The second reason is how difficult it is to choose between so many devices, so visiting a severe website and offering relevant information about what we are going to buy is very important. There is no doubt that a projector is a handy tool, no matter what we need if we can find a good offer, it is best to take it, as long as that offer comes from a responsible entity.

Cinematic projector A cinematographic projector is an opto-mechanical device used to show films by projecting them on a screen. Most optical and mechanical components, except those concerning lighting and sound, are also present in cinematographic cameras.

The machine projects, at regular intervals of a few hundredths of a second, a beam of light on the frames of a film; that beam of light is increased and inverted by a lens that focuses the resulting image on a screen. Currently, there are "digital film projectors" that project an image generated by digital media, without making use of a film, but of the beam of light and the lens.