Pinhole, where truth, beauty and goodness...

Pinhole is a photographic technique that employs most of the times a home made camera in different degrees of improvisation and roughness. Matchboxes, shoeboxes and whatever boxes and containers are sort of starting point for those projects. The photographer bricoleur may also start from scratch by...

Front raise and horizon line

For a given lens and given film or sensor format, this simulator shows how much it is possible a front raise and where the horizon line will end up in the final picture. Focusing is assumed to be at, or closer to infinity, a normal landscape condition. Observations: 1 – The scheme is...

Refraction, Dispersion and Optical Glass for...

Refraction Refraction is a phenomenon of waves changing direction when passing from one medium to another. In a photographic lens that is the case when passing from air to glass and again from glass to air. It occurs also when passing from one type of glass to a different one. They are not all the...

Lens/subject/format – an online...

How it works: You enter the focal length of your lens, film or digital sensor dimensions and the approximate size of your subject. The simulator shows in value and graphically the following corresponding information: the distance you must place your lens from the subject the image circle and angle...

Ground glass loupe, easy and useful

Quite often we want to check focus more carefully in a view camera . To do that, the obvious idea, goes about using something that enlarges the projected image allowing for more precision than with bare eyes to inspect image’s sharpness. Three problems generally arise when using common loupes...

Immateriality of digital image

It is a fact that the digital image has a state in which it is pure information. That is the case when it is written as a file, as sequence of bits. But once printed in paper, it is no less physical or material than the traditional analog photography. Similarities are not only in this final output...

Focal length and image circle

(image source: wikimedia commmons) You certainly saw already a diagram more or less like this one. It is a standard way to explain what focal length is. This is how camera makers talk about focal length and they have a good reason for that: they want you to learn what focal length means in the...

Popular portrait, at peace with fantasy

It allows plenty of good insights the exhibition, Retrato Popular, do vernáculo ao espetáculo, (Popular Portrait, from vernacular to spectacle) on show at SESC Belenzinho – São Paulo, since May 6 and ending July 31, 2016. First by providing an encounter of popular art, that is made for...

Measuring lens aperture

  Only at the beginning of the 20th century that all the important makers consistently started to engrave or print the maximum aperture and focal length on their photographic lenses. But the fact is that there are still many interesting vintage glasses from the 19th century that can be used...