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For all lenses, the smallest aperture number—1.4, 2, 2.8, or 4, depending on the lens—reflects the widest opening and will always admit the greatest amount of light. Whenever you set a lens at its smallest numbered aperture (or f-st

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source Distance to subject (chosen by photographer) has an effect on perspective and on depth of field (depth of focal sharpness proximal and distal to the focal plane) for a given aperture.

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The f-stop, which is also known as the f-number, is the ratio of the lens focal length to the diameter of the entrance pupil. *** An f/1.0 lens has a very large aperture diameter , equal to its focal length, an f/2.0 lens has an

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source excerpt: In photography parlance, f/stop always means the aperture or lens opening. However, for lack of a current commonly used word for one exposure increment, the term stop is often used. In the past, EV (Exposure Value) s

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extensive glossary / explanation of photographic terms

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* -> TO INDEX PAGE 1 <- *

* -> TO INDEX PAGE 2 <- *

* -> TO INDEX PAGE 3 <- *

* -> TO INDEX PAGE 4 <- *

* -> TO INDEX PAGE 5 <- *

* visitor's guide *

Below each index page image is a single word which gives a hint to the subject on that webpage.

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Clicking on any index page image opens a webpage, which most often contains an illustrated 1,000 word essay and an image collection. External links are provided to offer in-depth discussion of the subject.

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*** The layout and organization of imagessays.com is a bit tangential by design, leading the visitor to an exploration of related subjects, informing in an unexpected manner, and so expanding the knowledge base of the viewer. ***

primary webpage: seeing

secondary webpage: marrow

annotated list of webpages: * annotated *

“Whenever I discovered something which was noteworthy,

I have felt it my duty to put down what I had discovered,

in order that it would become known to the educated world.”

Antonie van Leeuwenhoek

Letter of June 12, 1716

… see: microscope

“Sharing knowledge is the the greatest of all callings.

There is nothing like it in the land".”

The Instruction of Dua-Khety

… to his son, as he entered scribe school c. 2000 BC, Egypt - Middle Kingdom

… see: seeing

navigation

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explanation of website design

* annotated index of selected webpages *

list of essays

list of external links