Photography Guide written 11 years ago

Photography Guide

I’ve started a small site that tries to explain the more technical aspects of photography. A lot of the other sites/books out there tell you what means what, but not why things work in such a way. So, to appeal to the physicist inside me, it’s chock full of diagrams and articles that begin with the words “why…” and “what is…”.

Obviously I’m no expert at this, infact I don’t know very much at all. But I’m learning as I go along.

There’s not very much on the site at the minute, and I’ve not even finalised the page design. There are a few pages up, which are worth having a look through though.

You can acess the site here : Photography Guide.

Here are some Highlights from the site:

Pin-hole camera

A Pin hole camera is essentially a box with a small hole in one side, and a photosensitive surface on the other:

A pinhole camera

Here, light strikes the object and gets reflected into the small hole on the front of the camera. This then strikes the photosensitive surface (or Image Plane). The idea behind a pinhole camera is that the hole is so small that only one ray of light for each point in the scene can pass through to strike the image plane. This, in theory can produce pin-sharp images with an infinite depth of field. Read More ?.

Why is a Lens needed?

When light strikes an object, it is scattered in all directions, meaning that for one point in a scene, there are thousands of rays of light that have reflected from it. A lens makes use of this fact, and unlike a pinhole camera, where for each point in the scene only 1 ray of light is used, a lens takes many rays of light, and focusses them into one point.

A converging Lens

So the above images shows 7 rays of light being reflected from the object, then being focussed onto one point on the image plane. Read More ?.

Aperture / F-number

The aperture of a lens controls how much light can enter the camera. If a scene has lots of light, the aperture can be closed, and conversely if there is little light the aperture can be opened fully to let in as much light as possible.

Different Apertures for a lens

The image above shows three aperture states: fully closed; partially closed and Fully open. Read More ?.

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