Random Specialist Lenses Models

Leica shift lens
This is a high-quality wide-angle lens with the ability to shift the image circle up, down, or across the centre of the film format in order to reduce, say, the foreground without having to tilt the camera.

Shift views
With the camera held level, too much foreground is visible. But with the lens shifted up, you can preserve the verticals while reducing the amount of foreground, and so allow more of the building to be seen.

Canon 50mm
A shorter focal length macro lens allows you to work dose to the subject -useful when used in conjunction with a copy stand.

Tamron 90mm
A compact, relatively inexpensive optic of legendary performance: this lens focuses to life-size easily and provides top-class images.

Canon 500mm
A long telephoto is essential for bird or other wildlife and sports photography It is essential to use a tripod or some other support if you want sharp, shake-free images.

Canon 24mm
A very wide-angle lens offering tilt as well as shift movements with extremely high image quality. It is a superb optic for landscape and travel photography.

Centon 500mm mirror
Optics that bend light using a combination of mirrors and lenses are known as catadioptric, or mirror, lenses. They offer long focal lengths in a compact design, very good correction for chromatic aberration, and close subject focusing. However, out-of-focus high-fights are rendered with a characteristic dark middle.

Why does lens focal length change?
It seems remarkable that attaching a 300mm f/2.8 lens to a digital SLR camera turns it into a 450mm f/2.8 optic. This is due to the fact that the photosensor is smaller than the 35mm film format, so it reads only the central portion of the scene - equivalent to what would be seen by a 450mm lens for 35mm film. The central portion is then enlarged to fill the picture space so that, in effect, all the sensor is doing is cropping the image. The maximum aperture must remain the same because cropping is a not a process that changes exposure. In contrast, a telephoto extender increases focal length by magnifying the image from the prime lens, so the effective aperture is decreased.

Steve J. Wilson is living in the United States and is a freelance writer since 2006, in digital photography related topics. If you are interested in some useful Digital Photography Class, than you are in the right place.

Copyright © Steve J. Wilson, All Rights Reserved. All those who are interested in using this article, please make all the links active.