| Leica shift lens | | | | is a superb optic for landscape and travel |
| This is a high-quality wide-angle lens with the ability | | | | photography. |
| to shift the image circle up, down, or across the | | | | Centon 500mm mirror |
| centre of the film format in order to reduce, say, | | | | Optics that bend light using a combination of |
| the foreground without having to tilt the camera. | | | | mirrors and lenses are known as catadioptric, or |
| Shift views | | | | mirror, lenses. They offer long focal lengths in a |
| With the camera held level, too much foreground | | | | compact design, very good correction for |
| is visible. But with the lens shifted up, you can | | | | chromatic aberration, and close subject focusing. |
| preserve the verticals while reducing the amount | | | | However, out-of-focus high-fights are rendered |
| of foreground, and so allow more of the building | | | | with a characteristic dark middle. |
| to be seen. | | | | Why does lens focal length change? |
| Canon 50mm | | | | It seems remarkable that attaching a 300mm f |
| A shorter focal length macro lens allows you to | | | | 2.8 lens to a digital SLR camera turns it into a |
| work dose to the subject -useful when used in | | | | 450mm f/2.8 optic. This is due to the fact that |
| conjunction with a copy stand. | | | | the photosensor is smaller than the 35mm film |
| Tamron 90mm | | | | format, so it reads only the central portion of the |
| A compact, relatively inexpensive optic of | | | | scene - equivalent to what would be seen by a |
| legendary performance: this lens focuses to | | | | 450mm lens for 35mm film. The central portion is |
| life-size easily and provides top-class images. | | | | then enlarged to fill the picture space so that, in |
| Canon 500mm | | | | effect, all the sensor is doing is cropping the |
| A long telephoto is essential for bird or other | | | | image. The maximum aperture must remain the |
| wildlife and sports photography It is essential to | | | | same because cropping is a not a process that |
| use a tripod or some other support if you want | | | | changes exposure. In contrast, a telephoto |
| sharp, shake-free images. | | | | extender increases focal length by magnifying the |
| Canon 24mm | | | | image from the prime lens, so the effective |
| A very wide-angle lens offering tilt as well as shift | | | | aperture is decreased. |
| movements with extremely high image quality. It | | | | |