Exercise 7 - Focal length

"Pretty much every compact digital camera on the market has a zoom lens, and of course there is a wide range of zoom lenses available for all digital SLRs, as well as a variety of non-zoom lenses with different focal lengths. A zoom lens is one that has a variable focal length.

The focal length of a lens is an expression of its magnification power, and is usually stated in millimetres. If you look on the front of your camera, usually inscribed around the front of the lens you'll find the focal length range."  (Explanation of focal length from -http://www.trustedreviews.com/opinions/digital-photography-tutorial-focal-length

I have a Nikon D5000 and used a DX VR 18-105 mm f3.5-5.6 zoom lense to obtain the following pictures to illustrate the different focal lengths.  As you look through the pictures you can see how using a longer focal length reduces the width of the picture and condenses the image.

First image with focal length at 18mm, f11 @ 1/1000 sec

First image with focal length at 18mm

Second image with focal length at 24mm, f11 @ 1/1000 sec

Image with focal length at 24mm

Third image with focal length at 35mm, f11 @ 1/1250 sec

Image with focal length at 35mm

Fourth image with focal length at 50mm, f11 @ 1/1250 sec

Image with focal length at 50mm

Fifth image with focal length at 75mm, f11 @ 1/1250 sec

Image with focal length at 75mm

Fifth image with focal length at 75mm, f22 @ 1/400 sec

Image with focal length at 105mm