Sunday, 8 April 2012

Focal lengths - for cameras with variable focal lengths (with a zoom or interchangeable lenses)

The instructions for this exercise required a view that is open but with some details in the distance, in the middle of the view.  The scene (Seatoller House in the Borrowdale Valley in Cumbria - in the rain!) was shot with different lenses at their minimum and maximum lengths with results as follows:


18-55mm (kit lens) shot at 18mm and 55mm


18mm

55mm


55-200mm (telephoto lens) shot at 55mm and 200mm

55mm

200mm





10-24mm (wide angle zoom) shot at 10mm and 24mm
(note these images are darker due to the permanent fixture of a polariser for landscape photography - I like the effect it has on the clouds)

10mm

24mm


Finally, although the exercise did not require it, I also shot the scene with a fisheye lens at a fixed focal length of 10.5mm; with this image you can see how the lens enhances the curve of the edge of the field, places the house further into the background and includes more peripheral detail that the other three lenses cannot.  You also get a full view of Dale Head, the fell in the background.

10.5mm

Although the angle of view closes in as the focal length increases, under the magnifier the detail on the wide-angle shots is the same as with the telephoto shots.  In the wide-angle shots you can see the individual plants on Dale Head in the background.



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