Saturday, October 10, 2009

A Different Perspective

A recent conversation with a colleague over focal length and wide angle lenses inspired today's posting.  I happened to find two images in my fall collection which illustrated some of these concepts.

    A 'normal lens' is one that is said to approximate normal vision. For a full frame camera, that is best approximated by a 50mm lens with a small aperture for a large depth of field, but that is just an approximation. This first image was taken at 54mm with a crop-frame camera which works out to about 83mm (full frame equivalent - 54*1.6). So a little more 'zoomed in', that is tighter than what the eye might have perceived. 


    1/80 f/8 ISO 100 18.0-55.0 mm @ 54 mm Canon EOS DIGITAL REBEL

    This second image was taken at 18mm. It intentionally includes a lot more sky - the clouds at a lot more drama. It also included a lot more ground, but I though that to be boring so cropped it out. You can see the same stand of trees in the middle of the frame.
     
    1/125 f/8 ISO 100 18.0-55.0 mm @ 18 mm Canon EOS DIGITAL REBEL


    If you would like to learn a little more about the effects of different focal lengths, Canon has an excellent tutorial - it doesn't matter what brand of camera you use, the ideas are the same. The numbers may vary based on your sensor size, but that is a topic for another day.

    Two more things:
    1. Bonus points for anybody who can identify where these images (above) were taken, and
    2. It is a beautiful weekend in the GTA - get out there and take some pictures.
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