Saturday, June 27, 2009

Lighthouse on Grand Island

This is the East Channel lighthouse on Grand Island, Lake Superior. Since this picture was taken in 2004, restoration efforts have repaired the siding and rebuilt the Lantern Room.

The image was taken from a moving boat, the normal rule of thumb for handheld is that your shutter speed should be faster than one-over-focal-length. In this case my focal length is 75mm, so my shutter speed should be faster than 1/75th. But that is just to compensate for hand-held shake. Image stabilization would allow for slower shutter speeds. Since I was on a moving boat, the shutter speed has to be much faster to compensate for the rock and roll of the boat as well as its forward movement. 1/320th was fast enough in this case.

1/320 f/4 ISO 100 @ 75 mm Canon EOS DIGITAL REBEL


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