Cheat sheet for lens focal length vs shutter speed
Nov 2, 2017 07:54:15 #
imagemeister wrote:
Another consideration is subject distance ( magnification). IMO, the 1/FL shutter rule only applies to subjects at least 20X the focal length of the lens away or greater !
Every movement or shake is exaggerated as the subject is farther away. If you are shooting a portrait of someone ten feet away a small movement could move the focus point from one part of the eye to a slightly different part of the eye. If you are shooting a bird sitting in tree 100 feet away, that same movement is the difference between focusing on the eye and focusing on a branch in the tree behind the tree the bird is actually in or having the bird drift in the frame that much during a too long shutter.Nov 2, 2017 08:45:05 #
On Canon 1D, 5D and 7D model cameras introduced since 2009 IIRC there is a Spot AF selection which is similar to single point focus but is even tighter and smaller in size than Single Point AF. If someone is using one of these model cameras they can look into using this to control their focus point better in challenging focusing situations.
Best,
Todd Ferguson
Best,
Todd Ferguson
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