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10-05-2007, 05:58 AM   #16
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
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Posts: 15,400
to answer the original question,

the rule of thumb is (for full frame sensors or 35mm film) 1/focal length, based upon someone's consideration a long tiome ago of the acceptable influence of camera shake, on a small print, when you view the entire frame.

for ASP-C yes, you need to adjust this for the crop factor, and themanual is correct, multiply focal length by 1.5 for no shake reduction.

Here is the important point. You also need to adjust it the same way, for enlargements.

If you intend to blow up past (lets say 4" x 6") you would need to also adjust the same way for the enlargement factor.

If you are going to make an 11 x 17 print, since this is roughlt a 3 times blow up you may want 3 times faster shutter speed.

Obviously every one's technique and stability are a little different, and time to compose shots also can allow you to "cheat" a little, but for general walk around shots, where time to compose, relax etc is minimum, the rule is pretty good.


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