Origin of (1/Focal Length) guideline?


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ST1100

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Jun 18, 2003
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#1
Does anyone know where this rule of thumb originated?

Specifically, what assumptions have been made about the limits of handholding, image sharpness requirements, etc. i tried looking around the internet; everyone quotes the rule, but nobody seems to discuss it in depth. Any links will be much appreciated. TIA.
 

clive

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Oct 9, 2002
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#2
i guess long ago some guy made detailed records of exposure settings for many different pictures he took ...and somehow noticed the correlation between focal length and shutter speed :think: thats how science progressed throughout the ages :bsmilie:

anyway the limits of hanholdability varies with individual..but can always be trained to be improves. below r some guidelines(slowest possible hand holding shutter speed limits) for fullframe 35mm slr:

20mm:1/4s
28mm: 1/8s
50mm: 1/20s
100mm:1/45s
200mm:1/90s
400mm:1/125s

cheerz
 

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