I am very new to photography and am trying to grasp the basics of it these days. Can someone please help me understand the relationship between focal length of a lens and shutter speed of camera?
Answer
There is no direct relation between the two. However, there is an observation that with longer focal length you need faster shutter (keeping ISO the same) in order to avoid blur from camera shake. Quoting:
The rule of thumb for a sharp picture, free from the effects of camera shake, is to use a shutter speed which is at least as fast as 1 divided by the focal length of the lens. So if you are using your zoom set at 100mm you should use a shutter speed of at least 1/100 of a second. If you are using a 50mm lens you will get a sharp picture at 1/50th of a second.
Now this rule is modified by VR (vibration reduction), and similar solutions, so you gain a few stops so your shutter speed can be decreased by that.
This rule does not apply if the camera is on a tripod, or you have a steady hand, etc.
It also does not help removing blur from people moving, etc.
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