Quote:
Originally Posted by smokes
Confused by the lens speed statement? If all lens use light they would all work at the same speed.
I am engineer by trade so i get confused with a lot of marketing speil.
|
It's not so much Marketing speil - A lens which allows more light to pass through (for a given time interval) is concidered 'faster' because it will allow a faster shutter speed to be used.
However 'faster' lenses tend to be bigger, heavier and more expensive
Another factor is the maximum ISO rating of the camera - the ISO is effectively the 'gain' of the sensor - ampifying the data from the pixels. So High ISO value can allow a picture to be recorded using less light (i.e. faster shutter speed) at the expense of more noise (some cameras have a better noise charastic than others)