Some time ago I was at a flea market with my wife and son. My son was a
recent college graduate with a BS in Mechanical Engineering. I bought
him a Mechanical Engineering Handbook that was dated 1941. I kidded him
that when he took it to work he would be an instant old timer. My wife
questioned the value of a 55 year old book. My son and I quickly
explained that the laws of physics don't change.
Seems like a lot of folks are not aware of that fact.
The size of the aperture is the focal length divided by the expected f
number, ie: 400/2.8 etc......
Physics says there will most likely not be a 400mm f/2.8 with a diameter
of 50mm or less.
Bob.
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--------------------oOOO-----O----OOOo-----73 de [EMAIL PROTECTED]
Curiosity killed the cat although I was a suspect for a while........
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