From: Emery Greg 
To: John Sherman 
Cc: atm{at}shore.net
Reply-To: Emery Greg 






> Now imagine two f/2.8 lenses, one has a 50mm focal length and the
> other has
> a 100mm focal length. Now, you want to make an image of a person
> on a piece
> of film, say. If you use the 100mm lens the person will be twice
> as tall as
> if you used the 50mm lens. Of course the aperture is the same, and

If both lenses are f/2.8, won't the 100 mm lens have twice the aperture of the 50 mm?

The 100 mm lens has a larger image and 4 times the light collection.

ttfn
greg

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