> Where does the aperture come into play in this? It doesn't, needs to be used wide open.
John ---------- Original Message ----------- From: Kostas Kavoussanakis <[EMAIL PROTECTED]> To: John Whittingham <[email protected]> Sent: Mon, 7 Mar 2005 16:00:48 +0000 (GMT) Subject: Re: M 4/200mm vs F 4-5.6/70-210mm at 200mm > On Mon, 7 Mar 2005, Frantisek wrote: > > > JW> Thanks for the info, I can't see me using an f/1.4 though - little > > JW> expensive :) Any idea of the magnification using the full lens? > > > > IIRC the formula is > > > > M = 250 / f > > > > where M is magnification and f is focal length. Thus a 50mm lens would > > be a 5x loupe. > > Where does the aperture come into play in this? > > K ------- End of Original Message -------
