----- Original Message ----- From: "Kostas Kavoussanakis" <[EMAIL PROTECTED]>
> On Mon, 16 May 2005, Jostein wrote: > > > an adapter with two cokin rings and epoxy glue, and tried the FA > > 50/1.4 reversed in front of the A*200/4 macro. > > <snip> > > > Optically it seems like a good solution for 4X macro in the field. > > Can you point me to a reference for the calculation of the > magnification? John Shaw's "Closeups in Nature" Magnification = focal length of prime lens / focal length of reversed lens ex: 200mm (prime lens) / 50mm (reversed lens) = 4 HTH Christian
