[Leica] Ring strobes - AND ASPH

["Harry Bass" <hwbass@hbrf.org>]

Folks:

I desire to do macro photography of coins. Needed are 1:1, 2:1, and 3:1 capabilities,
as well as the ranges 1:2, 1:3, etc., using Leicaflex, Leicaflex SL, and Leicaflex SL2  
with Bellows-R and supplementary close-up lenses.

Considering the very close object to lens front distances that will be encountered, 
are there strobe ring lights available for such an application, and what are they
(make/source)?

ANOTHER QUERY:
What is meant by ASPH lenses and of what benefits do they have with the none
ASPH lenses?

TIA,



Harry Bass
HWBass@HBRF.ORG
!!!!