Actually the 3rd element is a negative meniscus, the 4th is a double concave. I spent too little time studying the diagrams earlier.
regards, Anthony Farr ----- Original Message ----- From: "Anthony Farr" <[EMAIL PROTECTED]> > ... I had a look at the FA50/1.4 diagram > <http://kmp.bdimitrov.de/lenses/primes/_optics/50f1.4-iii.jpg> on Boz's site > <http://kmp.bdimitrov.de/> and notice that the 3rd and 4th element from the > front were strongly concave menisci (meniscuses?). ... >
