Quote Originally Posted by hoojammyflip View Post
Hi, I have been surfing the web all the morning (waiting for a bed to be delivered) regarding the OM 50mm 1.8 lenses. It appears that the most recent lens is in fact similar in layout to an enlarger lens, with 6 elements in 4 groups:
http://www.star.ucl.ac.uk/~rwesson/e.../50mm_f1.8.pdf

Can anyone say whether this is also the case for the "Japan" version?

Do I need to get an older one (F-Zuiko) in order to have the lens design similar to the 1.4 and Pentax M 1.7 50 which I am used to, as shown in the front page of the same UCL site, where the front group doesnt have the doublet?
http://www.star.ucl.ac.uk/~rwesson/e...up/50mmf18.htm

Thanks.
Why are you worried about the design of the lenses? Most all fast normals for 35mm are a variation on the Double Gauss formula, with various tweekings to add the requisite degree of retrofocus. They all, once you get above a certain level of performance, behave similarly.