Archived posting to the Leica Users Group, 1999/09/05
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]In a message dated 9/5/99 7:05:01 AM Eastern Daylight Time, doug@meditor.demon.co.uk writes: << I'm always surprised by the difference in size between my 20mm f5.6 Russar and my 21mm f4 Super Angulon-R. The inner groups of the Russian lens must be very small. Perhaps Leitz thought in neccessary to move to retrofocus in order to get the speed of 28mm lenses to f2.8. >> I thought the retrofocus design was necessitated in order to allow the SLR's mirror to clear the rear element and permit reflex viewing. The 1st version of the 21 S/A R lens (for the original Leicaflex) required the mirror to be locked up and the M-type viewfinder used in the accessory shoe.