Size and weight might be important to you. Both 240mm Sironars are in Copal 3 shutters. The Sironar-N is alleged to weigh 780 grams and uses 77mm filters, while the Sironar-S is 980 grams and takes 86mm filters. The S is still available new, the N is not.
Both the Fujinon and Germinar-W fit Copal 1 shutters. The 250mm f/6.7 Fujinon (don't confuse it with the newer f/6.3, which has less coverage) weighs 617 grams and takes 67mm filters. The 240/9 Germinar-W weighs 380 grams and takes 49mm filters.
The weights of the Sironars are taken from Rodenstock specs I found here:
The weights of the Fujinon and Germinar are actuals I've measured.
Last edited by Steve Goldstein; 04-20-2009 at 10:31 AM. Click to view previous post history.
Reason: Corrected weight of 250 Fujinon