Greetings ; If we take 50 mm as being the 'Standard lens for 35mm ' then 100mm is double that length: If we take 150mm as being the Standard lens for 4"x5"' then 300mm is double that length: I believe we should compare 'Focal lengths' NOT Film area. Cheers Barrie B. At 10:48 AM 30/10/2004, you wrote: >At 04:36 PM 10/29/2004, Gene Johnson wrote: > > > >1600mm? You sure about that Jim? I was thinking more like 400. He used a > >100mm on his 35mm camera > > >The 4x5 frame is roughly 16x the 35mm frame. This is all about image >magnification. 16x 100 = 1600. > >But I could be wrong and would gladly accept another proof. > >Jim > >============================================================================================================= >To unsubscribe from this list, go to www.freelists.org and logon to your >account (the same e-mail address and password you set-up when you >subscribed,) and unsubscribe from there. ------------------------------------------------------------------------------------------------------- barrieb@xxxxxxxxxxxxxxxxxxxx{ Melbourne , Australia } ============================================================================================================= To unsubscribe from this list, go to www.freelists.org and logon to your account (the same e-mail address and password you set-up when you subscribed,) and unsubscribe from there.