Archived posting to the Leica Users Group, 2000/11/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]>I know that the focus point for the use of IR film has to be changed - I >don't see any such marks of any of my Leica lenses (35, 50, 90 Summicrons). > >Is there a reason for this, what is a rule of thumb that could be used ? > >Regards, > >Peter Zak. one rule of thumb for 50mm lenses is to move the focus point to aline with the 5.6 dof indicator to the *left* of center. another trick, better with the 35 than with the other focal lengths you mention, would be too rate the film at 200, set shutter speed at 125 then stop down to 11 and let the dof take over. guy