Re: [Leica] Focus Mark for Infrared Film.

["Tom Schofield" <tdschofield@email.msn.com>]

Or upgrade to a 90 APO or 100 APO and don't worry about the correction.

Tom

> >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).

> 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