Hey all, I recently got a sweet Sinar F and can't seem to find any info on how to use the DOF scale for the fine focusing. I went to the Sinar website but the instructions are for the new model which has an arrow you line up. I have "F" model and not the F1,+, or 2 and on the DOF scale there are two columns, one for 4x5 and 6x9. Neither of them have an arrow like the newer one to line up, only the largest aperture (f/5.6). I'm wondering when I set the first focus point do I line up to f/5.6 then do the second focus?