This is one reason I went auto focus with my 35mm gear. But on occassion I miss the focus on the subject with both my Pentax 645 and 6x7. How many people deal with this issue on their medium format cameras? The screen is bigger then 35mm, so by rights I should be able to get the focus more accurate. But I still miss it at times. Many of these times were on overcast or shaded days. I changed the screen in my 645 to a Beattie, but I still ended up getting a few bad shots. What are people doing to get accurate focus on their cameras? For portraits depth of field is small to get the background out of focus, or for the lack of light with slow film. All I know is a couple good shots ended up being passed over for enlargements due to missing focus. To add the focus is correct on my cameras in terms of the screens themselves, so its not an equipment issue.