Fred-- thanks for the examples. It's a standard sized adapter shoe, right? So you could use any external viewfinder in it. Including the ones with parallax adjustment built into the viewfinder. I don't think previous posters understood my point about the Canon external viewfinders with this feature. Actually, I only have the finder for 35mm, but it does have this feature.
Anyway, thanks again.
You do have a thing for the black paint cameras, huh? I agree, they're beauties.