Then you need those special blue lines. Basically they make focussing quicker (the LF world's equivalent of autofocus) when you want to focus on a subject and have both fore and background in sharp focus. Say you are photographing a landscape with heather in the foreground and mountains in the background. The speedy easy way would be to focus first on the mountain, which being upsidedown on your screen will appear at the bottom. You use the focussing rail to get the image at the bottom line in sharp focus, using your lupe, then lock the focussing rail knobs (on your left hand side). Next you loosen the outer locks securing the back board and tilt the back until the image on the upper blue lines is sharp, then secure the outer locks. Usually only a couple of mm are needed. Your image will then be sharp across the whole plane. The feature is really useful if you have a limited time to focus, as I often do because of severe back pain! If you're normal, don't worry too much..... It is also very easy to use. Bear in mind that you are paying a premium for assymetric focussing.Darwinean_John wrote:SV45U2
PS: Some of us heretically disagree with Joanna on the benefits of the assymetric rear tilts.

PPS: I've just donned my special teflon helmet...
PPPS: ...and am now secure in my Joanna-proof* bunker!

*patent pending