checking that the sharp focus of a lens matches the measured distan-ce on its barrel. If it does not, then you need to make an adjustmentof the viewing screen focus.To proceed, you must first unscrew and remove the circular cap lo-cated on behind the camera body Run/Test switch.Inside the accesshole, inser a 2mm Allen wrench and screw or unscrew it. Replacethe circular cap. Use a collimator to check that you have reached thesharpest focus of the viewing screen image. If the image is not yetsharp ennough, proceed again.2.2.10 Aatonite IlluminationThe XTRprod features illuminated viewing screen markings referredto as Aatonite. The level of illumination is adjustable by the user viathe Jog wheel, which is located to the right of the motor. To operateAatonite, power the body and switch the run/test switch to test posi-tion and off again to turn on the camera electronics. Look throughthe viewfinder and rotate the jog to set the desired level of illumina-tion. The markings will remain illuminated for a full 2 minutes afterthe camera is set in the off position. The illumination level set intest position will be memorized and recalled once the camera is run.The illumination level can also be readjusted while the camera is24Warning !Each time you're touching themirror, the viewing screen, oranything inside the lens port,disconnect the battery. Youwill therefore avoid any risk ofseriously damaging your came-ra.