©2009-2013 KatzEye™ Optics Page 6 Revised: November 26, 2013
Addendum A: Screen Alignment & Focus Calibration
Screen Alignment
Because of the high precision manufacturing of the KatzEye™ focusing screen, the AF lights
should align well to the prisms and markings of the KatzEye™ focusing screen with no special
procedures. However, because of parallax, the position of your eye in the viewfinder can shift
the apparent alignment considerably. So before concluding there is an alignment problem,
move the camera back and forth slightly in front of your eye to be certain your eye is properly
centered in the viewfinder.
The alignment should be close without any special procedure, as long as the screen is
installed correctly. If the alignment appears very far off, it is recommended to check for correct
installation before proceeding. It also bears repeating that the apparent alignment can shift
substantially based on the position of your eye in the viewfinder, so you might want to move
your eye around a bit to be sure that there is actually a discrepancy. Also, bear in mind that
the alignment of the AF lights will not affect the focusing accuracy in any way. However, if it is
determined that there is an alignment discrepancy, the design of the camera does allow the
screen to be shifted slightly in its frame. It can only change the alignment a small amount; but
if you see a misalignment that is troubling, it is possible to move the screen to achieve perfect
alignment. It is not necessary, nor desirable, to remove the focusing screen to perform the
alignment. Simply unlatch the retainer, give the camera a gentle nudge, and re-latch the
retainer.
Please note that because of the optics of the pentaprism, left/right motion of the screen is
reversed; in other words, if the prism appears too far to the right, it will actually need to move
to the right to correct the alignment. And if it appears too far to the left, it will need to move to
the left. Vertical alignment is not readily adjustable. The alignment of the AF lights to the
prism will not affect the accuracy of the focusing functions in any way; so once the alignment is
close enough to be visually acceptable, the process is complete.
Calibration
The KatzEye™ focusing screen will maintain the exact calibration set by the factory, provided it
is correctly installed, and no special calibration procedures are required. If it is believed that
there is a calibration problem, users are strongly advised to first check for correct installation of
the focusing screen. If correct installation has been confirmed and there still appears to be a
calibration problem, please contact KatzEye™ Optics technical support for assistance.
