Durst DA-900 - Focus Variator Adjustment

using so-called automatic exposure easels, etc.) is not in direct contact
with the base board (2). The locking knob (35) located at the rear
at the same height as the focus variator wheel-grips arrests
the steel band and thereby holds the focusing plane in position.
This can be read
off on the scale upon the enlarger column
(4). If you desire to enlarge directly upon the projection board (2)
again, be sure
not to forget to return the focus variator wheel-grips
back
to their original position, as otherwise out-of-focus pictures will
result. To do this, loosen the locking knob (35) slowly and gently brake
the return of the focus variator with the hand.
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