AAton XTRprod, User Manual

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2.1 LENSES
The XTRprod’s flexible lens mounting system allows for the use of a wide
variety of 16mm, 35mm and still-photographic lenses.
2.1.1 ArriPL Lens Port
The ArriPL lens port is the standard mounting system delivered wi-
th the XTRprod and allows the use of all 16 and 35mm ArriPL
mounted motion picture lenses. PL lens adaptors are available for
Arri standard and Arri bayonet mounted lenses. This mount is ideal
for rental facilities, where a mounting system compatible with other
manufacturer’s 16 and 35mm cameras is often desired. The specific
flange focal distance (FFD) of the XTRprod with PL port is 52mm
-8 to -17µm.
2.1.2 Installing the Lens
To install the lens on the camera body, turn the outer locking ring
counter-clockwise until it reaches its stop. If the port cap is on, re-
move it. Align the four protruding flanges on the lens with the four
corresponding cutaways in the locking ring and insert the lens into
the camera port so that its flanges rest evenly against the lens seat.
Tighten the locking ring by turning clockwise until the lens is secu-
red in place and the lock ring is firmly set. Make sure the lock ring
18
Flange focal distance
Refers to the critical distance
from the lens seat to the film
plane. The precise FFD of the
XTRprod is 52mm -8 to -
17µm as measured with a dep-
th gauge in the lens port. It is
recommended that these tole-
rances be checked and main-
tained by a qualified techni-
cian. The combination of FFD
and back focus distance of a
lens directly affects precise fo-
cus and overall image sharp-
ness. Make sure these critical
measurements are strictly
upheld. When using an unfa-
miliar lens for the first time,
check that the eye focus
matches the tape-measured fo-
cus marks of the lens, and / or
shoot a focus test.