Mamiya 645 PRO TL - Manual (Page 11)

Attaching and Removing Lenses
Removing the Front Body Cap
and Rear Cover Attaching the Lens
First remove the Front Body Cap in
the direction of the arrow, while push-
ing the Lens Release Button
backwards as indicated by arrow.
Rear Body Protective Cover can be
readily removed by depressing the
part of as shown in the illustra-
tion.
Line up red Lens Alignment Dot
against red camera Alignment Dot
and gently insert the lens into the
camera body. Then turn the lens
clock wise, as indicated by arrow,
until it clicks into place. Make sure
that the Aperture Ring Coupler Pin is
engaged with the Exposure Meter
Coupling Pin
which sticks out
under the Mamiya name plate of the
camera.
Removing the Lens.
While pushing lens release button
backwards, turn lens counter-
clockwise. (Same procedure as
removing body cap).