Pentax 6x7 Manual page 12

_ ACCESSORY FILTERS _ _ _ _ _ _ _ _ _ _ _ _ _ •
Filters Attaching to the front of the lens
The 55mm f / 4 lens uses 77mm screw-in
filters that fit the threads on the front of the
lens. In addition, the spring-type lens hood
for this lens may be attached over the filter .
The 75mm lens, the standard lens, and
telephoto lenses through 300mm focal length
accept bayonet mounting filters of different
sizes. These filters attach to the front rim of
the lens via two bayonet tabs.
In the case of the 90mm and 105mm lens,
as well as the 135mm and 150mm lenses,
the respective lens hood may be mounted
over the filter.
Except for the polarizing filter , use of two
filters together is not recommended .
Filters Attaching to the Rear of the Lens
.Telephoto lenses from 400mm through
1000mm (except the 500mm lens) are de -
signed to accept both 77mm 67 bayonet
filters and 77mm Pentax screw-in filters (SMC
Pentax M* ED (F) 800mm f/ 6.7 via a filter
frame) . Both types mount to the rear of the
lens. Before mounting either, the filter
adaptor ring which is housed in the lens
mount will