Spiratone 400mm f/6.3 instructions User manual

The SPIRATONE 400 is a lightweight, true telephoto lens yielding BX image magnification as compareci
with the normal lens.

MOUNTING THtr LENS TO YOUR CAMERA.
The SPIRATONE 400 is a "T" mount lens. It is supplied with the appropriate "T" adapter for your
SLR camera. Screw the "T" adapter onto the lens and mount the lens to the camera body in
the usual manner. If the lens scaie is not centcred in the upright position, loosen the three setscre$'s
in the "T" adapter, rotate the lens so that the scale is centered, ancl retighten the setscrcws.

                                                                                                                                                                 Digitally signed by mike butkus

                                                                                                                                         email=mike@butkus.org,                                                                                                                                          c=US                         mike butkus ou=29,Date: 2018.05.02                                                                                                                                                             18:00:17 -04'00'THE PRE.SET DIAPHRAGM.                                                    DN: cn=mike butkus, o=orphancameras,
The pre-set diaphragm is calibrated lrom f/6.3 to  f /32. Set the upper pre-set diaphragm ring to the clesired
f'stop as determined by an exposure meter. Rotate the operating diaphragm ring just below the
calibrated ring counter clockwise as far as it will go. This opens the diaphragnr fully to ff63 {or
maximum brightness in focusing and composing.
After focusing, rotate the operating diaphragm ring clockwise as far as it will go.
The diaphragm is now stopped down to the pre-set aperture and the shutter may now be tripped

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DEPTH OF F'IELD.
An engraved depth of field scale indicates the range of sharpness with the SPIRATONE 400 for any
distance and f stop combination. Example: if the lens is focused to 100 feet and the diaphragm is
stopped down to {/22, the depth of field scale indicates opposite 22 on the left and right a range of
sharp focus from B0 feet to about 125 feet.                                     t:                           &"rKurTRIPOD COLLAR.
Ihe SPIRATONE 400 may be hand held at fast shutter speeds, but for maximum definition the use of a tripod
is recommended. Mount the tripod to the tripod collar. The collar may be rotated to permit vertical or
horizontal composition.

FILTERS.
The SPIRATONE 400 uses custom 72 mm size filters or series IX 72 mm adapter for standard series
IX accessories.
The use of a haze filter is generally recommended in telephotography.

SLR CAMEIT,AS AND TELEI'HOTO LENSES.
The effectiveness of the various types of focusing screens varies.with  the focal Iength and the
speed of the lens. The rangefinder or microgrid prisms built into the groundglass do not work as
lvell with longer focal length lenses as with the normal lens and may black out. When such
conditions exist, focusing is best done on the groundglass portion of the viewing screen. On some
SLR cameras, long lenses seem to produce an apparent outoff, primarily  in the upper corners or
along the entire upper edge of the viewfinder.  Actually,  such viewing cutoff is caused by the size
of the camera's mirror  which is adequate for the shorter focal length lenses only. The slide or
negative will be full and unaffected by this viewing deficiency.





                                                                                             Printed in Japan.