Mamiya M645 Auto Extension Rings User manual

To take close-up photographs    CAUTION
from a distance shorter than the      *These  auto extension rings
minimum  permissible photo-      are designed for use with the
graphing distance of your lens,    B0mm f/1.9 and t/2.8  lenses.
use these Auto Extension Rings,    When used with other lenses
whereby close-up photography      vignetting may result.
or reproduction can be accom-      *No.3 & No.3-S Rings
plished as easily as taking con-     The No.3 ring is designed for
ventional photographs.                                  exclusive use with the BOmm
 Mamiya Auto Extension Rings       f/2.8 lens. lt should not be used
are  available  in  three  types                                on the f/1.9 lens as it may result
(No.1, No.2, and No.3-S), and                                           in vignetting.The No.3-S ring is
each ring  interlocks with the                                 designed for use with either ofautomatic diaphragm  of  the                                     the BOmm lenses. When usinglens. The same operating pro-                                    other rings together with the
cedure  applies  to   all  three                                No.3-S ring, always place thetypes.                                No.3-S  ring  closest  to  the
                               camera body.

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o Names of Parts
1. Lens releasebutton         7. Alignmentred line for
2. Couplerring              camera body
3. Aperturering coupler        8. Alignment red line for
4. Diaphragmactuatinglever    coupler
5. Knurledring                 9. Alignmentdot for lens
6. Diaphragmactuatingpin

. Attaching the Extension Ring





1 . While grippingthe knurledring      line (8) as shown in the photo-
(5) of the extension ring in one     graph.
hand, and rotating the coupler    2.By rotatingthe aperture ring,
ring (2) with the other hand,align     set   it  at the widest aperture
the position of the aperture ring     (t/1.9or t/2.8).
coupler (3) with the alignment                          www.orphancameras.com

3. When the extensionring and
the lens are fitted after aligning
the alignmentdot (A) of the lens
with the alignmentdot (9) of the
extensionring, the couplers of
the extension ring and the lens
will also be set simultaneously.
(The role of this coupleris to in-
terlock with the exposuremeter
whenthe PD or CdS prismfinder
is employed.When the PD or
CdS prismfinder is not employ-
ed, connectingthe coupleris un-
necessary.)
4. When the extensionring and
the lens have been alignedand
fitted, rotate the lens clockwise
until it stops. (When the lens is
rotated up to the stop position,
the lens release button (1)pops
                           4

out to lock it.)
CAUTION:
 When rotatingthe lens, always
 grip the knurledring (5)of the ex-
tensionring.Shouldthe coupler
 ring (2) also be gripped simulta-
 neously,the lens canncitbe ro-
 tated.
5. When combinedwith an addi-
tional extensionring, the added
 ring must also be preliminarily
set as describedin ltem 1. Con-
nect the two extensionringsafter
aligningthe alignmentline (7)of
the front extensionring with the
alignmentdot (9) of the rear ring;
then rotate the front ring clock-
wise until it stops. (ln this in-
 stance, grip the knurled ring of
the rear ring.)
5                           www.orphancameras.com

6. When attachingthe rings and
                                     lens to the camera body, attach
                               them after aligningthe alignment
                                           line (7)with the alignmentdot (B)
                                           of the camera body, and rotate
                                     the lens clockwise until it stops.
It                            CAUTION:When two or three extension
lllu:                                       rings are employed in combina-
                                              tion, grip the lens and rotate it
                                     clockwise until it stops, and then
                                   proceed with  photography.   lf
                                  photography is attempted when
                                     the fens/ring are slightly dislo-
                                   cated by turning counterclock-
                                  wise withinthe backlash,the au-
                                    tomatic diaphragm may occa-
                                       sionally fail to  interlock com-
                                         pletely.
                                                               5

o Removingthe ExtensionRing



                                 1 . When removingthe lens, ini-
                                             tially remove the extension ring
                                from the camerabody combined
                                    with the lens.To remove the ex-
                                  tensionring,rotatethe extension
                                      ring counterclockwise until  it
                                   stops, while depressingthe re-
                                 lease button (C) of the camera
                                 body.





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2.The lenscan be removedfrom
the extensionring by rotatingthe
lens counterclockwiseuntil  it
stops,while grippingthe knurled
ring (5) of the extensionring and
depressingthe lens releasebut-
ton (1).

1. Distances shown in the close-     turetaking is effected in the same
up photography table  indicate    manner as for conventional pho-
distance from the front edge  of     tography.  However, when  the
the lens barrel to the subject.        lens  is extended  lor  close-up
2. Figures in the left column of     photography, and distance be-
the table indicate the lens when    tween the lens and film plane in-
unextended. Figures on the right    creases beyond normal, image
indicatethe lens extended to the     brightness on the film plane de-
closest focusing distance.          creases, requiring an increase in
 The Auto Extension Ring inter-    exposure. To adjust the expo-
locks with the  automatic dia-     sure, refer to the exposure factor
phragm of the lens, whereby pic-     prescribed in the close-up pho-
                                 tography table.
     The relationshipbetween the exposure factor and the
     amountof exposureincreaseis shownbelow.
        Exposurefactor        (X)
        Apertureopeningdegree (stop)

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Theie is no need to make ex-      Sinceeven very slight camera
posure calculationswhen using   movementaffectspicturesharP-
the PD or CdS Prism Finder.    ness,mirrorlock-upphotograPhY
However, since the amount of      is recommended.Stop downthe
light reaching the film varies in    apertureto f/11or smallerto ob-
accordance with the lens ex-     tain satisfactorylens perform-
tension, be sure to make the    ance.
exposure measurement AFTER
focusing the  lens. Moreover,
always keep your eye close to
the eyecup whenever making
an exposure measurement to
prevent the possibility of extra-
neous light from entering the
eyepiece and undulyinfluencing
the reading, resulting in under-
exposure.