Focusing; Lighting; Exposure Determination - Mamiya Auto Bellows M645 Instructions Manual

1. Attach the lens reversed on the Auto Bellows after attaching
the RS Ring on the lens. 2. Fit the CN Ring into the lens by
aligning the red dot on the ring with the Alignment Dot on the
lens and turn the ring clockwise until it stops. (Fig. 25)
(For detaching the ring, turn the ring counterclockwise while
pushing the release lever located at the opposite side of the ring
from the red dot.)
3. Detach the FIT Ring of the Bellows Lens Hood and screw it
into the CN Ring until it stops. ( F ig. 26 )
4. Attach the Bellows Lens Hood on the RT Ring and fasten with
the locking screw.

Focusing

1. Extend the Auto Bellows so that the indicator mark aligns
with the triangular mark on the scale which corresponds to the
format of the original slide and fasten with the lock screw.
2. Extend the Bellows Lens Hood so that the indicator mark
aligns with the picture format indication on the scale bar for
rough focusing. The alignment with an f/1 .9 lens is by the
orange indicator and with an f/2.8 lens by the white indicator.
(Fig. 27)
3. Adjust the extension of the Bellows Lens Hood while looking
through the finder for critical focusing. After focusing, fasten the
extension locking screw.
* The triangular marks on the scale of the Auto Bellows are
color-coded as shown on the scale - green for 6 x 7cm, blue for
6 x 6cm, black for 6 x 4.5cm and red for 35mm formats. These
marks are applicable only for 80mm lenses.
* The triangular marks provide "safety margins." in duplicating
the originals. At this mark the image is slightly l arger than
life-size. This is to prevent the slide mount edges from cutting
into the duplicate. If necessary, you may further adjust the Auto
Bellows extension to vary the magnification by shifting the
extension a little from the designated triangular mark.
Also you may blow up a portion of the original by the larger
magnifications and utilizing the shift movement of the Front
Standard. When using the shift movement, be careful not to
vignette the picture edges.

Lighting

As a light source, available light (sunlight) or artificial lighting
such as the photoflood lamp
lighting and electronic flash are often utilized in slide duplicating.
Available light may produce better results. Some experimenting
is recommended.
With B & W Film
When using available light, s et the Diffusion Plate of the Copy
Attachment toward the window.
When using a photoflood lamp, be sure to keep an adequate
distance between the lamp and the attachment to prevent
adverse effects of heat on film and uneven illumination. A better
method is to place a smooth white cardboard m front of the
attachment and to illuminate u with the lamp from the camera
side. The light reflected from white cardboard will generally
produce soft, even illumination.
With Color Film
With daylight type color film, direct sunlight, electronic flash or
a blue photoflood lamp designed for color film are suitable.
With other types of the light source, be sure to use the proper
light balancing filters. Even with the sunlight, light balancing
filters are necessary in the morning and evening and in
shadows.

Exposure Determination

With the PD Prism Finder or the CdS Prism Finder, the correct
exposure is acquired by following the meter indications.
With a hand-held exposure meter, the following method should
be utilized:
1. After completing the picture-taking preparations and setting
the adequate light source, detach the Bellows Lens Hood from
the lens while retaining the original film on the lens hood.
(Detach the RT Ring and attach it on the Bellows Lens Hood.)
2. Face the Bellows lens Hood to the light source and meter the
brightness of the film plane of the original film by setting a
hand-held exposure meter at rear of the lens hood. In this
exposure measurement, keep the same light-to-lens hood
distance as the hood is set on the lens. Otherwise the exposure
reading may vary. With an incident/reflected light exposure
meter, set the meter at the reflected light mode.
3. The exposure value indicated by the exposure meter should
be compensated by the bellows extension. For details, see the
"Reading Scales" section on p.6. For exposure compensation
with lenses other than 80mm lenses, see the Close-Up
Photography Table.
* When using an electronic flash as the light source, make test
shots and keep notes to acquire the data on the correct
exposure and determine exposure according to the data for later
copies.
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