Canon FD Lens, Manual Book

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up lens is attached. Automatic exposure
is possible when these tubes are used in
conjunction with a macro auto ring and a
double cable release. Diaphragm control
is manual.
Vari-extension Tube M15-25/M30-55
These extension tubes feature adjusta-
ble lengths, simplifying focusing and
magnification changes during close-up
or macrophotography work. The M15-
25's tube length can be adjusted from
15mm to 25mm; the M30-55's length
can be adjusted from 30mm to 55mm.
The former provides magnifications
ranging from about 0.3 to 1x when
used with a 50mm standard lens, and
the range of magnifications provided by
the M30-55 is 0.6 to 1.2x. When a
close-up lens is used, magnification is
0.5 to 0.8x with the M15-25 and 0.8 to
1.4x with the M30-55.
Auto Bellows
The Auto bellows, a high-performance ac-
cessory, forms the nucleus of Canon's
close-up, macro, and copying systems.
Used with lenses (including a standard
50mm) and other close-up accessories, it
is capable of providing continuously
variable magnifications within a fixed
range. Also, when used with a double
cable release, there is no need for
manual aperture setting. Bellows length
can be varied from 39mm to 175mm for
magnifications ranging from 0.75 to 3.9x
with a 50mm macro lens. Magnifications
ranging from 1.3 to 3.4x are possible by
mounting the lens in reverse. Backward
and forward movement of the bellows is
controlled by means of a smooth, high
precision rack and pinion mechanism.
Focus is adjustable both on the camera
side and the lens side, and the camera
can be easily changed from the vertical
to the horizontal position and vice versa.
The Auto Bellows can broaden your
photographic horizons by letting you
photograph natural crystals, jewels, and
the extreme details of natural flora and
fauna.
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