Canon FD Lens Manual Book page 44

Accessories Guide II
Extender FD2x A/FD2x-B/FD1.4x-A
Use of a Canon extender means a single
lens can be increased by a factor of 1.4
or 2, thus allowing one lens to serve the
function of two. The FD2x-A, designed
for use with 300mm or longer telephotos
and the FD 200mm f/4 Macro, can double
the focal length of the lens on which it is
mounted. It can also be used with zoom
lenses which include a 300mm focal
length. For lenses (including zooms) which
have a maximum focal length of less
than 300mm, the FD2x-B gives you a
2x increase in focal length. It is also
recommended for use with the FD
300mm f/2.8L. The FD1.4x-A increases
300mm or longer fixed focal length
lenses 1.4x. Naturally, all Canon exten-
ders couple with the automatic dia-
phragm mechanism in the camera, so AE
photography can be carried out as usual.
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Close-up Lens 240/450
These convenient
screwed onto the front of a lens, just like
a filter, for easy closeup photography.
There is little additional weight, and the
main lens's aperture remains unchang-
ed. These lenses are available in two
types for all filter diameters: 450 and
240. These numbers stand for their focal
lengths (mm) and are equal to the
shooting distance in millimeters from
the lens's front to the subject when the
lens is focused at infinity. For example,
use of the 240 with a 50mm standard
lens increases image magnification from
about 0.2 (1/5 of life size) to 0.35x; with
the 450, image magnification is increas-
ed from about 0.1 to about 0.25x.
Extension Tube FD15-U/FD25-U/FD50-U
These 15mm, 25mm, and 50mm tubes
attachments are
let
placed
camera body. Since they synchronize
with the camera's automatic diaphragm,
AE photography is possible. When used
with close-up lenses, even larger mag-
nifications are possible.
Extension Tube M Set
This set includes one 5mm, one 10mm,
and two 20mm tubes and can be combin-
ed to provide a total length of 55mm.
Used in various combinations, suitable
magnifications
closeup and macro photography. For
closeup photography, magnification pro-
vided when all five tubes are used in
combination with a 50mm standard lens
is greater than 1x, and even greater
magnification is achieved when a close-
you take close-up shots
between the lens and
can be obtained
when
the
for