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These tubes are used as adapters to mount
OM System lenses on the OM body to take close-ups.
Each tube incorporates a coupling lever to automatically stop
down the lens diaphragm to the preset aperture at the exposure.
The respective lengths of these tubes are
7mm, 14mm and 25mm, which make seven different lengths
by single or combined uses.
They can be mounted on the camera body by bayonet mounting as
in case with the standard lenses.
If all of these tubes are used in conjunction with the 50mm F1.8,
it is possible to achieve a life size magnification or 2.3x3.4cm
with a lens-to-subject distance of 6.8cm.
For life-size pictures, however, most recommended is the 1:1
Macro 80mm F4.
NOTE:
The depth of field is extremely small in close-up work. Therefore,
not only correct focus but also a small aperture such as F8 or
F11 are recommended.
Even a smallest movement of the camera affects pictures especially
when enlarged to great extent. To avoid this, make it a point
to use a focusing stage, tripod and cable release whenever available. |
product.