This compact and lightweight extension ring set slides
on or off your camera in seconds to achieve a wide range of
magnification ratios. Each of the extension rings included can be used
alone or in combination to vary the magnification ratio. The shorter
the distance between the object and the lens, the longer the
magnification ratio is. They provide an easy way to compose, focus and
meter at the brightest, fullest aperture without stopping down the lens
manually before shooting. Through-the-lens (TTL) exposure control will
automatically compensate for the lens extension.
The magnification ratio is calculated as follows:
(Assuming that the lens is set to infinity)
Length of added extension
Magnification ratio =
-----------------------------------------------
Focal
length of the lens
Effective aperture = (Set Aperture) x (1 + Magnification
ratio)
This ring set consists of 5 rings. It perfectly couples with spot
metering and AE mechanisms. The ring that attaches to the camera has
male thread while that attaches to the lens has female bayonet mount
type. For the other 3 rings, the male thread matches with the female
one so there are altogether 7 combinations to obtain various
magnifications. The lengths of the three rings are 9mm, 16mm and 30mm
respectively. All measurements are from the image plane marked on the
camera body to the object.
** Please note that you can only use manual focusing when the rings are
in use. Moreover, the tube does not have electronic contact and
therefore, does not allow aperture to be controlled by the camera body.
Please check your lenses carefully before purchasing the extension tube.
Specifications:
- (Third-party) Macro
Extension Tube Set for M42 Screw Mount Camera Body;
- Compatible camera
models: All M42 screw-mount camera bodies including:
- Praktica PLC2, EE 2
and EE 3;
- Fujica ST901;;
- Olympus FTL;
- Pentax
Spotmatic F, ES and ESII;
- Yashica Electro AX;
- Ricoh TLS-EE;
- Petri-designed Exakta
FE 2000;
- Compatible lenses:
All M42 screw-mount lenses that has long enough depth of field;
- 5 rings are
included:
- Ring to camera:
male thread;
- Ring to lens:
female baynoet mount;
- Ring 1: 9mm;
- Ring 2: 16mm;
- Ring 3: 30mm;
- Made of metal (not
plastic);
- Black in color;
- Brand new, never
used.
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