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M42x1-Canon EOS adapter with electronic focus confirmation |
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M42x1-Canon
EOS adapter with electronic focus confirmation
This adapter allows the use of M42 (Pentax Screw Mount) lenses on any Canon
EOS camera body. Such lenses are made by Praktica and Zenit and are also easily
found on the used lens market from such manufacturers as Pentax.
Although all M42 lenses are manual focus, this adapter retains the operation
of the camera's electronic "in-focus" indicators - a green circle appearing
in the viewfinder and an audible "beep" - to confirm best focus. If the shutter
is 1/2 depressed and the lens manually focused, the camera will indicate when
best focus has been achieved. Simpler M42 adapters lacking electronic contacts
do not allow the camera to provide any electronic focus confirmation and focus
can only be judged by observing the image on the viewfinder screen. This can
be quite difficult, especially with slow and/or wideangle lenses.
Since M42 mount lenses have a manually operated aperture, camera modes which
control exposure by automatically adjusting aperture are not available. However
full autoexposure operation is available in Aperture Priority mode and the camera
can also be operated in manual exposure mode using in-camera metering. In manual
mode the shutter speed is set on the camera, while the aperture is set on the
lens. In Aperture priority mode the aperture is set on the lens and the camera
will automatically set the shutter speed to provide the correct exposure.
M42 lenses mounted on EOS bodies via this adapter do not interfere with camera
operation and allow the use of mirror lockup.
Written by Bob Atkins
"How
to use" by Bob Atkins
Compatible with Canon DIGITAL and FILM cameras
 
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