The OM Series lenses have the aperture control located on the lens barrel on the opposite side of the focusing ring from the mount. This was done to move it away from the shutter speed control, which is a ring on the camera body immediately behind the lens mount. They also feature a depth of field preview button on the lens itself as opposed to the OM bodies.
The OM lens is designed to sit 46 mm (as measured from the front of the aluminium ring on which the serial number is stamped) from the film onto which it projects, further away than many other lens systems. The combination of on-lens aperture control and this extra distance make OM lenses adaptable with full (manual) functionality to a variety of other camera systems, including the ubiquitous Canon EOS line with a specialized adapter.
[source: http://en.wikipedia.org/wiki/Olympus_OM]
Untitled Document
Canon FD to EF
conversion
We do carry out conversion of Canon FD mount to EF mount.
We are working on other conversion for other mounts as well..
There are some limitations in conversion but we are here to adjust a lens for various camera mounts.
