Arjay
Time Traveller
I recently bought a CV Ultron 28mm/f2.0 M bayonet lens off of the bay. Cosmetically, the lens looks like new, but when I put it on my Hexar RF, it behaves very strangely:
I was shooting the obligatory roll of test shots only to find that when looking through my finder, the rangefinder can go beyond infinity! I tried to focus on an object some 400 - 500m (~ 1/4 mile) away, expecting this distance to be far enough as to pass as infinity. With this lens on my camera, the viewfinder has features coinciding before the lens is at its infinity stop - the difference is ~2 to 3 degrees.
My camera works correctly and consistently with both my Hexanon 35mm and 50mm lenses, so I think the Ultron is at fault.
So here's my question: Does anyone know whether it is possible to adjust the lenses RF coupling ring for correct rangefinder synchronization?
It appears that with M bayonet lens designs, there are some gears between the distance setting ring and the internal lens barrel that moves the optical system. The ring's angle of revolution as well as the sync ring's travel in relation to the lenses optical axis must be standardized, but obviously, the the optical system's travel is dependent on focal length (and probably other design-related parameters). This is why I am thinking that this type of design must offer some mechanism for rangefinder sync alignment. And no, aligning the camera's RF cam isn't the solution because that would throw all other lenses out of sync.
So, can anybody confirm that such an adjustment is possible?
I was shooting the obligatory roll of test shots only to find that when looking through my finder, the rangefinder can go beyond infinity! I tried to focus on an object some 400 - 500m (~ 1/4 mile) away, expecting this distance to be far enough as to pass as infinity. With this lens on my camera, the viewfinder has features coinciding before the lens is at its infinity stop - the difference is ~2 to 3 degrees.
My camera works correctly and consistently with both my Hexanon 35mm and 50mm lenses, so I think the Ultron is at fault.
So here's my question: Does anyone know whether it is possible to adjust the lenses RF coupling ring for correct rangefinder synchronization?
It appears that with M bayonet lens designs, there are some gears between the distance setting ring and the internal lens barrel that moves the optical system. The ring's angle of revolution as well as the sync ring's travel in relation to the lenses optical axis must be standardized, but obviously, the the optical system's travel is dependent on focal length (and probably other design-related parameters). This is why I am thinking that this type of design must offer some mechanism for rangefinder sync alignment. And no, aligning the camera's RF cam isn't the solution because that would throw all other lenses out of sync.
So, can anybody confirm that such an adjustment is possible?
