pengland Offline Upload & Sell: On
|
m-a-x wrote:
Hello Nick, you're right with what you say about personal opinion.
The design of the rear of the lenses is a bit is different from the outside.
The aperture control ring of the 85L is plastic and does not *precisely* stop at the extreme aperture values but can be moved a little further. I reduced this little weakness during conversion, but could not fully eliminate it.
I found this inherent lack of precision (which is also to be found on the FD50L) quite surprising, considering they are "L" lenses.
The 85SSC has a metal aperture ring, the klicks are a little bit more distinct, and it stops very precisely at the extreme apertures. Plus, the aperture control ring is situated further away from the camera body, thus more accessible and a little bit more comfortable to operate.
I want to sell the 5D together with one of the 85ers to have funds for a 5D mkII ...Show more →
I agree that the aperture ring mechanism is more robust on the SSC series but I have never found there was a problem with a lack of positive stops or the presence of "slop" between stops on nFD lenses. In order to achieve defined stops on nFD lenses it is important that:
1) the aperture stop "roller" is seated properly and in good condition (not worn oval). It must also float smoothly in the square hole in the aperture ring.
2) the corresponding roller tension spring is in place and is correctly loaded. The clearance between the aperture ring and spacer above is critical not only to prevent the entrance of light and dirt etc....but also to determine spring tension. Lack of clearance will introduce friction and resistance to ring rotation. Excess clearance will reduce the load on the roller spring and make your stops sloppy. In worse cases it will also cause the aperture ring to "catch" when moving from the fully open position to the first or second stop down positions. This is caused when the aperture ring hits instead of slides under the back/adapter screw hole boss closest to the roller.
3) the stationary plastic detente strip (this is what I call it anyway) must be held solidly in place and must not have excessive wear between the "notches".
4) in the conversion of the aperture control mechanism you must NOT have introduced any kind of "lost motion". This could be caused by excessive play between the fabricated finger or tangs, weak attachments or lack of rigidity in the new mechanism at one or more points.
Are you going to give your 5D MkII a mirror shave to continue to use all your alts?
|