I have a Jupiter 9 for Kiev mount that has very oiled aperture blades. 2 of them are already out of place. I have found 2 documents on the web that describe how to relube a Jupiter 9 but they don't explain how I can get into the housing where the blades are.
Does anybody has any hints for me? The glass block is screwed out, the rear lens removed, I can see and reach them, but I have to remove and clean them, they are very sticky.
Old Jupiter9 has the tendency of separate blades from its pins, by this same reason they are factory oiled and must be kept so.This is done in order to keep the blades tight, and reduce the external diaphram ring out to be loose. To do a good job you need not to dismantle the unit. With a needle or a fine jeweler screw drive you try to replace blades in the right position. Now clean everything with carbon tetrachloride, removing the old oil- Then place a drop no more than a drop of a new thin machine oil. Everyting is done. Reassemble the unit. LP
How to get to the aperture blades of a Jupiter 9?
Posted - Jun 29 2008 : 3:59:59 PM
