Mr_Flibble
All-Pro
- Location
- The Lowlands
- Name
- Rick
I found that the lens tube on the Xenon had started to wobble a bit.
Luckily I'm getting pretty good at tearing it down quickly for adjustment:
-Unscrewed the entire unit in front of the aperture blades.
-Remove the outer aperture ring.
-Remove the lock screw on the knurled ring and remove that ring from the focus ring
-Loosen the 3 set screws around the lens tube behind the inner aperture ring
-Lock the lens tube in place through the service openings and unscrew the second unit that holds the aperture blades.
-The ring with the 3 set screws then sits free to lift out.
There are two guides on this last ring that slide in and out of openings in the focus mount. And these help keep the lens tube steady.
These guides consist of two tabs that are each split in two. On mine the two halves were pressed together causing the wobble.
I stuck a watchmaker screwdriver between the two halves of either tab to wedge them apart a bit.
Then when I slid the ring back in place I find the wobble is gone. Hurray!
After assembly and testing it on the M-E I find the lens has a slight front focus, when shooting wide-open at 1 meter. I'm talking about a 1 to 3 cm, which could be due to the LTM-adapter or my assembly skills. I'm not complaining. Will take the lens with me to the coast this weekend.
Pre-fix "game night"
Post-fix "focus test"
Luckily I'm getting pretty good at tearing it down quickly for adjustment:
-Unscrewed the entire unit in front of the aperture blades.
-Remove the outer aperture ring.
-Remove the lock screw on the knurled ring and remove that ring from the focus ring
-Loosen the 3 set screws around the lens tube behind the inner aperture ring
-Lock the lens tube in place through the service openings and unscrew the second unit that holds the aperture blades.
-The ring with the 3 set screws then sits free to lift out.
There are two guides on this last ring that slide in and out of openings in the focus mount. And these help keep the lens tube steady.
These guides consist of two tabs that are each split in two. On mine the two halves were pressed together causing the wobble.
I stuck a watchmaker screwdriver between the two halves of either tab to wedge them apart a bit.
Then when I slid the ring back in place I find the wobble is gone. Hurray!
After assembly and testing it on the M-E I find the lens has a slight front focus, when shooting wide-open at 1 meter. I'm talking about a 1 to 3 cm, which could be due to the LTM-adapter or my assembly skills. I'm not complaining. Will take the lens with me to the coast this weekend.
Pre-fix "game night"
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Post-fix "focus test"
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