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Vivitar (komine) 400mm f5.6 disassembly
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PostPosted: Wed Nov 28, 2018 6:40 pm    Post subject: Vivitar (komine) 400mm f5.6 disassembly Reply with quote

I am cleaning this lens - fungus. Front end was easy. I am trying to figure out how to get at the rear group. This lens block focusses ie whole optical assembly moves. The rear group is in too deep to access from the mount end. It is clear I need to separate the lens at the helicoid. I am not sure if this is a double helicoid or just a set up with sliding rails that prevents the front end rotating.
I thought at first it might be like a soligor, that the focus sleeve would slide up out of the way once the 3 grub screws (one is arrowed in pic) under the rubber grip had been loosened. Not the case: the focus rotates freely but doesn't move up or down.
Not sure what to do next. I am wondering if I should rotate the focus to cfd, then loosen the grub screws, move the sleeve all the way back round to the infinity stop, retighten the grub screws and rotate again to the cfd stop...
Any ideas?



Update. I found this thread:

https://www.photrio.com/forum/threads/mating-tele-parts.145213/

So Actually I could separate the lens at the tripod mount. But then this guy couldn't reassemble!


PostPosted: Wed Feb 13, 2019 5:18 pm    Post subject: Reply with quote

I swapped messages with the poster of the thread i linked to. he never succeeded in fixing his lens. Rolling Eyes