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10-09-2018, 04:04 AM   #1
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Location: Apeldoorn, The Netherlands
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Remove camera mount from SMC PENTAX untra tele lensel

Hi,

I posted this question in another thread with no response, so this is a new try.

Should it be possible to remove the camera mount of the ultra tele lenses by applying enough torque to turn the knurled ring counter clockwise? I acquired a SMC Pentax F11 1000mm mirror reflex lens where the ring refuses to turn when I aply all force I can by hand. Can this ring get stuck, so that I neeed to apply more mechanical force? I did apply some penetrating oil with no result. Is it correct that the knurled ring has an internal screw thread? Is there a defined mounting angle for the camera mount?

See pictures in my other thread: https://www.pentaxforums.com/forums/189-repairs-warranty-service/376470-dissa...-cleaning.html

Any help is much appreciated!

10-10-2018, 03:43 AM - 1 Like   #2
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Join Date: Mar 2018
Location: Apeldoorn, The Netherlands
Posts: 59
Original Poster
I did it!

I managed to remove the mount! Unknown what action made it work. I carefully added penetrating oil via the three holes in the mounting ring and additionally I had the help of my wife (holding the lens firmly) why I grapped the mounting ring using rubberized gloves to have more grip. And then it came loose. Obviously the mounting ring was at least turned 20 degs too far clockwise. Maybe the former owner was too anxious the ring would loosen with a mounted camera.

Lessons learned:
That mounting ring can get stucked firmly;
Carefully applying penetrating oil might help;
Much torque can be needed to unscrew the mounting ring;
Rubberized gloves improve grip on the ring;
Ask your wife (or somebody else) to hold the lens body firmly.

Regards,

Wim
10-10-2018, 04:44 AM   #3
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Glad to hear you got it figured out. Help sometimes comes from the different places and sometimes just in the house. eh?

Just a note though, in case you have another lens problem, if you'd posted this in our Lens forum, you probably would have gotten an answer sooner.
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