Mamiya Rb67 Lens Stuck

Discussion in 'Medium Format Cameras and Accessories' started by jazzmechanic, Jun 10, 2005.

  1. jazzmechanic

    jazzmechanic Member

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    I want to replace the 127mm lens on my RB67 to a 90mm but I can't get the $$^%%@!! off. I followed the instructions in the manual and the dang blasted thing wont come off. Okay excuse my language.

    I am trying to exchange the 127mm lens and after following the instructions, I still cannot remove it. I have read the manual ten times.

    Any ideas?

    Thanks
     
  2. rogueish

    rogueish Member

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    I know this may sound stupid but you did "cock" the shutter right?
    I know, I know, you read the manual. I have found the 90mm I have tends to stick. It could be tight threads on the collar. I do not recommend using a pipe wrench!
    If it really is an internal problem, the wrench could ruin the threads and/or inner workings. If I was to get totally desperate and didn't want to take it to a shop, I might (not that I'm admitting this of course) try lightly applying a pipe wrench. If it still didn't budge, take it to a shop.
     
  3. jazzmechanic

    jazzmechanic Member

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    I Think So

    I followed the instructions in the manual, but I will try one more time. In the morning, I plan to take it to my local photo shop.

    Thanks
     
  4. Rock Poper

    Rock Poper Member

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    ya, the only time I had issues with lens removal was because of not cocking the shutter... - perhaps it hasn't cocked properly ? I own an RZ so its the same with lens mounts, but what I suggest may work different with RB - however: try tripping the shutter (removing the back , or somehow keep the dark slide in), stick it on multiple exposure (so as not to advance the unexposed frame) and cock it again ?
     
  5. paul ron

    paul ron Member

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    There is a way to get a locked lens off. Looking at the front of the lens. The right triangle of leather where it says PRO-S has to be peeled off. There is a little hole where you can put a paper clip in to push the lock down as you turn the retainer ring. Once you get the red beads lined up, still pushing the lock down, wiggle the lens off carefully as it will catch the lip of the mount as you get it off.

    e-mail me, I'll send you a couple visuals of the hole and the lock?
    automax1@juno.com
    Paul NYC
     
  6. jazzmechanic

    jazzmechanic Member

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    Happy Camper -- Hold Shutter Lever Foward

    Yeaaaaa, I can change my lens at will now. Key is to hold the shutter lever forward, while turniing the lens ring counterclockwise.
     
  7. rogueish

    rogueish Member

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    Glad to hear you got it solved! I'll have to remember and try that the next time my 90mm sticks.
     
  8. TimVance

    TimVance Member

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    Ok I tried all that and I can't get my 90 kl off of my pro sd body. This is so lame....

    BTW there is no hole on the pro sd body!!
     
  9. valdoo

    valdoo Member

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    @TimVance Just make it clear even after so long time. There is a hole on Pro SD as well as it is on Pro S. You gonna have to tear more of the leather. When you uncover enough to see little screw, the hole will be right next to it very close to the ring. You can try to find it with needle without tearing, which might be harder to manipulate but would work if you are patient enough...

    Vlad
     
  10. unclemack

    unclemack Member

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    Tim, there are two different front panels which may be fitted on a Pro SD, a fact I learned only recently despite owning RB's for years & having been a repairer myself until 2000.
    One is the same as on the Pro S and the advice already given is good.
    The other type apparently has an all-plastic front cover and the "Pro SD" badge just clicks off to reveal the hole. Both types look the same - I believe the plastic version must be later than the metal one.
    A straightened-out paper clip or similar is pushed gently towards the centre of the lens to trip the release. There is nothing inside that will be damaged, just keep trying slightly different directions & twisting the locking ring. A slight curve to the paper clip helps.
     
  11. unclemack

    unclemack Member

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    Jazzmechanic, your symptom indicates that the cocking ring of your body isn't reaching the correct angle when cocked - when this happens it's not usually long before the shutter starts missing.
    The small gear below the cocking ring which drives it is often the first to fail, the teeth wear away.
    It can be examined by removing the small screws holding the front panel.
    Not all the teeth are used and a repairer can extend its life easily by rotating it to use previously unused teeth if a spare gear is unavailable or if money or time are at issue.
    Takes less than an hour if it's done before further failure.
     
  12. EricEvanLee

    EricEvanLee Member

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    Thank you guys greatly for the paper clip trick. It worked, and I'm so grateful. I appreciate your advice, it was good.
     
  13. smcclarin

    smcclarin Member

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    I want to personally thank you for the advice on this issue! it worked perfectly on my jammed mamiya RB67 Pro S I must have erroneously put on my lens un cocked on the non cocked body when it jammed. I was cautious not to force anything. and now it works again! I know your help just saved me a bunch of money better spent on gear! APUG RULES!!!!:cool: Your advice has been GOLDEN in my circumstance and I am back in action!!!! Thank you thank you thank you!!!