Question about Mamiya K/L 65mm f/4 RB Lens

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Mamiya-sekor C 65mm lense

I have mildew in the first part of the lense looking from the front.

How do I get access to the first lens glass to clean it...

Tried undoing the the outer ring, next to the focusing ring, now the lens seems loose...

Can anybody help... camera needed for tomorrows shoot...


Dave Boulter

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Re: Mamiya-sekor C 65mm lense

Any luck with the lens?
Need help?

Posted on Dec 23, 2007

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Is it possible to take apart & clean a Hanimex 72-162mm lens? If so, how?

Is it possible yes, is it recommended no. Lenses are full of little tiny precise parts that are difficult to assemble. The smuges you see are probably mildew. This will eat into the coating on the lens. Hanimex was a an importer based in Australia. They did not manufacture lenses themselves. I have used many legacy lenses on Olympus cameras, Hanimex and others. As a general rule I found these lenses did OK as a macro but only average in general use.

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Do you have a lens collimator and other equipment necessary to ensure proper alignment when reassembling the lens? If not, then take the lens to a good camera shop and have a properly trained and equipped professional do the job.

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Manual pdf

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How to fix the lens, how to open it, need to fix the shooter speed, please someone i will try to explain better if someone knows something

The problem with this Sekor shutter units is that they become stuck by dirt, rust or grease and sometimes is impossible to fix it. In this model the lens unit can be seriouslly damaged if you try to charge it even it is so hard to move.

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To repair the obturator the lens its a fixed lense how to open and fix it?

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After you take the front gropu out there is a nut that holds all the shutter unit attached to the camera. Turn it to the left to placed it out and then take the mechanism off. Be sure the are no other parts connected between shutter and camera before pull it out.

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My camera shutter is stuck and all I see through the lens is black?

Need servicing from the service center. They disassemble the camera & unlock the shutter from internal side.

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Hi I wonder if you could help me ? I have inherited two lenses. One is a mamiya/sekor SX 1:28 f=135mm. This is a no 41974. It also has a detachable screw lense on bottom APS Auto Teleplus 2X which I am not...

The Tessar lens has a secondhand value of about £25GBP. The other lens may be slightly harder to value as i am not familiar with it. One way to find a value is to use ebay and search the completed listings.

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Fauly aperture ring on mamiya/sekor 135mm f2.8 m42 lens

Does the aperture work when you turn the ring and push the aperture pin on the mount in? The lens should close down to the set aperture when you do this. If it does, then atleast the lens is useable.
What is missing is the detent for the click stops. This is a spring loaded ball bearing that 'clicks' into notches inside the ring. If this is broken or missing, finding a spring the right size might be a challenge, the ball bearing less so. To remove the ring and base, unscrew 3 screws coinciding with the 3 notches in the back plate, visible when you set the ring to f8. the back should lift off easily. don't lose the screws. The ball bearing, if it is still there, should protrude from a small hole in the lens barrel in line with the f stop index mark on the lens. Good luck.
P.S. The above is based on how my 200mm is designed so I'm making some assumptions that the 135mm is put together much the same.

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1 Answer

Manuel lens dos not turn any more

most likely some of the gears are offline or collapsed. when that happens it gets difficult to turn. you could send it to mamiya for an estimate or to

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