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K-5IIs Lens Mount Repair
Posted By: DaveR, 10-17-2015, 10:20 PM

I donít post much as Iím time poor and slow on a keyboard, but I have numerous times been much helped by the posts and information given by others, so an opportunity to give backÖ

A few months ago while on a job covering school age gymnastics, while I was using my 2nd body, a K-5 with a wide lens, my main body (a K-5IIs) with Sigma 70-200mm 2.8 attached, rolled off a trampoline and landed on concrete. I didnít see it but heard the crash. The lens parted company with the body pulling the mount off the body. I cried, literally.

(see photo 1)

The lens was ok, but it had pulled the metal body mount ring off the body. The 5 mounting points on the body had screw threads pulled out and some had pieces broken off or out of them, meaning that it wasnít just a case of screwing it back on. Also the metal mount ring and contact spring were also bent. (+ a spring locating pin/spigot was broken off).

(see photos 2,3 & 4)

I sent it to the distributors in Australia (CR Kennedy) for a repair quote and was informed it was not economical to repair, needing a replacement mirror box assembly (the Ďcoreí of the camera). This means a full day for a technician replacing and then adjusting and calibrating numerous components to obtain correct alignment. I obtained a Pentax service manual and had some idea of the magnitude of the work involved.

Funds for a K-3II were donated by my generous (& gorgeous) partner and said body obtained. It seemed a shame and a waste of a good body though so I made enquiries about repairing the K-5IIs.

Some of the info I discovered:
∑ The mirror box seems to be basically the same for all models from K10 through to K3.
∑ The material is a carbon fibre re-inforced plastic that doesnít like super glues.
∑ Alignment is critical to achieve proper focus side to side and top to bottom.
∑ I didnít like the idea of just gluing the screws back in so I checked the depth of the screw holes and sought longer screws
∑ The flash head of a Pentax AF-360FGZ Flash has 2 screws the same diameter (2mm) as the mount ring, but longer Ė 20mm vs 4.5mm. But the heads are larger and thicker.

(see photos 5,6,7,8 & 9)

Continued in Part 2

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Last edited by DaveR; 10-17-2015 at 10:29 PM. Reason: Photos didn't appear
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10-19-2015, 11:55 AM   #16
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that's impressive. great job

10-21-2015, 11:15 AM   #17
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Thanks for the info,just bent my lens mount,but not as bad,so hope the screw holes are ok
where did you get the replacement ring? will Pentax sell to you
07-03-2016, 05:02 AM   #18
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I came on this site looking for help mending a sick K-x, saw from your excellent pictures the mount spring should have a black wire soldered to it. Mine was missing. I made a temporary repair with copper tape which worked as shown in my pictures.Your article will be a great help when I make a permanent repair. Many thanks.
10-19-2016, 01:22 AM   #19
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Regarding the K-x, I re-soldered the mount spring and the camera now works fine. I had to remove the front of the camera to retrieve the black wire and your pictures proved invaluable. Thanks again

10-19-2016, 02:42 AM   #20
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No worries Webby.

I have benefitted from info that others have posted on this and other forums, so it is good to be able to help others.

10-19-2016, 06:13 AM   #21
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If anyone needs spare parts for a job like this I have a disassembled K-r - all major components. This resulted from my acquiring cheaply a K-r with a cracked mirror with the thought "how difficult is that to replace?". Well it's full disassembly actually to do the job properly, though I did wonder if it could be done adequately without disassembly, there's just a couple of plastic latches that would have to be overcome to remove the mirror and then the replacement would have to be secured somehow. Anyway I suddenly saw another K-r sold for parts - a botched diy reassembly. Got that, Luton camera repairs did the mirror box swap and also casing replace on my then main camera, another K-r, I sold the repaired k-r at a slight loss, and I still have all the pieces.
I'm UK btw.

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