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Forum: Troubleshooting and Beginner Help 05-07-2017, 10:53 PM  
K mount Adapter won't lock with Pentax FA 80-200
Posted By ohaya
Replies: 4
Views: 1,753
I've taking a more detailed look at the adapter, and I have a guess about what might be wrong.

When I try to mount the lens and turn it, at one point, I can see that silver knob move, very slightly. I think that is when the lock pin on the mount is entering the lock hole on the lens mount.

But then I can keep on turning the lens and I can see the know move slightly again.

I think that what is happening at that point is that the lock pin is coming out of the hole.

Looking at the pin more closely, the way that it is designed is that at the tip, it is slightly tapered, so I think that what is happening is that the pin is entering the hole on the lens mount (the tapered part of the pin), but the diameter of the body of the pin is (I am guessing) too large, so the pin cannot enter the hole completely.

Either that, or the tapered area of the pin is too long (i.e., it should be a smaller taper), so no non-tapered part of the pin "catches" on the hole, so it doesn't lock the lens.

---------- Post added 05-07-17 at 11:18 PM ----------




I just found I had another brand adapter, a Fotodiox, and I tried it with the same lens and it locks perfectly.

I checked the lock pin on the Fotodiox adapter and it is NOT tapered, so I think that that (the tapering) is the problem with the other adapter I have.
Forum: Troubleshooting and Beginner Help 05-07-2017, 03:23 PM  
K mount Adapter won't lock with Pentax FA 80-200
Posted By ohaya
Replies: 4
Views: 1,753
Hi,

I recently received a K-mount adapter (New PK-M4/3 Adapter Ring for Pentax PK/K Lens To Micro 4/3 Olympus Panasonic M43 | eBay) and it works with most of my Pentax and K-mount lenses, except for a Pentax FA 80-200mm lens. That lens will not lock onto the mount.

I was looking at the lens, which has a plastic mount, and there is a small hole for the locking, so I'm not quite sure why this is a problem. Is this a known problem with this lens, or with FA mount in general?

Is there a way to get it to work? I've ordered another, different adapter to try, but it'll be awhile before it gets here.

Thanks,
Jim

EDIT: Here are pictures of the lens mount and the adapter:

This is the mound end of the Pentax lens. The hole where the locking pin is supposed to fall into is circled in red:




This is the adapter mount end. The locking pin is circled in red:

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