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06-10-2012, 01:28 AM   #1
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Why is my 40mm xs so tight on my K-01?

I post below problem that I experience and am unable to find a relevant thread.

I bought the K-01 + 40mm xs together. I love the 'little bugger' for its IQ and my wife loves the camera for its neat design and great IQ. However I found that the 40mm xs fits a little bit too tightly on the K-01. It is difficult to lock the lens till the AF is properly coupled and I would like to improve this. When I install the lens and cannot lock it perfectly, I can use it MF but the AF is unoperable. At the first time I thought that the 40mm xs ws faulty, but it worked perfectly on the K-7.

- On the K-01, the 40mm xs is very tight to lock and it is difficult to reach the final 'click' (locking the lens AF). I tried my FA31mm and DA18-250mm and they both lock easily very nicely.

- On the K-7, the DA40mm xs locks very nicely. Like all my other lenses.

The only problem is the DA40mm xs on the K-01.

Has anyone experience this problem? Has anyone a suggestion to improve the issue?

Thank you in advance for your input....

06-10-2012, 01:55 AM   #2
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400mm xs ? I was all over this thread for a moment
06-10-2012, 02:59 AM   #3
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I haven't noticed any differences between the lens detente of the K-5, K10D, K-01 or P30T with any lens I own. What you are describing seems rather odd given the lack of problem with any other combination.
Just remember to lock it in good and tight and move on?
06-10-2012, 03:07 AM   #4
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QuoteOriginally posted by Frogfish Quote
400mm xs ? I was all over this thread for a moment


Not just me then

06-10-2012, 03:50 AM   #5
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I suspect we all noticed that. It's just pointless to pick on a simple typo.
06-10-2012, 05:01 AM   #6
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QuoteOriginally posted by Sandy Hancock Quote
I suspect we all noticed that. It's just pointless to pick on a simple typo.
Not if you have a sense of humour. Of course some people can't take a joke regardless.
06-10-2012, 05:03 AM   #7
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I have an extremely keen sense of humour.
It's only funny if it's not stupidly obvious.
06-10-2012, 05:08 AM - 2 Likes   #8
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I should have added supercilious wannabe mods too.

06-10-2012, 07:10 AM   #9
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The typo grabs eyeballs.
The grabbed eyeballs mock.
The question gets disregarded.

I use cheap US$8-per-set PK macro tubes for many purposes. One purpose is to check how lenses mount. It's like an inside view (from the camera outward) of the lens-mount. I can see where bayonet flags and mount lugs interact and maybe conflict. Whenever I have a lens that tens to jam on the camera, I stick it on the macro-tube section and look for causes. Try it.
06-10-2012, 08:03 AM   #10
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after loling at the replies, i think i shall reply the TS

I believe its just a simple matter of physics. the 40mm xs is smaller and harder to grip, its slippery grooves doesnt help either, thus as compared to bigger lenses, it seems harder. think of it as rolling dough with thin and thick pins.

another thing i noticed is that the mounting surface of the 40xs is that it seems coarser. smooth still yes, but it seems different compared to other pentax lenses, which have shinier and smoother mounts. but that aside, its not a problem with light leaks and whatever, just a different mount material (which is think is aluminium btw)
06-10-2012, 08:10 AM   #11
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I've had a similar experience with my DA40/2.8 Ltd. that I bought with my K-01 (rather than the XS). That is not the only lens I own that mounts so tightly on my K-01.

I once broke the "A" locking pin on a Vivitar 105/2.5 Macro dismounting it from a K10D. That lens had the same tight mounting issue on that camera. I inadvertently had gripped the lens by the aperture ring as I exerted the force necessary to turn it off. (Thankfully, Eric transplanted a pin from a cheap Viv lens I bought on eBay just to get the pin).

Last edited by monochrome; 06-10-2012 at 10:49 AM.
06-10-2012, 08:36 AM   #12
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QuoteOriginally posted by monochrome Quote
I've had a similar experience with my DA40/2.8 Ltd.
Likewise but on the k-5. The lens was so hard to turn I thought there was something wrong with it. After a few dozen times putting it on and off it seems to have loosened up to be normal. I assumed it was just a tighter tolerance with that lens. Maybe it just wore down enough metal to work though I do not see any scratches on the lens mount.
06-10-2012, 10:49 AM   #13
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QuoteOriginally posted by jatrax Quote
Likewise but on the k-5
Thanks. I felt the same would eventually happen.
06-10-2012, 10:23 PM   #14
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Original Poster
Thanks for all the useful feedback. I cannot try right now RioRico's tip, but will do as soon as possible.

In my case, the 40mm xs fits very nicely (and not tightly) on the K-7, but not the K-01. I will check carefully the surface of the lens (camera side).

Last edited by hcc; 06-11-2012 at 01:44 AM.
06-11-2012, 10:27 PM   #15
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great solution, to avoid, in future, a problem we both had, in the past
(lens sticking to camera, a k-01 in my case)
and the 'macro-tubes' are under $10 on flea-bay
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