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07-15-2018, 08:16 PM   #1
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Tammy 70-200 locked on a K-1

First, if there is a better forum to move this please do mods...

Question for those who use a K-1 and a Tammy 70-200. Has anyone had this lens lock on your K-1 (or any other body)? I went to do some night shots of a lit up funky illuminated bridge and had the 70-200 on and realized I needed something shorter, but the lens locked and wouldn't come off. I used my backup camera and then called it a night. After I got home, I was able to get it off and then it stuck again. I've tried mounting it and taking it off probably 20 times with no issue. I can only assume temp & humidity as to why it wouldn't come off (it's not a weather sealed lens). This is the older F/2.8 DI LD (IF) Macro version. Bought used a few years ago.. Anyone ran into this before?

07-15-2018, 08:38 PM   #2
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I've had mine out in all kinds of weather, hot, cold, humid, dry, never locked up on my KS-2 nor K30 before it. I can't imagine our mounts are much different. Is your autofocus pin retracting all the way?
07-15-2018, 08:49 PM   #3
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unknown. Once the combo set accumulated to the AC & lower humidity indoors, I was not able to replicate the locking up. Therefore I can only conclude it was environmental.

---------- Post added 07-15-18 at 08:50 PM ----------

unknown. Once the camera set in the AC environment is was used to, the lens unlocked as normal several times.
07-15-2018, 10:18 PM - 1 Like   #4
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Check that all the screws are tight. Temperature changes and stress cycles from normal use can loosen screws with time, unless they have some kind of thread locker/pressure washer/locking nut. I've had loose screw heads gotten stuck on opposing cavities because of that. Maybe this is your case, and depending on the temperature and/or position things either work or don't.
Another thing to consider is that cold fingers hurt and can't exert so much force as when they're warm, so this could be the case in connection with the aforementioned or too tight tolerances.



07-15-2018, 10:25 PM   #5
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Let me know how it goes. If none of the above is the culprit, we can discard these posibilities and think of others.

07-15-2018, 11:03 PM   #6
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I had mine for over three years on my K-5 and K-1 cameras without any such issue. I recall that it was an easy lens to mount and remove and without any "play" when mounted.
07-16-2018, 02:18 AM   #7
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I have used the Tamron 70-200, same version as yours, on my K-1 for the past two years and never had a mounting problem of any sort. The mounting has always been very smooth, as good as any other lens I have used on the K-1. Thus no suggestions. I suspect this is a rarely encountered problem. Please let us know the outcome.
07-16-2018, 04:29 AM   #8
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after sitting inside for about 10 minutes. the lens let go and I could take it ff as normal. Mounted it about 20 times with no issues. Guess it was the humidity.

07-16-2018, 04:42 AM   #9
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If the humidity is such a bit problem maybe the mounts on your camera and/or lens are quite dirty and need some cleaning. Water on organic dirt might cause a tight mount to stick together. Just an assumption that might be of some help.
07-16-2018, 07:51 AM   #10
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Yes, dew could be the culprit, too.

07-16-2018, 09:46 AM   #11
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It could be just expansion/contraction of the metal due to the hot/cold environments like you have said.
07-16-2018, 10:00 AM   #12
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I have used Tammy 70-200 with K-1 and K-S2 without such problems. However, I had no opportunity to expose such lens/camera combo to violent changes in temperature and humidity. The only strange behaviour of the lens I noticed is erratic (actually non-working) AF in Live View when mounted on K-1. I use OVF only so it did not bother me much.
07-16-2018, 11:44 PM   #13
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QuoteOriginally posted by pentageek Quote
The only strange behaviour of the lens I noticed is erratic (actually non-working) AF in Live View when mounted on K-1. I use OVF only so it did not bother me much.
That is normal according to Tamron! Take a look if you're interested at my older post here;
URGENT: Feedback from Tamron 70-200/f2.8 users NEEDED! - Page 3 - PentaxForums.com
07-17-2018, 10:46 AM   #14
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QuoteOriginally posted by redpit Quote
That is normal according to Tamron!
Looks like these problems were not just several cases among thousands of lenses sold. Thanks for info.
07-17-2018, 05:01 PM   #15
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I have had my Tamron 70-200 for several years. I have used it in all kinds of weather conditions. Even in the conservatory during the butterfly exhibit when humidity is 80%. I have never had an issue taking the lens on or off. It has been used on my K10D, K3, K50, and even my K-01. Hopefully it is just an isolated event. I will say that Tamron 70-200 has never worked in Liveview on any of my camera bodies. I had a copy of the Sigma 70-200 OS HSM and that really did not work in liveview either. So it is not just a Tamron issue there.
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