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07-23-2020, 10:03 PM   #1
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Tamron 28-75f/2.8 issue with K1

Hi, I have a K1 and Tamron lenses 17-35, 28-75, & 70-200. I am having an issue with the 28-75 removing it from the camera. It takes several tries of depressing the release button before the lens is able to be unmounted. I do not have this problem with the other Tamron lenses, nor my crop sensor lenses. Any insights would be appreciated.

07-24-2020, 10:34 AM   #2
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QuoteOriginally posted by LB1103 Quote
Hi, I have a K1 and Tamron lenses 17-35, 28-75, & 70-200. I am having an issue with the 28-75 removing it from the camera. It takes several tries of depressing the release button before the lens is able to be unmounted. I do not have this problem with the other Tamron lenses, nor my crop sensor lenses. Any insights would be appreciated.
I wonder if the bayonet is bend slightly, or wasn't machined precisely for the mount? If other lenses don't have that issue, it points to an issue with this particular copy of the 28-75
07-24-2020, 06:49 PM   #3
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QuoteOriginally posted by awscreo Quote
I wonder if the bayonet is bend slightly, or wasn't machined precisely for the mount? If other lenses don't have that issue, it points to an issue with this particular copy of the 28-75
Thanks, I was thinking something along the same line but wanted to check if there was a known issue. I purchased this last year from KEH, other than the stubborn mount, the lens is great.
07-24-2020, 06:54 PM   #4
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QuoteOriginally posted by LB1103 Quote
Thanks, I was thinking something along the same line but wanted to check if there was a known issue. I purchased this last year from KEH, other than the stubborn mount, the lens is great.
Are there any visual signs that the bayonet is different from the other lenses you have?

07-24-2020, 08:51 PM   #5
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QuoteOriginally posted by awscreo Quote
Are there any visual signs that the bayonet is different from the other lenses you have?
None that I can see. A couple of screw placements differences. I just tried it again, if I take my time when mounting it and keep it at 75mm, it seemed a little bit easier to get off, but that kind of defeats the purpose of being able to change lenses quickly.
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