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08-03-2016, 07:51 PM   #1
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120 -400 mm Sigma not working on K-1 , BUT works on my old K-3.

My sigma 120-400 will not work on my K-1, but it does works fine on the K-3. The camera will not do anything with that lens attached.
PLease help .

08-03-2016, 08:50 PM   #2
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See my reply here:
https://www.pentaxforums.com/forums/190-pentax-k-1/319937-k-1-troubleshooting...ml#post3730662

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08-03-2016, 09:08 PM   #3
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I own the 135-400mm Sigma, it doesn't have a problem.
08-04-2016, 05:28 PM - 1 Like   #4
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Just had my 120-400 HSM updated by Sigma Canada. They swapped the mount and updated the software on the lens control board but it still doesn't work on my K-1. The camera locks up as soon as it is turned on and the battery has to be pulled to reset the body. If/when they have a software fix that works I will send the lens back to Sigma again.

08-04-2016, 07:09 PM   #5
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120-400mm Sigma is not working on K-1 BUT works great on K-3 ?

Thanks , so its a brick for now .That's not a good news .
08-04-2016, 07:17 PM   #6
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Check the thread I made after doing some more in depth testing with a friend. Taping over the HSM contacts on the lens allowed it to work properly in manual focus mode with auto aperture control.
08-04-2016, 07:34 PM   #7
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120-400mm Sigma is not working on K-1 BUT works great on K-3 ?

Thank you I'll try that .
10-05-2016, 07:49 PM   #8
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To follow up my 120-400 went back to Sigma a second time, they updated the board and now the autofocus works. The fit of the new mount to the body is a bit sloppier than it was with the original mount but otherwise things worked out alright. Even though the invoice for the original repair had a line item for re-chipping the lens apparently it didn't happen.

10-06-2016, 08:36 AM   #9
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Thank you , I sent my lens 120-400 mm to Sigma yesterday, I'm hoping that they can do something to make it work on my K-1 .
11-06-2016, 05:21 PM - 1 Like   #10
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My sigma 120-400 IS FIXED , send it to Sigma they replace the board and mount .Thank you Sigma
06-05-2017, 12:27 PM   #11
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QuoteOriginally posted by Steinback Quote
Just had my 120-400 HSM updated by Sigma Canada. They swapped the mount and updated the software on the lens control board but it still doesn't work on my K-1. The camera locks up as soon as it is turned on and the battery has to be pulled to reset the body. If/when they have a software fix that works I will send the lens back to Sigma again.

I recently had mine updated with a new mount and firmware and can say it still locks up the K-1 as soon as you take a picture, it's endlessly showing the write to card light on, until you pull the battery. I hope Sigma know the new FW does not work.
06-05-2017, 08:00 PM   #12
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Send the lens to Sigma a second time. After the second trip in and a board swap my lens works. It seems like Sigma doesn't have a K1 to test on so they try one fix, send the lens back, then do a different fix that actually works on the second trip.
07-25-2017, 11:24 AM   #13
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QuoteOriginally posted by Steinback Quote
Send the lens to Sigma a second time. After the second trip in and a board swap my lens works. It seems like Sigma doesn't have a K1 to test on so they try one fix, send the lens back, then do a different fix that actually works on the second trip.
Thanks
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