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Thread: 16-50 sdm - A new lease of life

  1. #1
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    Smile 16-50 sdm - A new lease of life

    Ever since my 16-50 sdm died a year ago. I have not used it at all. Don't like to use manual focus. Thanks to fengwei who helped to disable the sdm, now my lens is back in action.

  2. #2

    Default Re: 16-50 sdm - A new lease of life

    Haha, thanks for the beer

    And now my 1650 focuses a lot faster than it focused with SDM. And I do suggest all guys who are using SDM lenses like 1650/50135 on your K5/K5IIK5IIs cameras, better convert them to non-SDM lenses, you'd love them even more

  3. #3
    Member jasonlel's Avatar
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    Quote Originally Posted by fengwei
    Haha, thanks for the beer

    And now my 1650 focuses a lot faster than it focused with SDM. And I do suggest all guys who are using SDM lenses like 1650/50135 on your K5/K5IIK5IIs cameras, better convert them to non-SDM lenses, you'd love them even more
    2 thumbs up!
    Nikon D700, Nikkor 20mm f2.8, 35mm/50mm f1.8G

  4. #4

    Default Re: 16-50 sdm - A new lease of life

    This morning I tried the lens under good light, man, its AF speed can compare w/ 18135 I think. It's almost instant from minimum to infinity

  5. #5
    Senior Member felixcat8888's Avatar
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    Default Re: 16-50 sdm - A new lease of life

    Quote Originally Posted by fengwei View Post
    This morning I tried the lens under good light, man, its AF speed can compare w/ 18135 I think. It's almost instant from minimum to infinity
    Can you do that to my 1650 too?
    Pentaxian for Life
    K1, KP, FA*28-70/2.8, FA31, 43 & FA77 Limiteds, K85/1.8, FA*200/2.8, A50/1.2



  6. #6
    Member jasonlel's Avatar
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    Quote Originally Posted by felixcat8888

    Can you do that to my 1650 too?
    Me too?
    Nikon D700, Nikkor 20mm f2.8, 35mm/50mm f1.8G

  7. #7

    Default Re: 16-50 sdm - A new lease of life

    Sure! 啤酒伺候

  8. #8
    Senior Member felixcat8888's Avatar
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    Default Re: 16-50 sdm - A new lease of life

    Quote Originally Posted by fengwei View Post
    Sure! 啤酒伺候
    Sui bian kekeke
    Pentaxian for Life
    K1, KP, FA*28-70/2.8, FA31, 43 & FA77 Limiteds, K85/1.8, FA*200/2.8, A50/1.2



  9. #9

    Default Re: 16-50 sdm - A new lease of life

    Is there quick shift still with the screwdrive?

  10. #10

    Default Re: 16-50 sdm - A new lease of life

    Quote Originally Posted by gtl1987 View Post
    Is there quick shift still with the screwdrive?
    Yes, works perfectly. Now I really love the 1650, just can't put it down today  I think it's gonna stay on my K5IIs more than the FA31 from now on.

  11. #11

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    Actually I dont really understand.
    Does it means that theres 2 motor built into the lens?
    One SDM
    One screw motor?

    I though theres only one motor for the lens AF?

  12. #12

    Default Re: 16-50 sdm - A new lease of life

    Quote Originally Posted by morganoh View Post
    Actually I dont really understand.
    Does it means that theres 2 motor built into the lens?
    One SDM
    One screw motor?

    I though theres only one motor for the lens AF?
    SDM is inside the lens, screw driven motor is inside the camera. You can use either one to do AF w/ some SDM lenses like DA* 1650/50135/200/300 and etc, but you can't use both together. When SDM is working, camera motor will be disabled/disconnected, when camera motor is working, SDM will be disabled.

    The firmware updating is to disable SDM motor so the camera would recognize the lens as non-SDM lens, so the camera motor will turn to drive the lens when doing AF.

  13. #13

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    So can I confirm that SDM is really slower than camera body motor?

  14. #14

    Default Re: 16-50 sdm - A new lease of life

    Is this 'enhancement' reversible? I do find the 16-50 AF faster on the K5IIs. But if the screw drive does boost the AF even faster, then its really worth to do this 'enhancement'.

  15. #15

    Default Re: 16-50 sdm - A new lease of life

    Quote Originally Posted by morganoh View Post
    So can I confirm that SDM is really slower than camera body motor?
    In this (DA*1650) case, yes, I can confirm that. I think SDM motor is a bit too weak to drive the lens element quickly, the acceleration and deceleration during AF movement are pretty slow and obvious. While with the camera AF motor the acceleration and deceleration are almost non exist. It's not super fast purely because Pentax' AF module and software are not there yet.

  16. #16

    Default Re: 16-50 sdm - A new lease of life

    Quote Originally Posted by Bridgerock View Post
    Is this 'enhancement' reversible? I do find the 16-50 AF faster on the K5IIs. But if the screw drive does boost the AF even faster, then its really worth to do this 'enhancement'.
    Yes, just write the original ROM file back to the lens, it'd go back to an SDM driven lens
    Last edited by fengwei; 12th January 2013 at 06:42 PM.

  17. #17

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    Quote Originally Posted by fengwei

    Yes, just write the original ROM file back to the lens, it'd go back to an SDM driven lens
    Just to verify that it still cannot be done through a K5? So will need your K7 to do the update.

  18. #18

    Default Re: 16-50 sdm - A new lease of life

    Quote Originally Posted by dualie View Post
    Just to verify that it still cannot be done through a K5? So will need your K7 to do the update.
    So far I don't know anyway to get to DEBUG mode on a K5. Have to use a K7/K20D/Km and etc.

  19. #19

    Default Re: 16-50 sdm - A new lease of life

    there is new update for K5 IIs?

  20. #20

    Default Re: 16-50 sdm - A new lease of life

    Quote Originally Posted by canbedone View Post
    there is new update for K5 IIs?
    No, but you can use other camera (K7, K20D, Km and etc) to convert the lens, then the lens would work on any Pentax dSLR camera (including K5IIs) as a non-SDM lens

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