Mark Keefer's Recent Activity

  1. Mark Keefer replied to the thread Sony/Minolta pictures of the week | 2 December.

    Results using the DIY Focus ring lever, perhaps the lever is not long enough, but on the SIGMA 150-600 C it makes little difference, not...

    Dec 7, 2018 at 7:11 PM
  2. Mark Keefer attached a file to the thread Sony/Minolta pictures of the week | 2 December.

    I also went to the hardware store and picked up a hose clamp and and some hardware, used my drill press and some black lacquer paint I...

    Focus Ring Lever - Canon x 1500-1-4.jpg Focus Ring Lever - Canon x 1500-1-5.jpg Focus Ring Lever - Canon x 1500-1-6.jpg Focus Ring Lever - Canon x 1500-47829-2.jpg Dec 7, 2018 at 1:06 AM
  3. Mark Keefer attached a file to the thread Sony/Minolta pictures of the week | 2 December.

    It is a difficult task. Of course putting the lens in manual mode and using Focus Peaking it makes it a bit easier and there is also...

    Deer Tall Grass 1200mm SNY 2x teleconverter SNYx 1500-02383.jpg Dec 7, 2018 at 12:56 AM
  4. Mark Keefer liked Mike Dale's post in the thread Monday in Nature, 3 December 2018.

    We had a brief snow shower this morning so here's a Snowbird. Dark-eyed Junco [IMG]

    Dec 6, 2018 at 6:49 PM
  5. Mark Keefer replied to the thread Sony/Minolta pictures of the week | 2 December.

    Thanks. Yes it was. Hand held with the adaptor, a 2x tele converter and the 150-600mm lens, manual focus on that ridiculously skinny...

    Dec 6, 2018 at 11:49 AM
  6. Mark Keefer attached a file to the thread Sony/Minolta pictures of the week | 2 December.

    1200mm [ATTACH]

    Deer Tyler PA x 1500-02023.jpg Dec 5, 2018 at 8:19 PM
  7. Mark Keefer replied to the thread I updated firmware on Sigma 150-600mm C to version 2.0 problem.

    I have have an update, I took the Canon 5D MK IV out with the SIGMA 1.4x EX DG Tele converter and the SIGMA 150-600mm Contemporary and...

    Dec 5, 2018 at 5:28 PM
  8. Mark Keefer replied to the thread I updated firmware on Sigma 150-600mm C to version 2.0 problem.

    Possibly the Canon, but I see no way to roll back the lens.

    Dec 5, 2018 at 5:16 PM
  9. Mark Keefer attached a file to the thread Monday in Nature, 3 December 2018.

    [ATTACH]

    Deer Tyler PA x 1000-01981.jpg Dec 5, 2018 at 10:26 AM
  10. Mark Keefer replied to the thread It is what we've known all along.

    Perhaps I should rephrase that and add, depends on how large you are printing. There comes a point when shooting people without good...

    Dec 5, 2018 at 4:14 AM
  11. Mark Keefer liked Uhooru's post in the thread It is what we've known all along.

    [IMG] In the few portrait shoots I've done, I was surprised how amazing the sharpness and quality of images when properly using studio...

    Dec 5, 2018 at 3:31 AM
  12. Mark Keefer replied to the thread I updated firmware on Sigma 150-600mm C to version 2.0 problem.

    Just tested it with the SIGMA 1.4x EX DG Tele converter, seems any focus point focusing above F/8 has been thoroughly shut down. Very...

    Dec 5, 2018 at 2:13 AM
  13. Mark Keefer attached a file to the thread I updated firmware on Sigma 150-600mm C to version 2.0 problem.

    And I did use Optimization Pro v1.4.1 [ATTACH]

    Sigma Opt Pro 1 4 1.JPG Dec 5, 2018 at 1:37 AM
  14. Mark Keefer posted a new thread.

    I updated firmware on Sigma 150-600mm C to version 2.0 problem

    I updated to the latest firmware v 2.0 on the SIGMA 150-600mm Contemporary, the lens works great directly mounted to my Canon 5D MK IV....

    SIGMA UPDATE.JPG

    Forum: Canon EOS

    Dec 5, 2018 at 12:55 AM
  15. Mark Keefer liked wgpinc's post in the thread Sony/Minolta pictures of the week | 2 December.

    Sony a6000 / Sony/Zeiss 16-70mm [ATTACH]

    DSC01579rs.jpg Dec 4, 2018 at 11:28 PM