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Sri

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About Sri

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  • My cameras and kit
    gh4, eos 7d, etc
  1. By the way, when I chanced to see earlier posts, I would like to expressly state that in all my tests IS / VR was always OFF
  2. I faced similar issues with GH4; jarring motion / judder when panned at 25p. Test A: The situation seemed to get better (for good) - i meant lesser judder at 50p (of coarse the shutter speed had to be increase - Ts <= 1/00s) but the problem still remained. Test B: The next step was to enable the variable frame rate to 75fps and consequently I also set the shutter speed to 1/320 s (~ 1/4 times the frame length) and panned it slowly enough to reduce the judder and it did reduce the judder. Well, in the final edit I increased the speed to 200% of the original footage to get something decent (subjective). Conclusion: By the way, while test A produced a unacceptable video but contained the background audio; Test B produced an acceptable video with no audio (something that is stated to be common when VFR is ON). I believe this video judder is either a mechanical problem: Owing to the use of (slow) rolling shutter OR codec issue and I can't comprehend this. By the way EOS 7d with similar settings i.e.(Full HD 25p) produced no judder when panned at the same angular velocity! My work around: USE GH4 sparingly for tilt / pan. For a linear slide application it might still be useful as the frame traversed is not going to get amplified with distance as is with a pan, keeping the velocity invariant with respect to the distance. USE EOS 7D with glee:) Overall, I am still discovering the drawbacks of GH4 although I see some definitive advantages with it...Time for a serious upgrade by Panasonic / bug fix...
  3. I faced similar issues with GH4; jarring motion / judder when panned at 25p. Test A: The situation seemed to get better (for good) - i meant lesser judder at 50p (of coarse the shutter speed had to be increase - Ts <= 1/00s) but the problem still remained. Test B: The next step was to enable the variable frame rate to 75fps and consequently I also set the shutter speed to 1/320 s (~ 1/4 times the frame length) and panned it slowly enough to reduce the judder and it did reduce the judder. Well, in the final edit I increased the speed to 200% of the original footage to get something decent (subjective). Conclusion: By the way, while test A produced a unacceptable video but contained the background audio; Test B produced an acceptable video with no audio (something that is stated to be common when VFR is ON). I believe this video judder is either a mechanical problem: Owing to the use of (slow) rolling shutter OR codec issue and I can't comprehend this. By the way EOS 7d with similar settings i.e.(Full HD 25p) produced no judder when panned at the same angular velocity! My work around: USE GH4 sparingly for tilt / pan. For a linear slide application it might still be useful as the frame traversed is not going to get amplified with distance as is with a pan, keeping the velocity invariant with respect to the distance. USE EOS 7D with glee:) Overall, I am still discovering the drawbacks of GH4 although I see some definitive advantages with it...Time for a serious upgrade by Panasonic / bug fix...
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