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Rhythmic gymnastics team show

Started Nov 18, 2016 | Photos thread
VisualFX
VisualFX Senior Member • Posts: 1,241
Re: Rhythmic gymnastics team show

otto k wrote:

Things to consider when comparing stills and video af performance

  1. Video does not suffer from issues related to delay between af measurement and shutter actually closing and opening and closing - in video it has already taken the image
  2. In video the aperture is already at taking value, in stills it focuses wide open (for accuracy) and then stops down to taking aperture - another delay and possible focus shift. Sony does caf at taking aperture to speed it up and people are complaining left and right about that.
  3. In video there is no blackout - it's not just us who cannot see anything while exposure happens - there is no af data during blackout as well.

Off topic but, some of these problems will be solved by global shutters and that will enable much better af, especially in caf modes.

Video suffers from rolling shutter. I would never use a low-quality 4k video mode and extract a still from it, just because i needed to capture fast action. This should be done properly with a physical shutter. There are still too many disadvantages of electronic shutters.

http://www.red.com/learn/red-101/global-rolling-shutter

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