Tips and trick for frame grabbing from video
Apr 09, 2015Apr 09, 2015TheOldManMost of the advanced DSLR cameras can shoot photos in fast series. EOS 1DC can shoot 12-14 photos/sec. The problem is that their shutter then often sounds like a machine-gun and tend to scare animals away. Shooing in video mode instead and you can get 24 - 50 frames (photos) per second - AND - it is completely soundless!
With a good camera and lens you can get frame grabs from the video. I'm using a Canon 1D C with shots 4K video ( 8 bit 4:2:2) internally to fast CF-cards. My main interest is photo and video of wildlife and I often have to shot in low light. The frame grabs will be 4096x2160 px witch is approx. 8.8 Mpx. That is often enough to print A3-A3+ copies.There are basically two ways of getting frame grabs:1. From a video file intended to be a film2. From a video file specifically filmed for getting frame grabs.Why frame grabs instead of normal photos?Most of the advanced DSLR cameras can shoot photos in fast series. EOS 1DC can shoot 12-14 photos/sec. The problem is that their shutter then often sounds like a machine-gun and tend to scare animals away. Shooing in video mode instead and you can get 24 - 50 frames (photos) per second - AND - it is completely soundless! When shooting for video you use shutter speeds from 1/25s to 1/50s (1/100s) and then it´s an obvious risk for bad sharpness due to motion (object).When shooting intentionally for frame grabs you can use whatever shutter speed you want (and the light admits), often shorter than above. This enhances chances to get sharp grabs. On the other hand - viewing such a video file as a film/video will often be an unpleasant experience because the video will "stutter" and not flow normally.Just before Christmas I received my Atomos Shogun 4K recorder and could start using the 4K ability of my Sony A7s.For the Sony camera I can use all of my Canon lenses with a Metabone adapter. The same goes for my Samyang VDSLR lenses.I hope to come back later with more frame grabs from A7s-Shogun. The Shogun saves 4K files in 1obit 4:2:2.There is an example at the bottom of this blog post.
Apr 09, 2015Apr 09, 2015TheOldMan
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Stag in rut -framegrab
Upload Date: Feb 28, 2015 12:25 PM
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EOS 1DC with EF 200-400mm/4 w.ext.1.4x
Framegrab from 4K-video 4096 x 2160 px Close |
focal length 560 mm. Aperture 5.6.
Shot before sunset with Canon EOS 1D C and Canon EF 200-400mm/4 L with build extender 1.4X. Shutter speed 1/50s and focal length 560 mm. Aperture 6.5.
Apr 09, 2015Apr 09, 2015TheOldMan
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Red deer buck in rut
Upload Date: Mar 7, 2015 01:20 PM
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Framegrab from 4K video shot with Canon EOS 1DC and EF 200-400mm/4.0 L with builtin extender 1.4X. Shot around sunset.
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focal length 560 mm. Aperture 6.5.
Shot as a test with Sony A7s in 4K (10 bit 4:2:2) to an Atomos Shogun recorder. Lens: Canon EF 135mm/2.0L. 1/50s and 2.8.Distance 70-80 m.
Apr 09, 2015Apr 09, 2015TheOldMan
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Garaget framegrab
Upload Date: Feb 28, 2015 11:52 AM
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Canon EOS 1D C with Canon EF 135mm/2.0
Framegrab from 4K-video 4096 x 2160 px Close |
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