major reasons for making panny better in video than oly

Started Jun 30, 2013 | Questions thread
ryan2007 Forum Pro • Posts: 12,001
Re: major reasons for making panny better in video than oly

AndyGM wrote:

j9300 wrote:

I was told that panny GF6 will be better than oly epl5 in video although they have same fps.

what makes the better quality in panny video compared to oly?

I experienced epl5 lose the focus frequently when shooting video. this does not happen in panny GF6??

Oh, a bunch of reasons:

- all m43 cameras have "rolling shutter" sensors, meaning they reads the image in lines, one after the other, top to bottom, so different parts of the image are captured at slightly different times. If the camera shakes during the capture, you get all sorts of horrible distortion, aka the Jello effect. The only way to stop this happening is to have physical Image Stabilisation, either optical in lens, or sensor shift in body. Only the EM5 and the EP5 can currently do sensor shift IS during video recording, all other Olympus m43 cameras do an attempt at "digital" IS which was just never going to work. All Oly m43 cameras since the EPL5 can activate the OIS in any Panny lens, which is the best option for video on the cheaper PENs.

- Panny cameras, with Panny lenses, correct for Chromatic Aberration in camera. This improves the perceived sharpness of the image. If there is software to do frame by frame CA correction in post production, its likely to be damn expensive.

- To get smooth looking video, you need to lock the shutter speed to half the frame rate, in other words for 30fps video the shutter speed should be as close to 1/60s as possible. This means that if there is changes in illumination, the camera should change the ISO and the aperture to get the right exposure in preference to changing the shutter speed. Olympus cameras lock the ISO at the start of the video, which means they have got less options for maintaining correct exposure without changing the shutter speed (for really good results on any camera you need to use a ND filter).

- Yes, their H.264 codec is probably far better than the Olympus one, I wouldn't be surprised if the Venus Engine image processor in the Lumix Gs is doing a large chunk of the work to compress the video, whereas the Olympus codec is mainly software.

This is called the 180 degree shutter rule.

The Panasonic GH-3 destroys Olympus for anything video related let alone still related. On the still image side Fuji X does better than both Olympus or Panasonic. Fuji not so good for video that matters.

Shutter speed is actually Double the frame rate not half. 30 FPS (frames per second) shutter is 1/60 to 1/80 tops (half would be 1/15). 24 FPS is 1/48 shutter, but cameras usually have 1/50th. PAL uses different settings than NTSC for Frame rates. You can do special effects with FPS rates as well at least with the GH-3, but fast motion or slow motion your audio is tied to that any will go along with video. That is why most use their own music over anything ambient/natural. For editing it is a good idea to get "room" sound just in case and that means you record the room and everyone and everything is quiet for a minute or two. For example you may have to turn off lights because of Hum or the air condition that kicks on and off.

You should have manual control like the Panasonic GH-3 has over shutter and aperture and be able to go full manual. The GH-3 has a option to lock frame rate.

You should also use fixed aperture lenses, the faster the better. If you zoom with a variable aperture lens you get a flicker because you are changing exposure while you video XYZ...whatever. If you have to do this it is better to start and stop and reset focal length, basically do not zoom.

Fuji would be 100 TIMES better if they would pay attention to the video side!

You still need a monopod or tripod with a fluid video head. You can not use a head meant for still work and get smooth video. It is best to use a tripod with a geared center column if you have to Crane during the shot or you have to hold all the weight of the camera etc and do it manually while not impossible, but it ain't easy.

You also may need a rig to help steady the shot. Image stabilization is different in a HDSLR vs a dedicated video camera. Actually the stabilization of the Fuji 55-200 is what I have seen and expect a dedicated video camera to work like. It is just obvious the stabilization is working.

I disagree about having to use a ND filter all the time. You don't use it indoors and even then only when needed.

You can look at Black Magic Design they have Two new video cameras with MFT's lens mounts but they will cost $$$$.

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