GH2 Is 1080 24p at 120 frames per second possible on a DSLR camera & why isnt it around?

[moviemaykr]

Is 1080 24p at 120 frames per second possible on a DSLR camera & why isnt it around?

Just curious why this feature has not come about?

 

[wgzn]

i would guess due to bus and card speed limitations...

 

[Grunf]

I recon 24 fps at 120 fps is a bit hard to do.

 

[Ian-T]

I guess his question should have read "Is 120fps slowed down to 24fps possible with DSLR?" Twixtor for now! ;-)

 

[Phenixone]

Well if you google full HD 120fps, you see the Fuji HS10 (discontinued): Fuji HS10 Full HD 120fps The Burn - YouTube http://youtu.be/DL6dVrAQoo8
Also I have never heard of it before and have not ever tried it.

But for the cameras like the GH2, the bottleneck is the memory card speed. The other limitations are the CMOS refresh rate and the fact that they try to keep this kind of features for pro cameras (see Alexa for example)

 

[NoahK]

Also probably not a massive demand for this...

Noah

 

[kurth]

Noah- disagree - why is canon putting 640x480/120p on it's compact line ? I predict this will be the debut feature for the next gen cameras and I think canon will do it first -k

 

[David Jimerson]

120 fps at 24 fps base would be a slowdown of 80% -- or 20% speed of motion. I agree with Noah -- this is not something you'll see used on a regular basis. It's too slow.

 

[NoahK]

Noah- disagree - why is canon putting 640x480/120p on it's compact line ? I predict this will be the debut feature for the next gen cameras and I think canon will do it first -k

Clearly it's not a priority or you'd see it on a majority of DSLRs and high-end camcorders from Sony/Panasonic/Canon. It's technically difficult- to do it right is very fast ram and very fast sensor=opposite of a prosumer camcorder. That's why you see it on incredibly expensive specialty cameras like the Phantom and a bit on EPIC. But in order to get speed on the slower processors/sensors you have to drop the resolution way down to VGA size. Which is useless to prosumers. Or at least that's the research that the big co's clearly have gone with until now.

Noah

 

[William_Robinette]

You don't even see 120fps on high-end cameras from Sony and Panasonic. The Varicams still only go up to 60fps!

 

[dcloud]

not right now
thats a really high memory requirement. 120 frames of 1080p for 1 second is a lot to process.
perhaps when technology catches up well see cheaper specialty cams that do this.

 

[Camera Expert]

Speaking of high speed cameras with resolutions higher than SD, take a look at these:
http://www.megaspeedusa.com/
http://ts3cine.com/

The MegaSpeed X7 supposedly does 1920x1080 @ 1000 frames per second according to the specs.

 

[deltoidjohn]

It's not just the technical limitations stopping them - it's idiot consumers.

The GH2 is a consumer cam - if it had 120fps, most consumers would not know what to do with it. They would play it back straight from the camera without slowing it down in post and it would just end up as either 1080p24 or 720p60 when they play it on their TV.

If the slowdown was to actually occur in camera (ie record 120fps and set playback rate to 24fps) then there would be all sorts of calls to customer support from consumers wondering why the hell they can't get their video of little Billy blowing out his birthday candles to playback at regular speed.

The amount of users who would confrom the files to 24p, for the specific purpose of slow-motion when they desire it, is only a tiny proportion of the small percentage of users who own the GH2 primarily for video.

 

[Kin Lau]

We're getting closer tho, check out the new JVC GC-PX10, http://resources.jvc.ca/en/gc-px10

It'll do 300fps @ 640x480 for 3hrs or 1080/60p @ 36Mbps. The 300fps is recording as a 60p stream, so it plays back in slow-mo.

If you can do 1080/60p, and 720/120p is also possible, since they're about the same bitrate.