From Redusers
“A little birdy just whispered something pretty remarkable into my ear. I cannot verify this AT ALL but rumor has it that Canon may be prepping to unveil a RAW or sRAW recording module for the 5D2, 7D, etc, which would record possibly via the CF card slot. Apparently they are being tested and used now.
Will post more details later if I get any. Don't know about framerates or RAW vs sRAW. And again, this is totally unconfirmed, from a single “high-placed” source.”
Read More: http://reduser.net/forum/…..
thanks Tom
cr
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71 Comments
look at a random sample of bokeh photo’s, if the sample is truely random, it won’t include a high % of photo’s with the subject 1ft away from the camera and background at infinity. now look at the other photo’s (the majority), and ask yourself if your eyes were where the camera was, would you see the scene the same way it looks in the photo? sure not. and even if the subject is 1 ft from your eyes, the moment you try to check if the background is blurred or not your eyes automatically change it’s focus. so human eye blurs rarely compared to camera lenses and when it does the blurred background is out of your attention. doctor your own thinking befoe doctoring others eyes.
assuming same bits per final pixel as in picture mode, just less pixels per frame and more frames per second, each 1080p frame takes 10 times less info than a 21MPix picture (5616×3744)/(1920×1080)
therefore, using dpreview numbers for the 5D2 as reference, 21MB of RAW data per 21MPix picture mean 2MB of RAW data per 1080p frame, so 62MB of RAW data per 1080p second at 30fps
that solves the first question: how much RAW video can I store in my memory card? with these linear calculations, just over 16 seconds per GB
and for the other question: is this camera even able to do this in theory? while writing RAW pictures on its buffer, the 5D2 is able to take 3.7fps; with the same 10x ratio as before, that means it would be able to take video in 1920×1080 resolution at up to 37fps, and in particular it should be able to take it at 30fps
what’s the problem? that buffer is too small for video: looking at the dpreview numbers, it looks like it is 256MB, able to write at more than 80MB/s
that would run out in 4 seconds
after that, even a really fast card will not be enough: after the buffer is full, on the 8 GB Lexar Pro 300x CF card they test in dpreview, they only manage 1.5 fps, so you could only get 15 fps 1080p video there: not enough
conclusion? attach a bigger, faster drive, and the 5D2 has the processing power and I/O performance to record RAW 1080p video at 30fps; I guess this, plus a firmware update, is what these rumors could come to
note 1: firmware update plus 600x superbig card is not enough, the file size limit of FAT32 would be a big pain
note 2: I don’t know which is the problem with 24p in the 5D2, so I don’t know if RAW should unlock this too
note 3: the only remaining thing is: how efficient is the row/column skipping process that these canon DSLRs follow when capturing video? if the whole sensor has to be read, and then most information is discarded, and there’s some performance inefficiencies in this, then my numbers about feasibility are useless
Batch processing?
I recently bought 7d and I get to admire what we can have in our hands in terms of technology these days. But I can surly see the virtues of having uncompressed files for the post work. In film making, all things aside, just the size of DSLR itself is revolutionary translating your ability to shoot at spaces never thought possible before. The key still is how well it can be mixed with 35 mm stock and for that the files maleability in post as wel as PL mount adapter for serious lenses will truly makeit a genuine film making tool. And if red can do it then I believe Canon can too. And I think they soon will.
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