Gear Talk > EOS Bodies - For Video

Videos and AutoFocus

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Leadfingers:
Magic Lantern has a feature where you can pick a section and it will magnify it 5x in the corner of your LiveView screen, and surround that with a green border when it's focused.  It's a very poor man's solution.

For the moment, I subscribe to the school of thought that there's enough CPU power in the universe that we should be able to compute autofocus in something the size of a camera.  I'm just hoping Canon is up to snuff.

Mt Spokane Photography:
The main advantage of a mirrorless camera is that AF for video is practical.  Contrast detect AF is very slow for large sensors, but easy for very small ones as in camcorders.  This is due to the huge depth of field and only a few lens focus positions.

We see lots of research and patents, but so far, nothing practical for a traditional DSLR.    Thats why I'm not excited about DSLR video, I do not have the inclination to fool around with manual focus, even if I could see well enough to do it.

AF is of no importance to Movie makers, its not accurate enough.  They have developed a system for manual focus and it gives them what they want.  Thats why the HDDSLR is popular for budget film makers, low cost, high quality, and they can adapt cinema quality lenses if they need them, or use the relatively low cost Canon lenses, at least for 35mm and longer.

All this refinement is totally lost on me, I'll not be making any movies.  My grandson, however, may indeed be filming movies, he is in college now and has written, directed, and filmed his work.  I certainly encourage him and others to learn.

Mt Spokane Photography:

--- Quote from: Leadfingers on February 22, 2012, 07:45:38 PM ---
For the moment, I subscribe to the school of thought that there's enough CPU power in the universe that we should be able to compute autofocus in something the size of a camera.  I'm just hoping Canon is up to snuff.

--- End quote ---

The problem with a camera computer is power and heat.  Progress is being made, but not so much that it really makes a lot of difference.  A super powerful 8 core processor might use up a battery in 5 minutes or less, if it did not cook everything first.

psolberg:

--- Quote from: Mt Spokane Photography on February 22, 2012, 07:48:54 PM ---The main advantage of a mirrorless camera is that AF for video is practical.  Contrast detect AF is very slow for large sensors, but easy for very small ones as in camcorders.  This is due to the huge depth of field and only a few lens focus positions.

We see lots of research and patents, but so far, nothing practical for a traditional DSLR.    Thats why I'm not excited about DSLR video, I do not have the inclination to fool around with manual focus, even if I could see well enough to do it.

AF is of no importance to Movie makers, its not accurate enough.  They have developed a system for manual focus and it gives them what they want.  Thats why the HDDSLR is popular for budget film makers, low cost, high quality, and they can adapt cinema quality lenses if they need them, or use the relatively low cost Canon lenses, at least for 35mm and longer.

All this refinement is totally lost on me, I'll not be making any movies.  My grandson, however, may indeed be filming movies, he is in college now and has written, directed, and filmed his work.  I certainly encourage him and others to learn.

--- End quote ---

you know how I know a film was shot with a DSLR...because half the time they are out of focus....so yeah. bring it on. panasonic's m4/3s cameras use contrast detect that is as fast as phase detect.

Leadfingers:
With respect, Mt Spokane, I stand by my position.  There are phones coming out this quarter based on nVidia's Tegra3 quad-core chip.  If there's room in a phone for that, then there's certainly room for similar power in a camera.

ESPECIALLY in the larger SLR's that have multiple CPU's and card slots. 

I'm passionate about this because I split time between photo and video and can't afford two separate cameras.  I totally get the old school mentality that scorns the use of an SLR for video.  But it's a new world...and none of our kids are going to make those kinds of distinctions...

:O

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