Can everything be in focus in a movie?

Discussion in 'Computer Science & Culture' started by Syzygys, Mar 29, 2010.

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  1. John99 Banned Banned

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    yeas, 'lose focus'.

    do you have 20\20 vision? the distance is always in focus, just the objects get smaller. so small they disappear so i cannot say that they are going out of focus though. just too small to detect. with this comes diminished capctiy to discern detail. still, dont think that is 'out of focus'. otoh, objects too close to the eye do go out of focus.
     
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  3. MacGyver1968 Fixin' Shit that Ain't Broke Valued Senior Member

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    I wonder what porn would look like in 3D....would you have to duck during the "money shot" ?

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  5. phlogistician Banned Banned

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    John, you aren't very bright, are you?

    A lens can only focus for one distance. The lens in your eye is no different.

    Oh, and another thing, if you focus on an object close to you, you'll see two copies of distant objects, due to parallax. Both with be out of focus.
     
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  7. Syzygys As a mother, I am telling you Valued Senior Member

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    I was thinking the director actually could fix the unfocused problem in average films. If you put the camera far away from both characters, then zoom in on them their difference (to each other) compared to the camera makes both faces in focus, thus problem solved.
     
  8. John99 Banned Banned

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    no, i am dim and dull.

    You are using focused too much on a camera lens and euating it as an exact replica of the human eye. This is a limitation. I am telling you that for me objecrt at a distance DO NOT go out of focus.
     
    Last edited: Mar 29, 2010
  9. Syzygys As a mother, I am telling you Valued Senior Member

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    It is also called the hawkeye.

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    Predators can focus down on small prey and see their smallest movements. They have special eyes...

    Hey, looking up how a hawk's eye works, I found the answer how the tennis ball computer judge works: (I always wondered about that)

    http://en.wikipedia.org/wiki/Hawk_Eye
     
  10. Blindman Valued Senior Member

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    Must say I am always surprised at peoples ignorance.

    Human vision has a small depth of field. That is the distance in focus. It is hard for a human to perceive an object that is out of focus as when attention moves from one object to the next the lens of the human eye changes shape to adjust the focus. It is part of our depth perception. Not only parallax but the tension on the lens is used by our brains to calculate distance.

    This is a problem in modern 3D filming.
    One: Directors do not have much experience in the field and will use techniques not suitied to 3D.

    Two: When watching a 3D film the human brain will attempt to change focus when moving attention to a background or foreground. Because the focal plane is set by the camera recording's projected to the screen, our brain falters and the allusion is disrupted.

    Three: Good 3D should have long depth of field. Modern CCD's have very high ISO's and there is no excuse for low f stops (open aperture).

    Four: CGI imaging only gets its depth of field as a post effect. A modern rendering engine simulates a pin hole camera and does not have focus problems. Software is designed to simulate the lens used when recording live action to manipulate the depth buffer information in a CGI image to match the filmed image.

    We have a long way to go with modern 3D film making. Avatar is high tech but but still an infantile use of the 3D tech.
     
  11. visceral_instinct Monkey see, monkey denigrate Valued Senior Member

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    Maybe it was for emotional effect? Tunnel vision happens during excitement or stress. Maybe it was meant to make you feel, subtly, a little endangered/overexcited??

    Just my 2 cents..
     
  12. phlogistician Banned Banned

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    Oh dear, you know nothing about optics. At high zoom, focussing gets more specific to distance, not more tolerant of differences. You'd know this if you'd been to sniper school and used scope parallax to estimate range to target.
     
  13. spidergoat Valued Senior Member

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    no, they can't
     
  14. Syzygys As a mother, I am telling you Valued Senior Member

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    Talk for yourself only, but I agree. Now let's see if you are one...

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    Hate to break it to you, but the topic of this thread isn't 3D and not even HD. I brought up Avatar as an example of a CGI effect and not because it is 3D. The 3D discussion came up later as a comparison about people's acceptance/preferance in the future.
    So your next 3 points although might be true, are offtopic.

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    We already dicsussed this. So 1 moot and 3 offtopic points for you, how is that for ignorant??? Care to try again?

    By the way you called people ignorant on a highly technical and not so obvious issue....

    But they could... By the way, thanks for the detailed response....
     
  15. John99 Banned Banned

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    What do you mean 'they can't'?

    What they are doing in a 3d scene is 'simulating' a camera lens. They are not simulating what human vision would do.
     
  16. spidergoat Valued Senior Member

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    No director would want to rob themselves of that tool which assists the craft of storytelling. It's an unreasonable demand.
     
  17. phlogistician Banned Banned

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    A lens is a lens. While the human eye can adjust it's focal length, it can still only focus one distance at a time.

    Your subjective experience is clearly flawed, basically, you fool yourself, and don't understand what you are seeing. That's rather pathetic, John.
     
  18. stateofmind seeker of lies Valued Senior Member

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    It wouldn't look right in most situations to have everything in focus. It would look like an undergraduate graphic arts major made it. There's a reason Davinci painted the mountains in the mona lisa a little fuzzy and sleightly bluish.
     
  19. phlogistician Banned Banned

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    'Avatar' was a mix of CGI and real life cinematography. Care to be more specific with your ramblings?

    If CGI is to mix seemlessly with footage taken from real life, it has to match real world limitations, or are you too dim too see that?
     
  20. phlogistician Banned Banned

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    No they can't. Go back to school.
     
  21. Syzygys As a mother, I am telling you Valued Senior Member

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    Yes, and the reason is that he was lazy.

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    Why a movie about giant blue catpeople has to look realistic???
     
  22. stateofmind seeker of lies Valued Senior Member

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    I guess you never tried to draw or paint a realistic picture before... or if you did you didn't get very far.
     
  23. stateofmind seeker of lies Valued Senior Member

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    Someone correct me if I'm wrong but if everything in a shot was in focus, particularly in a shot with a lot of depth, everything would look like it was in the foreground and the illusion of things being far away in the distance would be replaced with the illusion that those same things are literally tiny and close to the observer.
     
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