[HN Gopher] Using Lidar to Add Autofocus to a Manual Focus Lens
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       Using Lidar to Add Autofocus to a Manual Focus Lens
        
       Author : giuliomagnifico
       Score  : 51 points
       Date   : 2020-10-22 08:57 UTC (14 hours ago)
        
 (HTM) web link (sonyaddict.com)
 (TXT) w3m dump (sonyaddict.com)
        
       | est31 wrote:
       | Those lights make it almost look like a SIGGRAPH presentation
       | video.
       | 
       | Big gotcha is probably that the LIDAR does not respect the object
       | tracking but instead focuses on what's in the center of the FOV.
       | The object tracking only moves the tracked object to the center,
       | bringing the tracked object out of focus when you walk around
       | while getting closer to the camera.
        
       | s1mon wrote:
       | To be clear, this is auto- _follow_ -focus for video, not
       | autofocus for stills. The post title is the same as the site, but
       | really you wouldn't bother with this for stills. Follow focus is
       | useful or essential for video production. On large shoots, there
       | is a person dedicated to twisting a large knob which usually has
       | white tape on it so the operator can write on marks for various
       | focus depths that the director wants to hit at different times in
       | the scene. Sometimes these follow focus systems are semi-
       | automated to allow for smooth controlled transitions from one
       | pre-rehearsed focus point to another.
       | 
       | The particular lens this is being demoed on is a 50mm f0.95,
       | which will have a very shallow depth of field. Any minor focus
       | error will be very apparent.
        
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       (page generated 2020-10-22 23:00 UTC)