[HN Gopher] Using Lidar to Add Autofocus to a Manual Focus Lens ___________________________________________________________________ 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. ___________________________________________________________________ (page generated 2020-10-22 23:00 UTC)