[HN Gopher] DIY, 8mm film scanner Kotokino Mark IV
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       DIY, 8mm film scanner Kotokino Mark IV
        
       Author : noyesno
       Score  : 31 points
       Date   : 2024-08-01 19:42 UTC (3 hours ago)
        
 (HTM) web link (www.sabulo.com)
 (TXT) w3m dump (www.sabulo.com)
        
       | redundantly wrote:
       | I was hoping for a sample of the footage being captured, but I
       | don't see any on their blog.
        
         | hkchad wrote:
         | There's an embedded mkv file that I suspect most browsers won't
         | play inline but you can download it and play w/ VLC.
         | 
         | http://www.sabulo.com/sb/wp-content/uploads/2020/03/0001-026...
        
       | jshipc wrote:
       | Various sources list the Canon 1000D shutter life expectancy at
       | between 25,000 and 100,000 activations. If the 8mm film is 16
       | frames per second, then this setup should be able to capture
       | between 26 to 104 minutes of film before consuming the expected
       | lifespan of the camera shutter.
       | 
       | Edit: Changed math from 24 frames per second to 16 fps to reflect
       | the 8mm film fps standard playback speed of 16 fps.
        
         | actionfromafar wrote:
         | The article does not mention this, but many Canon (and I assume
         | other brands) have an option to use only the electronic
         | shutter. For a non-moving subject such as this, it's the
         | perfect option.
         | 
         | But it's a good caveat to consider when doing such a project.
        
         | Clamchop wrote:
         | Good point. More recent mirrorless interchangeable lens cameras
         | can disable the physical shutter and use only the electronic
         | shutter, which would relieve this problem.
        
         | choilive wrote:
         | The specific camera model doesn't seem very important its
         | probably whatever they had on hand - presumably you could just
         | replace it with a camera with an electronic shutter and as long
         | as it has the same remote shutter port you could take many
         | millions of exposures.
        
         | _Microft wrote:
         | From the article: _" To minimize jitter of the system, and to
         | enable 22 shots per minute, the mirror must be moved into the
         | permanent up position."_
         | 
         | This makes it sound like they are using an electronic shutter
         | instead which circumvents the lifetime issues.
        
           | throwaway22032 wrote:
           | The mirror being up likely refers to the viewfinder mirror. I
           | haven't used a DSLR, only mirrorless, but I wonder if that
           | could be independent of the shutter.
        
             | _Microft wrote:
             | That's exactly the mirror that gives (D)SLR's the R
             | ("reflex") in their name. It's in the path between sensor
             | and lens and redirects the image towards the view finder.
             | When taking a picture this mirror moves out of the way and
             | the image is projected on the film/sensor instead. The
             | advantage of that system is/was that the photographer can
             | preview the image as it will get captured.
        
               | throwaway22032 wrote:
               | Ah, so there's no shutter at all then? As in, the mirror
               | itself forms the shutter?
               | 
               | For some reason I figured there were both. Makes sense I
               | guess.
        
               | ginko wrote:
               | There is a separate shutter.
        
               | RobotToaster wrote:
               | No, in most* cameras there's still a shutter behind the
               | mirror, the mirror can't move that fast so would limit
               | the top shutter speed too much.
               | 
               | *The Ihagee Exa is the only one I know of that used a
               | mirror guillotine shutter.
        
         | cladopa wrote:
         | I have other canon cameras that could be used with the shutter
         | opened and digital acquisition with Magic Lantern via USB(with
         | hacks).
         | 
         | But today I believe it is much better to use Digital cameras
         | like the Raspberry Pi HQ cameras with good lenses. You don't
         | need hacks, and the sensors come from recent mobile phones
         | modules that have much better quality and technology than old
         | camera digital sensors.
        
         | throwaway22032 wrote:
         | I don't know about the Canon 1000D but almost all cameras I've
         | used recently have electronic shutters.
         | 
         | There is a rolling shutter penalty so you wouldn't want to use
         | it in the "real world" for moving subjects but if you
         | synchronise it properly (e.g. move one physical frame, take
         | photo, move one physical frame) and ensure that there is no
         | movement during the exposure then this shouldn't make a
         | difference.
         | 
         | Even the worst culprits like a 61MP mirrorless (huge overkill
         | for this task) with ~100ms readout could trivially keep up with
         | 22 shots per minute.
        
           | _Microft wrote:
           | They are advancing the film one frame at a time and are
           | taking static images. There's a switch getting actuated that
           | triggers image capture once the film has advanced. The first
           | video in the article has close-ups of the process.
        
         | google234123 wrote:
         | A mirrorless camera can probably be found used for 200$ so that
         | would be better
        
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