DIY, 8mm film scanner Kotokino Mark IV (2020)

Post by actionfromafar » Fri, Aug 02, 2024, 6:44 PM UTC

smogcutter wrote: post #30

actionfromafar wrote: post #26

Earlier quoted context omitted.

I think (some? most?) motion picture cameras used a rotating mirror for shutter.

Correct, it’s like a mirrored fan blade and rotates continuously. Ironically, with mirror reflex system what you see through the finder are precisely the moments not captured on film. Very quick events, muzzle flashes for example, can be missed entirely. Notably, some Bolex cameras (and others?) used a beam splitter system where you do see what the film sees, with no flicker from the shutter. The tradeoff is a dimmer…

Post by snypher » Sat, Aug 03, 2024, 2:32 AM UTC

actionfromafar wrote: post #5

jshipc wrote: post #4

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.

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.

Post by actionfromafar » Sat, Aug 03, 2024, 10:29 PM UTC

snypher wrote: post #33

actionfromafar wrote: post #5

Earlier quoted context omitted.

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.

They talk about shutter lockup which would imply electronic shutter, I think.

Post by buck746 » Wed, Aug 07, 2024, 2:09 AM UTC

cladopa wrote: post #9

jshipc wrote: post #4

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.

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.