tribal-warrior
Member
Working on a project at the moment where I'm making a very basic, crude DIY slide projector with a few parts found around the home. Nothing fancy or elaborate. Sort of like a MacGyver slide projector (if he ever needed to make one.) A cardboard box with a circular hole cut out of it will be used to house the Canon FD 50mm f1.4 lens. I'll also make a cardboard stand for the slide to stand up vertically.
Though I'm curious about the light source. Obviously, I want a nice, bright image projected. But I don't want a light that is so bright that it would cause harm to the slide. Most people know what happens when the film gets stuck in the gate of a movie projector. The stationary frame will burn. That actually happened to me once with a super 8 movie projector. I was running a film of mine where I had shot a time lapse sunset and I watched one of the frames freeze on screen and then burn. I stopped the projector straight away.
Although I have used slide projectors in the past, Ive never taken a look inside them. Ive checked online and I notice some of them use 150w and 300w globes. Would there be any kind of diffusion panel to help project the slide? There's a youtube video on how to make a basic slide projector and they say one of the parts you need is a ground glass. But they don't actually mention how the ground glass is used. I'm assuming that the ground glass would be placed between the light source and the slide. I wonder if baking paper could be used instead as an alternative.
The slide has to be very close to the light in order to get a focused image with the lens so it would be a pretty tight space for a diffusion panel.
Though I'm curious about the light source. Obviously, I want a nice, bright image projected. But I don't want a light that is so bright that it would cause harm to the slide. Most people know what happens when the film gets stuck in the gate of a movie projector. The stationary frame will burn. That actually happened to me once with a super 8 movie projector. I was running a film of mine where I had shot a time lapse sunset and I watched one of the frames freeze on screen and then burn. I stopped the projector straight away.
Although I have used slide projectors in the past, Ive never taken a look inside them. Ive checked online and I notice some of them use 150w and 300w globes. Would there be any kind of diffusion panel to help project the slide? There's a youtube video on how to make a basic slide projector and they say one of the parts you need is a ground glass. But they don't actually mention how the ground glass is used. I'm assuming that the ground glass would be placed between the light source and the slide. I wonder if baking paper could be used instead as an alternative.
The slide has to be very close to the light in order to get a focused image with the lens so it would be a pretty tight space for a diffusion panel.
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