Telecine with a Bolex 18-5L

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Konton
Posts: 504
Joined: Fri Oct 25, 2002 1:22 am
Real name: Justin K Miller
Location: Detroit, MI
Contact:

Telecine with a Bolex 18-5L

Post by Konton » Mon Oct 03, 2016 6:56 pm

I've been working on trying to convert a Bolex 18-5L to transfer frames of Super 8 film for about 6 years. I choose the Bolex because I loved the retro metal body and wanted to keep both form and function in the project. It's not been a priority as I started the project the day before my son was born. Anyway things happen, technology progresses, and additional solutions present themselves.

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The current plan is to capture frames and control the motor using a Raspberry Pi. This way I can capture a frame, then have a command to go to the next frame and repeat. It seems pretty easy, if I just new how to code in python.

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Capturing the frames is actually the easy part. And in order to make it easier I pretty much gutted the projector. The light for the project is actually on a system to easy move around x-axis and y-axis.

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I ripped the light out and 3D printed a mount to place a Raspberry Pi camera module. Where the lens of the projector would be I have some translucent acrylic to let whatever light I choose brighten the frame.

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The new Raspberry Pi camera module v2.1 has a great lens that's adjustable for macro work. That is after you remove the glue.

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I was going to keep the regular motor and try to capture at 5fps or 18fps. But considering how long it takes for a high rez image to get saved, it seemed like making it slow would be easier.

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So I took a spare Nema 17 motor lying around and used a 1/4" coupler to attach it to the shaft where the fan used to be.

[youtube]http://www.youtube.com/watch?v=xk_3hAGF0nE[/youtube]

I've been able to test motion. But now I have to get this all wired together with a stepper motor controller hat. I tried one and accidentally burned it out. Oh well. Maybe I'll get this done another year. Anyway, hope you enjoyed my weekend tinkering.
Justin Miller

dadu007
Posts: 15
Joined: Fri Jan 01, 2016 6:22 pm
Real name: Dan Peterson

Re: Telecine with a Bolex 18-5L

Post by dadu007 » Thu Oct 06, 2016 9:56 pm

Sounds like a great project! I've just started a similar one: Planning to use a Eumig Mark 8 with a Raspberry Pi (B+) with v2 camera. Have you seen this guy's project and python code for Raspberry Pi?

https://github.com/jas8mm/rpitelecine

dadu007
Posts: 15
Joined: Fri Jan 01, 2016 6:22 pm
Real name: Dan Peterson

Re: Telecine with a Bolex 18-5L

Post by dadu007 » Thu Oct 06, 2016 9:56 pm


Konton
Posts: 504
Joined: Fri Oct 25, 2002 1:22 am
Real name: Justin K Miller
Location: Detroit, MI
Contact:

Re: Telecine with a Bolex 18-5L

Post by Konton » Sun Oct 09, 2016 4:09 am

Yes. I am a huge fan of that project! But for this project I wanted a self-enclosed metal projector that basically does what it was meant to do. Move film through a gate.

Anyway I 3D printed a bunch of parts, and broke a bunch of stuff in the process during the week. This was the result of my first test tonight:

https://youtu.be/RIlQAkI6Tnc

Why can't I post videos here? Anyway that was just testing 5 frames and a 2 second delay in between. The python code is:

from rrb3 import *
import picamera
camera = picamera.PiCamera()
import time
rr = RRB3(12.0,12.0)
camera.vflip = True
camera.start_preview()
camera.capture('image1.jpg')
time.sleep(2)
rr.step_forward(0.002,50)
camera.capture('image2.jpg')
time.sleep(2)
rr.step_forward(0.002,50)
camera.capture('image3.jpg')
time.sleep(2)
rr.step_forward(0.002,50)
camera.capture('image4.jpg')
time.sleep(2)
rr.step_forward(0.002,50)
camera.stop_preview()
GPIO.cleanup()

Now if I can just make an easier way to setup and focus the camera I'd be in business!
Justin Miller

dadu007
Posts: 15
Joined: Fri Jan 01, 2016 6:22 pm
Real name: Dan Peterson

Re: Telecine with a Bolex 18-5L

Post by dadu007 » Tue Oct 11, 2016 12:30 am

Is the Pi taking pics of the emulsion side of the film?

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