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Simon Lucas

Member Since 19 Mar 2013
Offline Last Active May 30 2016 10:17 AM
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Posts I've Made

In Topic: DIY Film Scanner (With Samples)

12 February 2016 - 05:29 AM

Just finished capturing about 40 reels of normal8 and super8 film with my diy telecine device.

I could not have done it without some great tips on this forum. Thanx all!

 

some technical details and samples :  

 

Stunning piece of work. I'm impressed by the sheer quality workmanship and attention to detail.

 

Personally, I got my stepper all rigged up and working at xmas, but then I stalled when it came to designing the LED light source. Would you be willing to share more detail about how you did that?


In Topic: Stepper motor spec for converting Super 8 projector

10 January 2016 - 08:47 AM

Yeah Simon, you basically want to come up with a way to know when one full revolution has occured, and you stop the motor at that point, either with an interrupt, or by just constantly polling whatever sensor you have.

 

The first way I did it was to hack apart a mouse, and use the mouseclick to trigger the image capture. This did work pretty well at first, but ultimately because there's a physical thing pressing against a physical part, it wears out and breaks. And because one roll of film is going to click that thing something like 3000+ times, it wore out pretty quickly. So ideally you want a way to detect when a frame is finished being pulled down and is ready for capture without physical contact.

 

Then solution I came up with was a photoresistor behind a hole behind the shutter, with an LED on the other side of the shutter. When the shutter is not between the LED and the photoresistor, it detects a lot of light, when the shutter passes between them, it detects less or no light. Every three shutter passes equals one frame, and so my program counts three shutter passes and then stops the motor.

 

I got this idea from looking at the Müller HM Data Framescanner, which was the initial inspiration to try and build a scanner in the first place. But there may be other better ways to detect the position of the stepper motor. A hall effect sensor - magnet combo, possibly? Or a rotary encoder on the motor itself? Lots of possibilities. I do plan to look into it more some day soon. 

 

Josh - thanks for your input. I now have a basic mechanical system working - without the light and optics. A lot of it was inspired by your posts, along with some ideas from carl Hooper. I certainly got the motor spec from you and perhaps the idea of the photo-diode.

 

Here's the initial build. 

 

IMG_5178.jpg

 

Here's the one with the LED and photodiode that gives feedback to the Arduino.

 

IMG_5188.jpg

 

I'm now thinking about the light source. I was going to run an LED off the Arduino but I had no idea that LEDs could be so complex - with power ratings, current draw and heat dissipation important considerations. Also round LEDs and flat LEDs that affect the evenness of the light.  

 

I presume that with monochrome the key factors are brightness and evenness.

 

I have seen LEDs which have lenses and wonder whether this could contribute to an even light distribution?

 

I found these Luxeon LED assemblies, and I'm currently wondering whether they might be a good solution...

 

http://www.luxeonsta...-rebel-plus-led


In Topic: Stepper motor spec for converting Super 8 projector

31 December 2015 - 05:58 AM

Hi Simon,

 

sounds good. My force gauge is still out on loan. Must get it back.

 

C

 

There's a really bad Star Wars joke in there somewhere. Luckily, I can't think what it is.


In Topic: eumig 860 pma Worst battery compartment ever?

12 December 2015 - 07:40 PM

Freya.

 

Everything I have just read about your camera seems to say that is a good camera. It does sound like it is worth persevering with. 

 

I'm not clear what the problem is apart from the battery compartment taking some time work out.

 

Perhaps the battery compartment is quirky. That's not unusual. To put it in context, the battery compartment on the Leicina Special is very bad. It also uses 5 batteries which threaten to fall out until the rubberised cover is on. The body of this camera has small brass pins to connect to the battery compartment that do not look like they will make good contact.  But then it is also a great camera.

 

 

 

Questions:

 

Is the camera working when you have the batteries in? If not are the contacts all clean? I recommend a small ink rubber to clean them. Silly question, but are all the batteries the way round? (Hard to work out at times with the Leicina)

 

How about sharing some photos of the holder? To check if there is a part missing?

 

And when it is working I recommend buying 2 sets of 4 Eneloop batteries. They are the best rechargeables on the market


In Topic: Stepper motor spec for converting Super 8 projector

12 December 2015 - 03:25 PM

Carl, I hope this reaches you before you make any measurements for me.

 

I have found and bought a stepper. It has Holding Torque 90N.cm, Detente Torque 3.5N.cm 2A/Phase. I think it will enough.

 

I have found a £5 Eumig 502 projector and taken out the motor. I am planning how to mount the motor, feedback unit and LED light.

 

I hope to get this built over the holiday period.

 

Thanks for you input.


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Visual Products

Aerial Filmworks

Paralinx LLC

FJS International, LLC

CineTape

Rig Wheels Passport

Metropolis Post

Gamma Ray Digital Inc

Tai Audio

Media Blackout - Custom Cables and AKS

Broadcast Solutions Inc

Willys Widgets

Ritter Battery

Abel Cine

CineLab

New Pro Video - New and Used Equipment

Technodolly

rebotnix Technologies

The Slider

Glidecam

Wooden Camera