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Topic: Align-O-Tron – Tips & Tricks
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Manny Knowles
"What are these things and WHY are they BLUE???"
![](http://www.film-tech.com/ubbmembers/1171i.jpg)
Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002
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posted 06-14-2002 09:01 PM
First things first...If you don't know about the Align-O-Tron. It is a laser-equipped device for doing optomechanical alignments. Visit the website for a detailed description: http://www.muellersatomics.com/alignotron.htm I got my kit some time ago and I finally made a special trip to the cinemas just to try it out. I think it's great but it took me a few tries to get the hang of it. I always ended up having to readjust the height of the anode for some reason... ...and then it hit me... ...How do I know that the lenses are centred to the aperture? Seems to me that what I need is a special "dummy" aperture plate with a hole drilled dead-centre of the picture area. I took a new aperture plate and got the local aluminum shop to cut a matching piece (with no apertures cut into it) and now what I need is an idea of how to locate the absolute centre of the picture area. I inserted it into the film trap and scribed the shape of the opening onto the blank plate. Next I made corner-to-corner crosshairs to locate dead-centre. However...that exposes the soundtrack too...so centre of the picture area would be slightly to one side of that. A piece of RP-40 revealed how far off-centre to drill. I just did this today, so I haven't tried this as part of an actual alignment yet. I'll post a pic when my camera is working again.
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Manny Knowles
"What are these things and WHY are they BLUE???"
![](http://www.film-tech.com/ubbmembers/1171i.jpg)
Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002
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posted 06-14-2002 09:30 PM
What's a pinhole aperture plate?I mean, I get the idea...It's what I've been making by hand, right? But is this something I can purchase ready-made from Kelmar instead of reinventing the wheel? Note to Greg: Let us know if/when you make a model that points from the reflector out to the lens...hint hint. ![](http://www.film-tech.com/ubb/wink.gif)
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