Film-Tech Forum ARCHIVE: Simplex single lens holder "play"

This is topic Simplex single lens holder "play" in forum Film Handlers' Forum at Film-Tech Forum ARCHIVE.

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Posted by John Walsh (Member # 168) on 10-13-2000, 11:36 AM:

I have a question on the regular, single lens holder used on the new Simplexes.

On the two I'm using, the focusing knob is loose. You have to turn it about 1/8 until it starts to move the lens holder, and it does the same thing when turning it the other way. It makes it a litte harder to focus it quickly.

How can I tighten it up? I'm sure it's not the knob itself; I've tighten the allen set screw on there. I've seen the exploded diagram (in the parts book,) but I couldn't see what would cause the "slop."

Also, ours has the little lever to move the lens over (for mag or optical image centering.) When you are looking at it from the front, the lever can go to "12:00" position to "3:00" position. Which position is for optical, and which for mag?

Posted by Greg Mueller (Member # 17) on 10-13-2000, 05:45 PM:

Watch the lens from the front. Move the lever from one position to the other. When it is the furthest away from the operator (and the analog track) it is in the optical position and when it is closest to the operator (and analog track) it is in the mag position

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Greg Mueller
Amateur Astronomer, Machinist, Filmnut

Posted by Brad Miller (Member # 2) on 10-13-2000, 06:12 PM:

Much easier way.

Remove the aperture.

Rotate the lens so the image is pushed as far "projected right" as possible (so the analog track shows). That's your magnetic setting.

Posted by John Walsh (Member # 168) on 10-14-2000, 08:47 AM:

Yes, of course. I should have guessed myself. Both ideas are easy to do...

This particular problem is that it looks like the tech did not put the lever to optical when he filed the aperture plate. Now, you have to look at the screen and adjust it on the fly when changing formats.