8mm Forum: Elmo ST 800 Focus problem

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Topic: Elmo ST 800 Focus problem

Bradford A Moore
Master Film Handler

Posts: 272
From: Provincetown, Ma
Registered: Jul 2005

posted November 21, 2008 11:46 AM

I'm having a problem getting a sharp focus. When I turn the nob it gets close, but then looses focus completely, if I go a little to the left or right. I then turn the nob back and forth to get it back, but doesn't want to get a sharp image like it used to. If there is something I can easily adjust, that would be great!

Thanks

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Bradford A Moore
Master Film Handler

Posts: 272
From: Provincetown, Ma
Registered: Jul 2005

posted November 23, 2008 01:33 PM

Just A Bump Up

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Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted November 23, 2008 04:58 PM

I feel like I want to help here because I also have an ST-800, but I've never had this problem so I was waiting for other wisdom (-assuming I actually have any...).

I just popped the lens out of mine and it looks like all that is involved is a pin on the side of the lens engages a spiraling slot linked to the focus knob. Delightfully simple: doesn't seem anything could go wrong (...until something does!)

Does your lens have the pin in its side?
Does it protrude as far as the slot is deep? (ie: is it jumping the slot wall?)
Is the spiral firmly linked to the knob?

(Will Lassie rescue the lost sheep? Tune in to next weeks episode!)

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All I ask is a wide screen and a projector to light her by...

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Kevin Faulkner
Film God

Posts: 4071
From: Essex UK
Registered: Jun 2003

posted November 23, 2008 05:44 PM

One problem I have seen before on the Elmo machines is the small metal strip spring touching the edge of the protruding rear element instead of the rear of the lens barrel. This means that the lens when pushed back against the spring pushes forward again on its own. The spring strip should be up close against the edge of the lens holder when viewed with no lens.
It should touch the outside of the rear of the lens and not the raised up rear element.
Hope that all makes sense. Very difficult to put into words.

Kev.

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GS1200 Xenon with Elmo 1.0...great combo along with a 16-CL Xenon for that super bright white light.

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