Author
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Topic: Focusing Frustration
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Paul Adsett
Film God
Posts: 5003
From: USA
Registered: Jun 2003
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posted November 25, 2009 12:58 PM
What is it about Elmo projectors that keeps you fiddling with the focusing knob during the film? Both my GS1200'S seem to have 'rubbery' focusing, you can never seem to get that razor sharp condition across all areas of the screen at the same time, and if you do, it does not seem to stay that way for very long. So showing films on a GS, at least for me, means riding the focusing knob during the reel. Contrast that with my Eumig's which seem to really 'snap' into sharp focus and then stay that way throughout the reel.
-------------------- The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection, Elmo GS1200 f1.0 2-blade Eumig S938 Stereo f1.0 Ektar Panasonic PT-AE4000U digital pj
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Paul Adsett
Film God
Posts: 5003
From: USA
Registered: Jun 2003
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posted November 26, 2009 09:36 AM
I think you are right David. The lens is just not held very tightly or very precisely on the Elmo's - when you focus you can actually see the lens rock a little from side to side. Also, there is insufficient spring force to bias the lens against the snail cam, so you end up with a huge amount of 'backlash' when you rotate the lens knob. On the Eumigs, the lens is heavily sprung into a 'v-block' which is precision machined directly into the chassis and exactly perpendicular to the plane of the gate, and there is a really strong spring to push the lens against the snail cam - so there is no lens wobble at all. Does anybody have a procedure for setting up the lens on the GS1200? I know that you adjust the little screw by the gate for side-to-side focus, and loosen the two lens mount screws to adjust top-to-bottom focus, but this is a real hit and miss adjustment because there is so much 'cross-talk' between them How exactly are you supposed to do this?
-------------------- The best of all worlds- 8mm, super 8mm, 9.5mm, and HD Digital Projection, Elmo GS1200 f1.0 2-blade Eumig S938 Stereo f1.0 Ektar Panasonic PT-AE4000U digital pj
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