I was focusing Source 4's today

gafftapegreenia

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And like a brilliant flash, a realization came to me, why has no one ever made an Ellipsoidal with some sort of screw-feed focus mechanism? Why must every ERS use a hand-tightened knob? I know the S4 Zoom uses a single knob, but why are ERS's still using a hand knob, when even the best Fresnel's use a screw feed? Just my random musings.
 

Sean

Active Member
And like a brilliant flash, a realization came to me, why has no one ever made an Ellipsoidal with some sort of screw-feed focus mechanism? Why must every ERS use a hand-tightened knob? I know the S4 Zoom uses a single knob, but why are ERS's still using a hand knob, when even the best Fresnel's use a screw feed? Just my random musings.

If you're talking about the lens train, I'd speculate that it would make it more expensive, AND make it harder to swap tubes.

--Sean
 

gafftapegreenia

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Yea, that's what I thought too, but hey, this is Controlbooth, so I felt safe posting my random thoughts.
 

Grog12

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I have a strong dislike of screw feed fresnels.....and I can see how that would be amplified with an ERS
 

soundlight

Well-Known Member
I'd be fine with a house full of Warp Zooms. Now that's a nice fixture. As close to "screw focus" as you're gonna get.
 

Footer

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I'd be fine with a house full of Warp Zooms. Now that's a nice fixture. As close to "screw focus" as you're gonna get.

Ya... don't get me started on those... Interesting idea but it takes to long to get a focus laid in for one unit, plus you never really know where everything is. Basically, they made a mechanism for a mover to interact with and then went "I wonder if anyone will buy this without the yoke".
 

soundlight

Well-Known Member
I definitely see how that would be the case. But the mover version does look like quite a spiffy unit.
 

DarSax

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Hey...anyone want to explain what a screw-feed mechanism is for me? D:
 

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One more thing on the screw thing.... because it worked soooo well on the 8" fres.... the number of hours that I have spent fixing those...
 

gafftapegreenia

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I'd still take a screw-fed over that slider thing on the Altman die-cast Fresnels.
 

Logos

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Hey...anyone want to explain what a screw-feed mechanism is for me? D:

As set up on the old Strand lights.

There is a long worm screw fitted along one side of the body internally. The lamp housing is fitted to this worm screw in such a way that it will move forwards or backwards as the external screw knob is rotated. It was given to jamming in earlier models and needed a certain amount of care and attention even in more recent versions. Use graphite or heat proof silicon lubricant to keep operating smoothly.
 

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