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Topic: Kinoton FP 30E focus problem rhs  (Read 1671 times)
TechPW
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« on: February 09, 2011, 06:45:59 AM »

Can anyone suggest a cure for a distinct focus problem on a matched pair of projectors.
The problem is on the rhs for both the left and right projector, extends to about one third
of the screen, measured on an RP-40 test object.  Thanks in advance
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Xenon
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Xenon light is nice and bright! Keep in focus!


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« Reply #1 on: February 09, 2011, 04:30:07 PM »

Hello TechPW,

Welcome to the forum.
Could you specify your problem a little more?
If you focus the lhs is sharp and the rhs is not?
Can you focus the rhs? And then the lhs is out of focus?
And your problem is the same on both projectors?
You used a 35-mm Projector Alignment and Screen Image Quality Test Film (SMPTE) to check it?

Xenon.
« Last Edit: February 09, 2011, 04:35:57 PM by Xenon » Logged
exciterlamp
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« Reply #2 on: February 09, 2011, 04:54:28 PM »

How near are the machines to the screen.  And what angle are they to the screen?
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TechPW
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« Reply #3 on: February 16, 2011, 04:53:37 AM »

A bit more information on the problem and thanks for your help and interest

We can bring the rhs into focus but centre and lhs are so far out of focus that the RP-40
shows even the 28 line ruling as unresolved.
If I hold a hand held screen (sheet of A4) in the light path for the rhs and move to a point where
it is in focus I am now 6ft closer to the projector, not depth of field then?! Huh

The problem is the same on both projectors i.e. out of focus on the rhs albeit the left hand projector
is angled slightly to the right and the right project is angled slightly to the left!

The projectors are 8.5m from the screen.


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Xenon
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« Reply #4 on: February 17, 2011, 10:25:23 AM »

Hello,

Do both projectors have their own lenses or do you use (during testing) the same set of lenses for both projectors?
What lenses are you using? ( brand and focus)
Do you use an anamorphot?
Is the gate in line with the lens? Is the testfilm straight or is it warped or otherwise damaged so that it doesn't run flat in the gate?
Is your xenon lined up properly? (can cause unsharpness with anamorphot).
Is the gate plane in comparison with the objectif ( isn't it crooked or angled?)
« Last Edit: February 17, 2011, 10:41:29 AM by Xenon » Logged
TechPW
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« Reply #5 on: February 28, 2011, 10:20:27 AM »

Hi again

We have individual flat and scope lens sets for each projector, they all show the problem, worse on flat.

The test film is flat and shows the same problem if projected through the back.

Our current best bet are the lamp housings which we plan to swapout for higher power units in the next week.
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