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The Ultra Panavision 70 Projection Lens
Adjustment and modifications
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The 70mm Newsletter
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Written
by: Tak Miyagishima, Panavision |
Date:
March 18, 2004 |
To focus on screen
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The
Ultra Panavision 70 projection lens. Picture by Thomas Hauerslev, February
2004
As for the anamorphic attachment, what we do is to adjust the spacing
between the rear and front anamorphic elements. (We only move the front
element). In our case we drill and tap a couple of holes so that we're
able to lock off the front element after we adjust it for the proper
projection distance.
• Go to PDF:
The Ultra Panavision 70 Projection Lens
Adjustment and modifications
I hope you're equipped with a bench where you can project an image with
the attachment in front of any prime lens so that you can then make the
adjustment with anamorphic front element to achieve your required throw
and then locking it off with set screws. I saw "Mad 4" at the
Cinerama Dome as they were setting up and it looked quite good even though
I don't believe in curved screens.
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Further
in 70mm reading:
Panavision story
"It's a Mad, Mad, Mad, Mad
World"
Ultra
Panavision 70 Films
PDF:
The Ultra Panavision 70 Projection Lens
Adjustment and modifications
Internet link:
Panavision
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Additional work
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Another
view of the Ultra Panavision 70 projection lens. Picture by Thomas
Hauerslev, February 2004
From my instructions of yesterday I omitted an operation that we do to the
main housing, and also we had to make a new part.
The new part is a ring
that is threaded into the housing at the rear, which also has a male
thread that would accept either the Schneider or Isco projection lenses. I
mentioned those two but the thread is a standard, which should mate with
any manufacturers lens.
The operation that is required to the main
housing: you'll find the existing depth from the front to the shoulder to
be 3.05" deep. What we've done is to machine in deeper so that the
dimension is now about 3.15”, which would still leave a shoulder of
about .05". With the additional depth of .10" you'll now be able
to make your minor adjustment to achieve your required throw.
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Updated
28-07-24 |
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