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The Ultra Panavision 70 Projection Lens Adjustment and modifications

Read more at
in70mm.com
The 70mm Newsletter
Written by: Tak Miyagishima, Panavision Date: March 18, 2004

To focus on screen

 
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.

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.
Further in 70mm reading:

Panavision story

"It´s a Mad, Mad. Mad, Mad World"

Ultra Panavision 70 Films 

The Ultra Panavision 70 Projection Lens Adjustment and modifications (PDF)


Internet link:

Panavision

Additional work

 
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 22-12-16