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» Film-Tech Forum   » Operations   » Film Handlers' Forum   » Focus fight with 'Black Knight'

   
Author Topic: Focus fight with 'Black Knight'
Matt Close
Expert Film Handler

Posts: 226
From: Hervey Bay, QLD, Australia
Registered: Sep 2001


 - posted 04-20-2002 06:55 PM      Profile for Matt Close   Author's Homepage   Email Matt Close   Send New Private Message       Edit/Delete Post 
This is the second print that has done this in recent months!! (grrr) .. the last one was 'Behind Enemy Lines'. You simply
CAN NOT achieve decent focus 'accross' the screen! If you focus the middle properly, then both sides are shot.... try to focus one side, then the middle and the other side are shot .. etc. It is not a projector problem because it does it on all of the projectors these films played on, while all other films look fine...
What causes this? Are these films the victim of some stock problem? ... Or am I just going crazy? .....

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Brad Miller
Administrator

Posts: 17674
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99


 - posted 04-20-2002 07:52 PM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
Assuming this is a second hand US print, has the print been embossed from it's previous use? That would most certainly cause the problem you describe.

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Matt Close
Expert Film Handler

Posts: 226
From: Hervey Bay, QLD, Australia
Registered: Sep 2001


 - posted 04-20-2002 08:04 PM      Profile for Matt Close   Author's Homepage   Email Matt Close   Send New Private Message       Edit/Delete Post 
Embossed? .... Please excuse my ignorance Brad, but you could explain a little more?

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Brad Miller
Administrator

Posts: 17674
From: Plano, TX (36.2 miles NW of Rockwall)
Registered: May 99


 - posted 04-20-2002 08:36 PM      Profile for Brad Miller   Author's Homepage   Email Brad Miller       Edit/Delete Post 
I wish I had a picture to post here. When a film is ran with a high wattage xenon bulb (or the bulb is misfocused or inproper ventilation) the film will "stretch out" and expand away from the heat. The result is that each frame will have what is called "embossing", where each frame protrudes out as compared to the edges and framelines. This defect *normally* does not interfere with projection, but if the film is embossed heavily, it will affect focus like you describe. Just look at the film with a light reflecting on it.

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Matt Close
Expert Film Handler

Posts: 226
From: Hervey Bay, QLD, Australia
Registered: Sep 2001


 - posted 04-20-2002 08:39 PM      Profile for Matt Close   Author's Homepage   Email Matt Close   Send New Private Message       Edit/Delete Post 
Thanks Brad, I shall inspect it after this showing .....
this 'out of focus' showing

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John Pytlak
Film God

Posts: 9987
From: Rochester, NY 14650-1922
Registered: Jan 2000


 - posted 04-22-2002 08:43 AM      Profile for John Pytlak   Author's Homepage   Email John Pytlak   Send New Private Message       Edit/Delete Post 
"Embossing" is a possible cause:
http://www.kodak.com/country/US/en/motion/newsletters/reel/fall97/pytlak.shtml
http://www.kodak.com/country/US/en/motion/newsletters/reel/winter97/projection.shtml

------------------
John P. Pytlak, Senior Technical Specialist
Worldwide Technical Services, Entertainment Imaging
Research Labs, Building 69, Room 7525A
Rochester, New York, 14650-1922 USA
Tel: +1 585 477 5325 Cell: +1 585 781 4036 Fax: +1 585 722 7243
E-Mail: john.pytlak@kodak.com
Web site: http://www.kodak.com/go/motion

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