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Topic: FOCUS, focus and refocus?

Richard C. Wolfe
Master Film Handler

Posts: 250
From: Northampton, PA, USA
Registered: Apr 2000

posted 09-21-2003 09:49 PM

I thank you Brad for the offer to loan me a lense, but that would not be necessary as I can borrow one locally and save us the trouble and expense of shipping the lense back and forth.

Am I correct in assuming that when you say the prime lense you are referring to what I call the back up lense, or the lense that the anamorphic is attached to? That is a pretty old lense.

However, each time I think that there is something wrong with my lenses, I get a film that suggests otherwise. I am currently playing Seabiscuit, which of course is scope, and is sharp and clear throughout the image area. Why does this change so much from picture to picture?

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12814
From: Annapolis, MD
Registered: Dec 1999

posted 09-21-2003 10:33 PM

Richard...I'd start with the anamorphic attachment...the KA-298 wasn't a great lens (the original Kasaka ones). As old lenses go, B&L were tops including the Super-Cinephores but modern lenses will help you there too.

If you were to update your scope lenses to an ISCO Blue-Star and Schneider or ISCO prime lenses (backup) then you would be shocked at the picture quality...not only sharper but much more vibrant.

Steve

(PS...tell Bob F. I said hi)

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Larry Shaw
Expert Film Handler

Posts: 238
From: Boston, MA, USA
Registered: Mar 2000

posted 09-22-2003 12:51 AM

Steve,

Your comments on the 16th, while correct as usual, don't mention the (stand by for self-promotion) Kinoton gate design that provides a curve but doesn't have the focus issues associated with tension bands. IMHO it's the best of both worlds, especially combined with the slippery Delrin.

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John Hawkinson
Film God

Posts: 2273
From: Cambridge, MA, USA
Registered: Feb 2002

posted 09-22-2003 01:31 AM

John P. says, "SMPTE Recommended Practice RP39, which specifies maintaining an emulsion-in winding orientation for optimum focus stability, was based on Kodak data for projection performance of TRIACETATE prints, which had different curl characteristics than polyester prints: ¶ "Effect of Winding on the Projection Performance of 35mm Motion Picture Film" by Paul H. Preo and Eric A. Yavitz, SMPTE Journal, June 1965, Volume 74, Pages 521-525."

You neglected to include the link to it! SMPTE gave us permission to reproduce is, so here it is in the Manuals section.

--jhawk

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John Pytlak
Film God

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

posted 09-22-2003 05:54 AM

quote:
You neglected to include the link to it! SMPTE gave us permission to reproduce is, so here it is in the Manuals section.

--jhawk

Thank you! [Cool]

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