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I ran into a situation where Shrek 2 performed very poorly in the analog house as far as SPL is concerned. I had to run the fader at 10!

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While it may be due to either a slightly off-center soundtrack, or a mal-adjusted latteral guide setting,

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If it is the latteral guide, why would the trailers play fine but not the feature? Can that happen with a incorrect setting?

Ill take a look at this today. Thanks guys.
 

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Posted by Gordon McLeod (Member # 33) on 06-07-2004, 11:20 AM:
 
The BACP has the widest scanning area out in the field so lateral alignment is very criticle as would be lab printing tolerences
 

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Posted by John Pytlak (Member # 331) on 06-07-2004, 12:59 PM:
 
Before you change the lateral guiding adjustment of your reader (not really recommended without proper test films), check the position of the timecode track on the print itself. SMPTE Recommended Practice RP111 specifies that the centerline of the data record should be 0.297 +/- 0.001 inches, or 7.54 +/- 0.03 millimeters from the reference edge of the print. The inside edge of the printed analog track should be 0.281 inches or 7.14 millimeters from the reference edge.
 

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Posted by Bruce Hansen (Member # 281) on 06-07-2004, 08:39 PM:
 
Or just compare it to a known good piece of film. If the DTS track, and/or optical sound track is out of place that may be your problem.
 

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Posted by Brad Miller (Member # 2) on 06-07-2004, 09:21 PM:
 
Not to intentionally poke fun at you John (well ok, yeah it's to poke fun at you), just exactly how is the average theater supposed to precisely measure the location of the dts track on a suspected print??? Can we just use our tape measure and round to the nearest 1/16 inch?
 

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Posted by John Pytlak (Member # 331) on 06-07-2004, 10:16 PM:
 
Edmund Scientific and others have a variety of measuring microscopes and loupes that have accurate reticles:

http://www.edmundoptics.com/onlinecatalog/DisplayProduct.cfm?productid=1600

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This 6X Pocket Comparator has hundreds of applications in industry, in the laboratory and at the workbench. Resting directly on work surfaces, it is ideal for checking small parts, linear measurements, angles, hole diameters and thread sizes. Unlike lower priced comparators with only a simple lens, the 6X incorporates a triplet lens. It provides an extremely flat field over the entire reticle area. Clear acrylic cell allows outside light to illuminate the subject. Accepts all 27mm reticles. Reticle is made from quality optical glass.

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Extremely portable comparator is only 1-3/4" high x 1" O.D. Its glass reticle is superior to film reticles in many other pocket comparators which can bend, warp or become damaged due to oils or solvents. Optical lens system is distortion-free right to the edge of the field. Cell of transparent Lucite admits plenty of light to reticle and work. Accepts all 21mm reticles.

Reticle Description:
A special feature of the reticle is the tickness comparison scale (E). A series of parallel lines 0.002" to 0.007" apart enable visual and direct measurement of the thickness of materials. Mechanical measurements of such items are sometimes inaccurate, because materials often compress. Linear scales are provided in bot millimeters (B) and decimal inches (C). The 10mm long metric scale is divided into units of 0.2mm. The 0.5" decimal inch scale is marked in units of 0.005". Scales to compare hole diameters read in fractions from 1/64" to 1/16" (A) and in decimals from 0.005" to 0.050"(D). Both the reticle and the object to be measured are magnified 6 times.

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Our portable and compact direct measuring field microscope can conveniently travel from the desktop to the job site for critical inspection and measurement. Each scope includes focus ring for crisp, clear images. Using the reticle focus adjustment, the 1/20mm scale reticle can be brought into sharp focus when superimposed on the internal image. Clear acrylic base allows the instrument to rest directly on a flat object, while passing ambient light. Two cutaways (180° apart) in the clear base allow fine instruments to touch the object under inspection. The base can be removed to accomodate irregular objects. The base and bottom macro lens can be removed for added flexibility as an erect-image 8X telescope for long distance requirements. Padded storage case included. Reticle: 2.5-0-2.5mm, 0.05mm incr. Note that focus ring is on the removable macro lens.

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These powerful direct measuring scopes are no larger than a fountain pen. Available in your choice of a measuring glass reticle in metric or inch scales. Can be purchased with or without optical clear plastic base. Stands only 4 1/4" high and weighs two ounces. The 50X magnification provides quick, close examinations to detect flaws or imperfections, make surface measurements or examine fibers or print. Base (1 1/2" O.D.) converts the unit to a free standing microscope that can be focused and locked. The inch reticle length is 1/10" with 0.001" divisions. The millimeter reticle length is 2.5mm with 0.02mm divisions. Made exclusively for Edmund Industrial Optics.

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Posted by Brad Miller (Member # 2) on 06-07-2004, 10:26 PM:
 
I would have expected nothing less from you!
 

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Posted by Stephen Frazza (Member # 2320) on 06-08-2004, 11:44 PM:
 
I compared the bad Harry Potter print with film from some other prints that I knew to work &
right away I could see that the timecode was much closer to the soundtrack then on the other good prints.

So I guess this was causing the problem and it was the prints. But I would still like to adjust the lateral allignment of my reader if I could get my hands on some test film.

Thanks for all the help guys.
 

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Posted by Steve Guttag (Member # 268) on 06-09-2004, 07:54 AM:
 
The print I saw last night of HP3 didn't look like it had a high-magenta optical track but a conventional optical track. The DTS system was tracking the print just fine too...if the track was off laterally, the DTS reader would also have had issues.

The picture of this print was also pretty darn sharp throughout though I was seated about 4 screen heights away.

Steve
 

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