This is topic 80 minutes of 70mm ? in forum Large Format Forum at Film-Tech Forum ARCHIVE.


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Posted by Steve Matz (Member # 1890) on 08-10-2014, 12:00 AM:
 
Interesting Photo;This is supposed to be 80 Minutes of 70MM Film. If were running 90 Ft a minute; that's 7200 ft or over 1-3/8th mile of Film.So what does that Calculate for Weight not counting the Platter? I'm sure you wouldn't have to worry about someone walking off with this unless his name was Hercules...


 

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Posted by Monte L Fullmer (Member # 2797) on 08-10-2014, 12:23 AM:
 
5/70mm used 105 ft/min and 15/70mm IMAX used 330ft/min - both at 24fps.

IMAX film that big would weigh in close to 800lbs and is mounted on a half inch deck to support that much weight.

What could be that this is an IMAX print that was played on an early open reel system, thus the payout would be on the outside.
 

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Posted by Terry Lynn-Stevens (Member # 7349) on 08-10-2014, 01:37 AM:
 
Looks like a full length IMAX DMR print to me.
 

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Posted by Randy Pryde (Member # 7488) on 08-10-2014, 01:37 AM:
 
In the interest of accuracy: 4/35 at 24 fps runs 90 feet per minute. 5/70 at 24 fps runs 112.5 feet per minute. The 15/70 print in the photo runs 337.5 feet per minute.
 

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Posted by Darryl Spicer (Member # 711) on 08-10-2014, 11:55 AM:
 

quote: Randy Pryde

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4/35 at 24 fps runs 90 feet per minute

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quote: Darryl Spicer

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Actually it is 96 feet.

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Huh?
I suck at math, but:
24fps for 60sec = 1440 frames per minute

1440 frames divided by 16 frames (1ft)= 90

So, it's 90 feet per minute according to my math
which is right 50% of the time. (and that's almost half!)

 

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Posted by Steve Guttag (Member # 268) on 08-10-2014, 03:42 PM:
 
A flaw is in the source measurement.

Film is dimensioned (for positive release prints) at .1870" per perforation.

Thus it runs at .1870x4 = .7480"/frame. The 16 frame/foot is off as 16 frames is actually 11.968" so you are going to multiply that out and multiply the error with it. So 16 frames/foot is an approximation that is sufficient for its purpose.

.1870" x 4 x 24 x 60 = 1077.12" or 89.76-feet...which again is an approximation but one that is sufficient for its purpose.

Kind of like there are 8-turns of a house reel (5" hub) between cue marks...sufficient to know where they should be...just not what you should use for critical measurement.

The big flaw in Darryl's math above was the "1.6" factor. As Don Adam's would say..."he missed it by this much." The factor is 1.5

16frames/foot x 1 second/24 frames yields .66667 seconds/foot or if you invert it...1.5 feet/seconds, not 1.6. 1.5 feet/seconds x 60 seconds = 90-feet. So Jim's math is better than 50% right this time!
 

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Posted by Steve Matz (Member # 1890) on 08-10-2014, 04:02 PM:
 

quote: Randy Pryde

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In the interest of accuracy: 4/35 at 24 fps runs 90 feet per minute. 5/70 at 24 fps runs 112.5 feet per minute. The 15/70 print in the photo runs 337.5 feet per minute.

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OK if this is 15/70 at 337.5fpm x 80min = 27,000ft divided by

5280ft(1mile) = 5.114 miles...Do you really think there is

more than 5 miles of film on that Platter....I would like it

unspooled and measured end to end please just for

verification
 

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Posted by Darryl Spicer (Member # 711) on 08-10-2014, 05:11 PM:
 
Yep missed it by that much. I was thinking literally instead of mathematically.
 

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Posted by Monte L Fullmer (Member # 2797) on 08-10-2014, 06:36 PM:
 
Interesting of the shoe polish that separates the reels.

Could be 5/70 using DTS, or even CDS due to the lack of magnetic striping.

Or, 8/70 Megasystem, which then could come close to the "80 minutes" topic.
 

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Posted by Steve Matz (Member # 1890) on 08-10-2014, 08:51 PM:
 
Doing some simple math here. If a 35mm Feature is 2hrs Long

(6Reels) at 90fpm = 1800ft x 6 = 10,800ft divided by 5,280

Equals = 2.045miles....That means this Platter at 40 minutes

less time than a 2hour 35mm Feature would still have over

3 miles of Film left on it. I don't even run 3 miles any more

this is just too much Film Now I see why there is

Digital


Well; Accidents will Happen on Ocassion
 

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Posted by Monte L Fullmer (Member # 2797) on 08-10-2014, 11:28 PM:
 
Good pict !

Been there and done that when not on location and my operators don't check their operation when a splice sticks in the failsafe and the film just pays out everywhere.

But, not a lost cause: find the end and don't touch the pile. One can wind this nest back up on the deck in less than a half hour...then zip it through the Kelmar a few times with media rolls soaked in F-G.
 

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Posted by Manny Knowles (Member # 1171) on 08-11-2014, 02:36 PM:
 

quote: Darryl Spicer

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I was thinking literally instead of mathematically.

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This will make me seem like an insensitive prick, but...

Even with your original algorithm, you should've come out with 1.5 ft/sec. So, the way I see it, you were neither thinking literally nor mathematically.

16 goes into 24 once, with 8 frames leftover. 8 frames = half a foot.
 

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Posted by Steve Guttag (Member # 268) on 08-11-2014, 05:36 PM:
 
God Manny! What an insensitive prick!
 

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Posted by Steve Matz (Member # 1890) on 08-11-2014, 11:16 PM:
 
Now I know why MANNY says the Things he Does!


 

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Posted by Darryl Spicer (Member # 711) on 08-12-2014, 02:40 AM:
 

quote: Manny Knowles

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Even with your original algorithm, you should've come out with 1.5 ft/sec. So, the way I see it, you were neither thinking literally nor mathematically.

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Well seeing as I literally wrote down 1.6 as in 1 foot 6 inches instead of.....ah hell I don't give a shit anymore....
 

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Posted by Mark Gulbrandsen (Member # 72) on 08-12-2014, 09:05 AM:
 

 

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Posted by Manny Knowles (Member # 1171) on 08-12-2014, 05:38 PM:
 
(wow)
 

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Posted by Dick Vaughan (Member # 540) on 08-13-2014, 09:20 AM:
 
Here are official weights for some IMAX QTRU platters

53.5” film platter With max film load (78min) 298 lbs.
72” film platter With max film load (159min) 586 lbs.
72” film platter Without film 151 lbs.
 

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Posted by Steve Matz (Member # 1890) on 08-13-2014, 09:53 PM:
 

quote: Dick Vaughan

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72” film platter With max film load (159min) 586 lbs.

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Well I don't think we have to worry about anyone carting that Platter off anywhere.If a Guy could lift that,then you wouldn't want to Tangle with him anyway PLEASE,GO AHEAD AND TAKE THE PLATTER SIR
 

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Posted by Steve Matz (Member # 1890) on 08-15-2014, 06:46 PM:
 

quote: Monte L Fullmer

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Interesting of the shoe polish that separates the reels.
Could be 5/70 using DTS, or even CDS due to the lack of magnetic striping.
Or, 8/70 Megasystem, which then could come close to the "80 minutes" topic.

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Was that Standard Procedure to use White Shoe Polish when Plattering up Reels from a MUT?(35mm/70mm) The Film Exchange didn't mind this when you sent the Film Back to them.
 

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Posted by Paul Mayer (Member # 355) on 08-15-2014, 10:27 PM:
 
Shoe polish on a print? Especially a 1570 print?

Gads I hope not!

If those white areas are the reel joins I wonder why they're marked for so many frames at each join? It's not like you need to find the reel joins anyway once the print is assembled - it's never going to be taken apart again - it will ship intact. But even if you ever have to, the reel joins are pretty easy to see - no need to mark the join. But if you have to, and you're not doing ultrasonic, you can use splice tape.

But shoe polish??? Never! Never! Never! Never! Never!

I've seen poor operators use a China marker to mark the start frame and the roll back frame for threading. That marker crap really makes a mess in the film path and the field flattener quartz and wipers that requires extra effort to clean before threading the next show. We marked those frames (start and rollback) too, but used tinted splice tape. No dirt that way! Still have to clean the path before threading, but it goes much easier.

Again, shoe polish?

Never! Never! Never! Never! Never!
 

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