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» Film-Tech Forum   » Operations   » Large Format Forum   » 80 minutes of 70mm ? (Page 1)

 
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Author Topic: 80 minutes of 70mm ?
Steve Matz
Jedi Master Film Handler

Posts: 672
From: Billings, Montana, USA
Registered: Sep 2003


 - posted 08-10-2014 12:00 AM      Profile for Steve Matz   Email Steve Matz   Send New Private Message       Edit/Delete Post 
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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Monte L Fullmer
Film God

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From: Nampa, Idaho, USA
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 - posted 08-10-2014 12:23 AM      Profile for Monte L Fullmer   Email Monte L Fullmer   Send New Private Message       Edit/Delete Post 
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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Terry Lynn-Stevens
Phenomenal Film Handler

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From: Toronto, Ontario, Canada
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 - posted 08-10-2014 01:37 AM      Profile for Terry Lynn-Stevens   Email Terry Lynn-Stevens   Send New Private Message       Edit/Delete Post 
Looks like a full length IMAX DMR print to me.

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Randy Pryde
Film Handler

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From: Casper, WY, USA
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 - posted 08-10-2014 01:37 AM      Profile for Randy Pryde   Author's Homepage   Email Randy Pryde   Send New Private Message       Edit/Delete Post 
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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Darryl Spicer
Film God

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From: Lexington, KY, USA
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 - posted 08-10-2014 11:55 AM      Profile for Darryl Spicer     Send New Private Message       Edit/Delete Post 
quote: Randy Pryde
4/35 at 24 fps runs 90 feet per minute
Actually it is 96 feet.
24 frames per second = 16 frames in a foot so that would be 1.6 feet per second X 60 seconds =96 feet per minute.

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Jim Cassedy
Phenomenal Film Handler

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From: San Francisco, CA
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 - posted 08-10-2014 02:00 PM      Profile for Jim Cassedy   Email Jim Cassedy   Send New Private Message       Edit/Delete Post 
quote: Darryl Spicer
Actually it is 96 feet.
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!)
[Roll Eyes]

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12083
From: Annapolis, MD
Registered: Dec 1999


 - posted 08-10-2014 03:42 PM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
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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Steve Matz
Jedi Master Film Handler

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From: Billings, Montana, USA
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 - posted 08-10-2014 04:02 PM      Profile for Steve Matz   Email Steve Matz   Send New Private Message       Edit/Delete Post 
quote: Randy Pryde
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.
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 [Eek!] just for

verification [Big Grin] [beer]

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Darryl Spicer
Film God

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From: Lexington, KY, USA
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 - posted 08-10-2014 05:11 PM      Profile for Darryl Spicer     Send New Private Message       Edit/Delete Post 
Yep missed it by that much. I was thinking literally instead of mathematically.

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Monte L Fullmer
Film God

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From: Nampa, Idaho, USA
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 - posted 08-10-2014 06:36 PM      Profile for Monte L Fullmer   Email Monte L Fullmer   Send New Private Message       Edit/Delete Post 
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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Steve Matz
Jedi Master Film Handler

Posts: 672
From: Billings, Montana, USA
Registered: Sep 2003


 - posted 08-10-2014 08:51 PM      Profile for Steve Matz   Email Steve Matz   Send New Private Message       Edit/Delete Post 
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 [Confused] Now I see why there is

Digital [puke]

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Well; Accidents will Happen on Ocassion [Roll Eyes] [Eek!]

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Monte L Fullmer
Film God

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From: Nampa, Idaho, USA
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 - posted 08-10-2014 11:28 PM      Profile for Monte L Fullmer   Email Monte L Fullmer   Send New Private Message       Edit/Delete Post 
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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Manny Knowles
"What are these things and WHY are they BLUE???"

Posts: 4247
From: Bloomington, IN, USA
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 - posted 08-11-2014 02:36 PM      Profile for Manny Knowles   Email Manny Knowles   Send New Private Message       Edit/Delete Post 
quote: Darryl Spicer
I was thinking literally instead of mathematically.
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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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12083
From: Annapolis, MD
Registered: Dec 1999


 - posted 08-11-2014 05:36 PM      Profile for Steve Guttag   Email Steve Guttag   Send New Private Message       Edit/Delete Post 
God Manny! What an insensitive prick! [Big Grin]

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Steve Matz
Jedi Master Film Handler

Posts: 672
From: Billings, Montana, USA
Registered: Sep 2003


 - posted 08-11-2014 11:16 PM      Profile for Steve Matz   Email Steve Matz   Send New Private Message       Edit/Delete Post 
Now I know why MANNY says the Things he Does! [Wink] [Eek!]

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