8mm Forum: Cement Joining Super 8

»	8mm Forum » 8mm Forum » Cement Joining Super 8

UBBFriend: Email this page to someone!

Author

Topic: Cement Joining Super 8

Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted June 22, 2014 02:38 AM

What Super 8 film stock cannot be joined using cement?
I understand that polyester stock can only be joined with tape, but how does one identify such films?

--------------------
Maurice

| IP: Logged

Steve Klare
Film Guy

Posts: 7016
From: Long Island, NY, USA
Registered: Jun 2003

posted June 22, 2014 07:09 AM

If you hold up the reel sidways to a light, polyester film will appear amber to brown through the reel openings. Acetate is much more opaque and will look almost black.

When you've seen a few the difference is pretty pronounced. On a polyester print it's much easier to see the curves of layers of sprocket holes in the film than acetate.

Good samples to try this out on would be a late Derann print (poly) and a film shot with Kodak camera film (acetate).

--------------------
All I ask is a wide screen and a projector to light her by...

| IP: Logged

Dominique De Bast
Film God

Posts: 4486
From: Brussels, Belgium
Registered: Jun 2013

posted June 22, 2014 08:42 AM

Polyester is said to be thinner but I don't know if the difference with acetate can be seen on this criterion.

--------------------
Dominique

| IP: Logged

Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted June 22, 2014 10:04 AM

A lot of Derann's last releases were on Agfa stock, does this mean that all films on Agfa stock are polyester?

--------------------
Maurice

| IP: Logged

David Ollerearnshaw
Phenomenal Film Handler

Posts: 1373
From: Penistone Sheffield UK
Registered: Oct 2012

posted June 22, 2014 11:48 AM

When Polyester film was first mentioned in the old film magazines I was sure that an article mention that you couldn't use cement splices you had to use tape, which was the cheap home method.

Libraries could us an ultrasonic splicer, but at a large cost, sure a figure of around £500 was mentioned.

This post revived my memory here's a link to a short piece on them Spliceres

--------------------
I love the smell of film in the morning.

http://www.thereelimage.co.uk/

| IP: Logged

Maurice Leakey
Film God

Posts: 5895
From: Bristol. United Kingdom
Registered: Oct 2007

posted June 23, 2014 03:45 AM

I suppose the only answer is if a cement join does not hold then the film is polyester.

--------------------
Maurice

| IP: Logged

Martin Jones
Phenomenal Film Handler

Posts: 1269
From: Thetford , Norfolk,England
Registered: May 2008

posted June 23, 2014 04:38 AM

Exactly, Maurice! It takes an old stager to see the wood for the trees.
Martin

--------------------
Retired TV Service Engineer
Ongoing interest in Telecine....

| IP: Logged

Bryan Chernick
Jedi Master Film Handler

Posts: 654
From: Bothell, WA, USA
Registered: Mar 2010

posted June 23, 2014 11:32 PM

Polyester film doesn't hold a curl like cellulose film. It will hang almos straight down if you let out a few feet.

| IP: Logged

All times are Central

Printer-friendly view of this topic

UBB.classic^TM 6.3.1.2