[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: Film question
- To: multiple recipients of <telecine at alegria.com>
- Subject: RE: Film question
- From: "Case, Dominic" <Dominic_Case at atlab.com.au>
- Date: Tue, 16 Feb 1999 09:19:33 +1100
- Resent-Date: Mon, 15 Feb 1999 20:02:57 -0600
- Resent-From: telecine at alegria.com
- Resent-Message-ID: <"rkspKD.A.NUD.lGNy2" at sun>
- Resent-Sender: telecine-request at alegria.com
- Resent-To: multiple recipients of <telecine at alegria.com>
SERGE ROBERT asks:-
>Has any of you ever tried to lay down side by side one piece of acetate
>film and one piece of Estar base film? Every time we do, we always
>end up with a difference of one whole sprocket every 3 or 4 feet
Is it possible you are comparing acetate base negative stock with estar
print base? There is a difference between these: the perforation pitch on
negative is .1866", whereas it is .1870" on print film. You would find a
difference of about one perforation height in three feet.
The reason for this is that during printing, negative and raw print stock
pass around a printer sprocket wheel of a certain diameter, and must remain
in perfect contact with no slippage. The print stock is on the outside of
the negative and therefore follows a larger circumference.
There is a minute change in film dimensions during processing and especially
during drying - but this is small compared with the differences we are
discussing here (except in nitrate film!).
email: cased at atlab.com.au
Thanks to Bill Hogan of Sprocket Digital for support in 1999.
No advertising/marketing allowed on the main TIG. Contact rob at alegria.com
anonymous messaging now at http://www.alegria.com/HyperNews/get/ubique.html
1033 subscribers in 41 countries on Mon Feb 15 20:02:08 CST 1999
subscribe/unsubscribe with that Subject: to telecine-request at alegria.com
complete information on the TIG website http://www.alegria.com/tig3/