“Almost like a real web site”
 

IN7OMM.COM
Search | Contact
News | e-News |
Rumour Mill | Stories
Foreign Language
in70mm.com auf Deutsch

WHAT'S ON IN 7OMM?

7OMM FESTIVAL
Todd-AO Festival
KRRR! 7OMM Seminar
GIFF 70, Gentofte
Oslo 7OMM Festival
Widescreen Weekend

TODD-AO
Premiere | Films
People | Equipment
Library | Cinemas
Todd-AO Projector
Distortion Correcting

PANAVISION
Ultra Panavision 70
Super Panavision 70
 

VISION, SCOPE & RAMA
1926 Natural Vision
1929 Grandeur
1930 Magnifilm
1930 Realife
1930 Vitascope
1952 Cinerama
1953 CinemaScope
1955 Todd-AO
1955 Circle Vision 360
1956 CinemaScope 55
1957 Ultra Panavision 70
1958 Cinemiracle
1958 Kinopanorama
1959 Super Panavision 70
1959 Super Technirama 70
1960 Smell-O-Vision
1961 Sovscope 70
1962
Cinerama 360
1962 MCS-70
1963 70mm Blow Up
1963 Circarama
1963 Circlorama
1966 Dimension 150
1966
Stereo-70
1967 DEFA 70
1967 Pik-A-Movie
1970 IMAX / Omnimax
1974 Cinema 180
1974 SENSURROUND
1976 Dolby Stereo
1984 Showscan
1984 Swissorama
1986 iWERKS
1989 ARRI 765
1990 CDS
1994 DTS / Datasat
2001 Super Dimension 70
2018 Magellan 65

Various Large format | 70mm to 3-strip | 3-strip to 70mm | Specialty Large Format | Special Effects in 65mm | ARC-120 | Super Dimension 70Early Large Format
7OMM Premiere in Chronological Order

7OMM FILM & CINEMA

Australia | Brazil
Canada | Denmark
England | France
Germany | Iran
Mexico | Norway
Sweden | Turkey
USA

LIBRARY
7OMM Projectors
People | Eulogy
65mm/70mm Workshop
The 7OMM Newsletter
Back issue | PDF
Academy of the WSW

7OMM NEWS
• 2026 | 2025 | 2024
2023 | 2022 | 2021
2020 | 2019 | 2018
2017 | 2016 | 2015
2014 | 2013 | 2012
2011 | 2010 | 2009
2008 | 2007 | 2006
2005 | 2004 | 2003
2002 | 2001 | 2000
1999 | 1998 | 1997
1996 | 1995 | 1994
 

in70mm.com Mission:
• To record the history of the large format movies and the 70mm cinemas as remembered by the people who worked with the films. Both during making and during running the films in projection rooms and as the audience, looking at the curved screen.
in70mm.com, a unique internet based magazine, with articles about 70mm cinemas, 70mm people, 70mm films, 70mm sound, 70mm film credits, 70mm history and 70mm technology. Readers and fans of 70mm are always welcome to contribute.

Disclaimer | Updates
Support us
Testimonials
Table of Content
 

 
 
Extracts and longer parts of in70mm.com may be reprinted with the written permission from the editor.
Copyright ę 1800 - 2070. All rights reserved.

Visit biografmuseet.dk about Danish cinemas

 

Modernizing the DP70
The Story of the Todd-AO Projector

Read more at in70mm.com
 
Written by: Thomas Hauerslev Date: 14.08.2019
DP70 with internal DTS reader. Image by Mark Gulbrandsen

From the beginning more than 50 years ago, the DP70 has been considered one of the best projectors ever made. Despite that, Philips continued to improve the machine until production ended around 1966. Since then, and especially in the 1990s, the DP70 is still being upgraded, by Kinoton and other private enterprises.

This page will show some examples.

DP70 RED-LED reverse scanner
 
More in 70mm reading:

DP70 / Universal 70-35 / Norelco AAII - The Todd-AO Projector


Todd-AO
70mm Projectors


Internet link:


kinoton.de
Philips Museum
 
A reverse scan modification is available from Claco Equipment and Services (USA). It is based on the original soundhead/ stabilizer and is the only reverse scan modification that allows use of the no-contact sound drum as designed by Phillips. It also allows the use of DP70 machines with the Cyan Dye soundtracks.

The GST LED reverse scan/Jax Light combination allows another full octave of high frequency through to the processor extending hf response to 16kHz with little or no slit loss compensation at all. This upgrade, as well as Kinoton's Dolby Digital upgrade makes it very difficult to tell if you are listening to analog SR or digital in many cases. See DP70 RED-LED reverse scanner
 
 
DP70 with reverse scan head. By internal DTS reader. Image by Gerard Bierling

I did this reverse scan for the DP70 and can tell you that this photo was taken during the first test in Bioscoop Catharijne in Utrecht which was a success and I made another 4.

Gerard Bierling's DP70 reverse scanner

 
 

870 Special Venue

 
Projector no. 1754 converted to the 870 format by CinÚ MatÚriÚl in Paris, France. Note missing magnetic cluster and enlarged sprocket. Picture by Francois CARRIN.

There are at least two examples of DP70's which have been converted to the 870 format. One 870 DP70 projector was offered at a price of USD 9995.00 dollars from Vistascope Corporation in Atlanta, Georgia, USA and another (SN: 1754) from CinÚ MatÚriÚl in Paris.

 
 

Lens Turrent

 
Some machines in Austria have been equipped with lens turrents

DP70s in Austria

 
 

The Align-O-Tron

 
laser2.jpg - 29710 BytesHow to align your lamp house with the Align-O-Tron by Greg MŘller
 
 

DP70 special digital reader bracket

 
DP70 special reader bracket for mounting digital sound heads. Seen here are the DTS and Dolby readers.

 
 

Cinefocus (no longer available)

 
The Century Cinefocus system applied just slightly positive air pressure to the film from an outboard blower to keep it from rapidly fluttering when the heat from large arc lamps would hit the film.

Obsolete technology. See more

 
 

Photo mask by Todd-AO
To boost the high end output to 0dB at 12.5K and -1dB at 16K. (No longer available)

 
Newly developed photographic slit masks for the DP70 optical sound head enable the DP70 to faithfully reproduce audio up to 12.5 kHz at 0dB with little slit loss compensation added in the pre-amplifier stage. This is equivalent to a half-mil slit or less in a forward scan sound head. 

The original brass slits were expensive to manufacture; it was difficult to obtain clean and straight edges on the sides of the slit, so they were limited in their high-frequency output. Not only do the new photo slits capture the high-end frequencies of modern stereo optical sound tracks, they are inexpensive and easy to install.

Photo mask by Todd-AO to boost the high end output to 0dB at 12.5K and -1dB at 16K.
 
 

A new film gate for the DP70 projector

 
Rosbeek Techniek in Holland have made a new 35mm film gate for the DP70. This will also be available for 70mm. It is made of black Delrin. The old one is a little flat at the gate because the film should run as flat as possible through the gate. The lenses back than were not so good as the lenses these days to perform under a little difficult situation what the flat part of the film gate is because the film can hardly run flat over a most bended film gate.

A new film gate for the DP70 projector
 
 
 
Go: back - top - news index
Updated 21-01-24