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Interview With Otto Blaschek
Head of the ARRIFLEX 765 designers' team

The 70mm Newsletter
Written by: Alexander Felsenberg, ARRI München, 1989. Prepared for in70mm.com by Anders M. Olsson, Lund, SwedenDate: 01.01.2013
The ARRI 765, 2009

Otto Blaschek, born in 1921, studied mechanical engineering. His successful career with Arnold & Richter started in 1947. The many different sides of this technique have always filled him with enthusiasm, up to the present day.

Under the wings of Academy Award Winner Erich Kästner, he took his first steps as camera designer: The very successful ARRIFLEX 16 St came into being. His creativity and the constant search for improvement of the existing, helped Otto Blaschek to set new standards in camera technique.

In his capacity as development- and project leader he conceived the ARRIFLEX 16 BL, the ARRITECHNO and the ARRIFLEX 35 BL III. Also the ARRIFLEX 35 III, for which he won the "Scientific and Engineering Award" of the Academy of Motion Pictures and Sciences in 1989, bears his trademark.

His special field is the development of new movements and of noise-reducing measures. It is primarily this topic where he set new standards. During his 43 years of career as camera designer with Arnold & Richter, he applied for approximately 30 patents.

The concept of the ARRIFLEX 765 is seen by himself as the "high-point" of his career. His lifetime technical experience and know-how was put into this camera. He and his team went new ways in conceiving movement, mirror shutter control and camera drive system until these innovations were ready to go into production.

Alexander Felsenberg: Mr. Blaschek, when did you start with the development of the ARRIFLEX 765 and what was the immediate cause?

Otto Blaschek: Our market research and intensive discussions started in 1983, and it was our US subsidiary, Arriflex Corporation that contributed to this to a great extent. With the help of this corporation we have the best possible access to the main production market per se.

We noticed that there was an ever increasing demand for films which stand out from the others also in a technical way. Just think of Stanley Kubricks' famous "2001", Leans' "Lawrence of Arabia", "The King and I" etc which were, apart from their cinematic quality, especially effective because of the large-screen presentation. The increasing number of 70 mm blow-up prints made from 35 mm anamorphic originals signaled a trend that could not be ignored. Of course, the quality of a 65 mm original with spherical lenses is by far superior to that of 35 mm blow-ups.

In the beginning, there was a "request list" which, later on, served as design requirements: Most of all, the camera was to be quiet, that means completely suitable for sync sound recording. At the same time, a "bearable" weight was important as well. To make it a universal camera, the frame rate had to range up to 100 fps. A convenient mirror reflex viewfinder, a complete range of lenses and accessories was also considered a must. In short, the camera had to fit smoothly and without a big change for the cameraman, in the 35 mm ergonomy.

During all that period, there was a continuous exchange of experiences with cameramen. Their experience and suggestions for improvement were taken up and introduced in our project.
More in 70mm reading:

A Visit to ARRI in München

Films photographed with the ARRI 765

Making of BMW 850i

A film on historic scaling of Nanga Parbat

On Location in Paris with ARRI 765

The Work of Jan Jacobsen

In the Movies with Gerhard Fromm

The M.C.S.-70 Process and European Cinema of the 1960s

Interview With Otto Blaschek (PDF)

Internet link:

ARRI Group

ARRI 765

Academy Award for the The ARRI 765
Scientific and Engineering Award to Arnold & Richter, Otto Blaschek and the engineering department of ARRI Austria for the design and development of the ARRIFLEX 765 camera system, for 65mm motion picture photography

Presented: March 6, 1993
"Tour Eiffel" with ARRI 765

Alexander Felsenberg: What was the basis of your design?

Otto Blaschek:

Before starting the new design, it was important to have a close look at the 65 mm cameras already in existence and on the market and to talk to people who had been working with these cameras. So I was able to learn about the problems of the earlier models.

In most cases, the earlier camera models were not completely suitable for sync sound recording. Sometimes, their noise-level was as high as approximately 50 dBA at a frame rate of 25 fps. It goes without saying that this eliminated simultaneous sync sound shooting. In many cases, these camera were also extremely heavy and bulky so, filming with same was not so simple and involved great efforts.

As far as the technical side is concerned, frame rates up to 60 fps were possible, however, the entire movement had to be oiled after each take so that it could stand up to the extreme load. Another problem was winding-up of the wider and thus heavier film stock. There were frequent break-downs. Generally speaking, operational dependability was not guaranteed to such an extent that you are used to with nowaday's professional 35 mm cine cameras.

These were some of the reasons why there were no more "big films" shot in the 65 mm format during the past years. Technology was simply not perfected enough. This is, where we saw our prospects.

Alexander Felsenberg: How did the development of this camera proceed?

Otto Blaschek:

For such a big and committed project it was necessary to form a new developing team. Therefore, we searched for a team that could draw up and continue my design outlines. It was in Vienna where we finally found the required precision-mechanic infrastructure and the necessary know-how. In November 1985 we started to build up the new developing center in Vienna under the leadership of Kurt Ropin: ARRI AUSTRIA was founded.

In the meantime, I was busy to finalize the design outlines. In March of 1986 I could present the final draft. These outlines included ARRI's entire technical knowledge and now-how in manufacturing motion picture cameras.

Then, the new team in Vienna started to work: It took us only one year to manufacture a functioning camera in open construction. Movement, pre- and post winding, film gate etc could now be tested in the field. After three years, five ARRIFLEX 765 cameras were assembled.
Alexander Felsenberg: What were the problems with the development of the new camera?

Otto Blaschek:

Quiet running of the entire camera was important for shooting with sync sound. We developed a completely new drive system with two crystal controlled motors in the camera and two further motors in the film magazine.

The considerably wider and thus heavier film stock represented a very special challenge for design and construction:

A 300 m (1000 ft) roll of film stock weighs approximately 4.5 kg (10 lbs). This mass has to be reliably and precisely accelerated and braked even at a frame rate of 100 fps, without developing slack film. For this, an electronic motor control provides highest reliability for a constant film traction.

There had always been problems with the claw movements of the earlier camera models with respect to maintenance and reliability during filming, so we were confronted with the problem to make the claw system of the ARRIFLEX 765 as wear and tear resistant as possible and to ensure high frame rates.

So to speak, we "reinvented the wheel". With this extensive new design of the claw movement we replaced the slide bearings by ball bearings. By this, the system is maintenance free over a long period, that means at least for the entire production.

When considering the total structure of the movement, we also included in our consideration the question of maintenance and ease of servicing: For replacing parts it is not necessary to dismantle the movement completely. The parts in question can be removed and replaced in a simple way by plugging on the new parts. This is an immense advantage for camera rental and service.

Some of the earlier camera models were designed without a mirror reflex viewfinder and did not allow an exact image control. It was our aim to form this "control center" of the cameraman conveniently and in accordance with today's state of the art. Great importance was attached to a bright viewfinder image with large, visible surrounding area outside the format markings.

This also required new ways in designing and manufacturing the mirror shutter. It is now made of 0.8 mm thick silicon and has a diameter of approximately 200 mm. This size and the material chosen by us has proved to be optimal for various reasons: On the one hand it yields a bright and large viewfinder image and on the other hand it enables, together with the electronic motor control of the mirror shutter, an exact exposure, unequaled by any competitor.
"The International" with ARRI 765

Alexander Felsenberg: How does the coordination of the mechanics and the electronics work?

Otto Blaschek:

The electronics have the advantage of being absolutely wear and tear resistant. Even after years, all values are maintained as exactly as during the first hour of operation. Thus, our high precision mechanical camera manufacture is optimally supported by an electronic control.

Mirror shutter, claw movement and film winding are driven by separate motors, this means that there is no mechanical connection between these parts, resulting in an extremely quiet camera run.

In addition, this mechanical decoupling ensures perfectly even running of the individual motors and thus of the complete functional unit "camera".

Alexander Felsenberg: Were there any basic changes made in the course of the test phase?

Otto Blaschek:

Of course, we improved this or that detail, however, there was not a single point in the design which needed to be changed entirely. Our camera concept was conclusive right from the beginning.

Alexander Felsenberg: In what direction do you continue your development?

Otto Blaschek:

At the moment we continue to work on the accessory program. A zoom lens with 38 to 210 mm focal length (T6.3) will be added, also a variable speed unit and a lens control unit which allow external electronic remote control of focal length, as well as focus and diaphragm control. The potentials of the ARRIFLEX 765 are far reaching beyond today into the future.

However, as you know: An engineer should never be content with the present state of the art. As in the past, we'll learn from experience on location. This will point the way in the right direction.

Alexander Felsenberg: Mr. Blaschek, I thank you for this interview.

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Updated 21-01-24