Additional Information on:
Canon Pellix QL / FT QL Cameras


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Canon Pellix QL.jpg (17k)
The Pellix, first marketed in 1965. It was Canon's first 35mm Focal-Plane Shutter SLR Camera with TTL metering. It was also the first commercial production SLR that was incorporated with a fixed Pellicle mirror. It employed with a super-thin, a semi-transparent film only 20/1000 mm thick was used as a fixed mirror. Since there was no mirror blackout, the user could see the image at the moment of exposure. The 'QL' means 'Quick Loading'. A Canon designed film loading method also used in other older bodies such as FT QL, FTb QL. Similar concept was introduced in Canon AL-1 QL (1982) and the more popular T series models from the program-only Canon T-50 in 1983 (Other T-60 in 1991).

The potential of the Pellicle mirror 'theory' was not so much emphasized at image black out by camera designers but it solves a engineering problem at the rapid return mirror mechanism during high speed shooting. The first high successful application was reported the Olympic Games at Sapporo in 1972 with the
Canon F-1 High Speed Motor camera developed exclusively for taking rapidly moving subjects, and provides a shooting speed of either single, *four to nine frames per second and it was a big hit during the games. With an additional advantage of a viewfinder where one is able to see and track the subject all the time.

However, the development of the full aperture metering was still not available, instead, a stopped-down, TTL exposure meter used with 12% partial metering at the viewfinder center. It was hailed for its accuracy and reliability. As with any current top end camera like Canon's EOS-1n RS, or the
Canon New F-1 High Speed Motor Camera or the 5 fps autofocus Canon EOS RT of 1989, the fixed pellicle mirror reduced the amount of light reaching the film. In the case of the Pellix, it was by one-third of a stop. Therefore an f/1.2 lens was like an f/1.4 lens and an f/1.4 acted like f/1.7. However since the image could be viewed through the viewfinder even during long exposure time or even during multiple flash or repeating flash setup. Further, since there is no mirror bounce, ultra high magnification, micro or astrophotography that required absolute vibration free operation can be a joy since you still can view the image during long exposure time that was previously un-dreamed of in a mirror lock up situation.

Canon's 'EOS-1n RS' is Canon current top-of-the-line camera that also utilizes a Pellicle Mirror for high speed photography (10 fps). There are more advantages or potential for the pellicle mirror technologies to go further in the future, so you can rest assure the RS is not the last model from Canon ....

SLRs that also use a fixed Pellicle mirror featureing in the PIM site: Canon F-1 High Speed, 1972, New Canon F-1 High Speed, 1984, Nikon F High Speed, Nikon F2 High Speed, 1984, Nikon F3 High Speed, 1997 and EOS-1RS.

Is the Pellix all about Pellicle Mirror ? Not quite. It fact, another feature was in a form a an accessory that shares with the Canon FT QL in 1966. It was called a "Booster". An metering device that enhanced the metering capability of the Pellix QL and FT QL that actually can put many of today's modern camera to shame !

Dual.jpg (15k)
To avoid confusion, the Booster is an added on accessory. The pix at the left shown was a Pellix QL model with and without the Canon's Booster attached.
This excellent accessory acts as a powerful aid to the CdS photocell in registering the faintest trace of light in dim surroundings. By attaching the BOOSTER on to either the Pellix QL and FT QL , you can get precise readings in almost total darkness. Tests have proved the effectiveness of this combination of CdS photocell plus BOOSTER. Pictures taken at night under the most adverse lighting conditions proved to be as sharp and clear as daytime shots under the best possible conditions.

Canon Booster.jpg (8k)
What's more, the versatile CANON PELLIX QL with BOOSTER can take film speeds from ASA 25 to an unbelievable ASA 12,800. The light-measuring range of the PELLIX QL is increased from a low of EV- 4.5 (Minus 4.5), f/1.2 30 seconds to EV 18 with ASA 100 film compared to a low of EV 2 in most competitive SLR cameras available during that era (I think many makers, including Canon can keep quiet on this remark...hehe).

Pellix logo.gif

What this means is the Booster/Camera combination can open up for anyone to explore such specialized fields as macrophotography, oscillography, and microphotography. And do this without using any complex mathematical compensation or calculation on exposure time.

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