|
SYBIL: an eccentrically British camera
|
||||||||||||||||||||||||||||||||||||||||||||||||
![]() |
|
Special Sybil with roll film holder |
Due to differing thicknessess , the focal planes of plate and roll film holder differ by about half an inch, so to ensure correct focusing a metal tab has to be pressed down and moved until the lens standard clicks into the correct position. From experience I can assure you that forgetting which position the standard is in results in disastrously out of focus negatives!
Double dark slides held plates: a convoluted roll film holder provided eight or sixteen exposures on 120 roll film. Film was wound on to the first frame under a ruby red window covered by a spring loaded flap, after which a ratchet and pawl system acted as frame counter. From about half way through the roll the wind knob became increasingly difficult to turn forcing it mangled the film. Because of this I never tried transparency films. Nor did I get around to using cut film in the double dark slide, by backing the film with cardboard having the same thickness as the intended plate.
Wonderfully simple and silent in operation, Newmans pneumatic shutter mechanism has a charming rusticity, exhibiting the marks made by craftsmens files and emery paper. |
Wonderfully simple and silent in operation, Newmans pneumatic shutter mechanism has a charming rusticity, exhibiting the marks made by craftsmens files and emery paper. Almost certainly signifying the parts were non-interchangeable, many parts have the number VII scratched on them. The black painted shutter lobes are pivoted at their centre and oscillate to and fro between the lens elements. Motive power is a helical spring concentric with the internal shaft of the capstan. A quadrant at their juncture bears a cut-out into which fits an arm coupled to the T-B-I lever, plus a spigot to which is attached a thin wire connected to a piston moving within a cylinder. At the cylinders end is a tapered pin connected to the shutter speed dial. The rate at which air is allowed to leak out of the cylinder determines the shutter speed. With the pin fully withdrawn the fastest speed of 1/150th second is obtained; as the pin is progressively inserted into the cylinder, the shutter speed lengthens, up to ? second.
![]() |
|
Ready for repair! |
The shutter lobes move slowly for slow speeds, accelerating as faster speeds are selected. The first one moves to uncover the lens opening, then the other covers it to terminate the exposure. The lobes are visible through the lens and carry the symbols + and O. Cocking the shutter is achieved by turning the capstan to be until it points to the same symbol. Except at the faster speed, where they open and close with a distinctive “click”, at the slow speeds the Sybils shutter is wonderfully silent the quietest I have ever used.
Before the Kaisers war Arthur Newman fitted the finest Zeiss lenses. After it, though Zeiss reputedly offered very advantageous terms, he rejected them in favour of the British lenses. I have read somewhere that Newmans advertisements claimed: The British camera with British lenses, 50 years after Sybils 112mm f4.5 Ross Xpres provided me with bitingly sharp and contrasty negatives
I was quoted £40 to repair the shutter. But knowing the shutters method of operation, and having seen photographs of its mechanism, I removed the lens panel from the bellows, ‘split it, to discover what I had suspected the helical spring had become detached. Because pneumatic shutters rely on air escaping at a pre-determined rate, they must be bone dry. I cleaned the cylinder and piston with alcohol, re-connected the helical spring, photographed the various pieces and painfully put a few half films through that wretched roll film holder
For me, Newman typified the essentially English eccentric entrepreneur, a few of whom in later years I came to know. He did not follow, let alone slavishly copy, German camera designs as British designers were later to do. If you compare the Sybil with its contemporary, the Zeiss Maximar with f4.5 Tessar, the Maximar was more pleasant to use, but optically its Tessar was demonstrably inferior to the Sybils Ross Xpres.
About us O Shop window O Search O News O Articles O Links O Get in touch