More Accessories, Cameras and Lenses
In 1956 several new
products were added to the growing range of accessories for the
||Viewfinders for 85mm, 90mm, 105mm, 135mm, and
150mm lenses were launched. They were direct-vision, non
optical types, and consisted of a cylinder with a three
sixteenths of an inch hole at one end to form the eyepiece,
the other end carrying a 2:3 proportional mask.
The equivalent focal length of each view finder
depended upon the length of the cylinder. They were finished to match
the camera and fitted into the accessory shoe. The cost of each
viewfinder was £2.1s.8d.
A lens hood and filter holder was produced to fit
onto Lumar lenses. It was turned and polished to match the lens, and
was a press fit over the inner ring of the lens
mount. The filter holder screwed apart to accept standard 31mm filters. The
price was £1.6s.3d.
Another new product was a set of four well made
extension tubes, each with a Leica thread. They were made of metal and
finished in black. The sizes were 52mm, 34mm, 26mm, and 18mm. They
gave reductions of 1:1, 2:3, 1:2, and 1:3 respectively. The price of
the set was £2.17s.8d. There was also a separate 10mm tube available
for a 1:4 reduction, priced at 8s.11d.
||The focus adapter was developed to assist in focusing and
composing the exact field of view from a lens. It was ideal
to use in
combination with the extension tubes for close-up work. It
consisted of a housing carrying a ground glass screen and a
lens flange. Their separation distance was the same as the
film to flange distance in the Periflex camera. In use the
adapter was screwed into a tripod with the lens fitted to it.
The lens was focused and the adapter was replaced by the
camera, care being taken, of course, not to disturb the focus
setting or the tripod. It sold for £2.17s.8d.
|The Corfield Microscope Adaptor allowed
microscope images to be photographed by a Periflex camera. It
had a built in focussing screen and a screw operated clamping
ring for attachment to a microscope.
The best selling Corfield product was the Periflex
camera. Its main competition was from Germany, but by 1956 German
camera prices were falling and so it was essential to redesign the
Periflex to ensure it retained its appeal.
In the new model, consideration was given to making the
camera easier to use, and John designed an automated periscope mechanism. The
periscope was automatically lowered each time the film was advanced,
and raised before the shutter fired. This greatly increased the
complexity of the mechanism, and meant that the camera had to be taller
to accommodate the extra mechanics. The taller body also meant that an
internal viewfinder could now be used. The new periscope was
completely housed inside the camera body, which had an extra eye-level
eyepiece on the back next to the one for the viewfinder.
Interchangeable objectives could be screwed onto the front of the
viewfinder to cater for lenses of different focal lengths.
The top and bottom plates were given a finer, more
durable finish, and the film wind and shutter speed controls were
neater and easier to handle. Winding the shutter and transporting the
film were now a simultaneous function of the film wind-on control,
which also positioned the periscope. All of this was done in just half
a turn, making for a very rapid action. The film speed dial was built
around the rewind knob at the left end of the top plate. The film
speed as set by the dial could be viewed in a third eyepiece that was
just to the right of the other two. The rewind knob pulled-up to
rewind the film. X and M flash synchronisation sockets were
mounted on the front panel next to the viewfinder.
||It was decided to retain the Periflex name as it
was so well known, and also to produce two versions, one
cheaper than the other. The cheaper version was to be called
the Periflex 2, and the more expensive version was to be the
Periflex 3. It was also decided, that it would be better to
regulate the rate of sales by releasing the more expensive
version first. Otherwise the initial demand for the cheaper
version alone could be too great for the company to handle.
The Periflex 3 was to be released first, followed by
the Periflex 2 which would supercede the original camera.
||The view of a Periflex 3 from the top with the
The standard lens was a 4 element 45mm f2.8 Lumax. The
Lanthanum glass elements were made by Enna Werk in Germany to a very
high standard. One interesting feature is a very wide focus adjustment
which allows the lens to focus down to 12 inches, making this a very
early macro lens. Other Corfield lenses available for the camera at
this time were the 45mm f1.9 and the 35mm f3.5 Lumaxes, the 50mm f3.5
Lumar-X, and the 100mm f4 Lumar.
||The camera was released in April 1957, and with
a 45mm f2.8 Lumax lens sold for £79.6s.0d. The 35mm lens,
known as the Retro-Lumax, cost £33.17s.6d. Additional
viewfinder objectives were £1.19s.6d each, except for the
35mm version which was £2.15s.0d. A well designed ever ready
case was also available.
|Also released at the same time was the Perilite
electronic flashgun. It was very compact and light in weight,
consisting of a flash head with an integral power supply
housed in the handle.
|| The power supply consisted of eight B.156
batteries which charged an internal 1000 micro farad capacitor
to 240 volts. The flash tube was a F.A.12 which gave a flash
duration of about 1/500 sec. The power output was 35 joules. A
set of batteries was quite expensive at 26 shillings, but this
would give a guaranteed 800 flashes. The flash weighed-in at
one and a half pounds and sold for £12.12s.0d.
||The Periflex 2 finally appeared in 1958. It superceded
the original Periflex, and was built to the same high standard as the
Periflex 3, with only minor differences. The maximum shutter speed was
1/500 sec instead of 1/1000 sec, the film speed indicator was removed,
and the viewfinder objective was fixed. Other viewfinders could be
fitted into the accessory shoe as on the original Periflex.
||The camera top plate showing the clean styling.
The shutter speed dial and film rewind knob are on the left.
The film wind knob and film counter are on the right.
|The Periflex 2 showing the bottom of the
automatically lowered and raised periscope
|A Periflex back showing the patented glass film
|A Periflex 2 with its back cover removed. On the
right is the sprocket-less film drive which was a feature of
all Corfield cameras.
camera, with a 45mm f3.5 Lumax lens sold for £23. It was an instant
success and orders poured in.
to the beginning