Showing posts with label meniscus. Show all posts
Showing posts with label meniscus. Show all posts

Wednesday, 1 May 2013

Bencini Comet 44

Comet 44, front view

This is a later development of the Comet line.  I also have a Comet S which is a half-frame camera.  This Comet is a full-frame camera.  It is a well designed and well made cheap camera.  In that respect it compares well with the Japanese Meisupii and Halina ranges which are not that well made. This is a 127 camera which takes square pictures 4 x 4 cm (hence the '44' in the name?).

The main body is made from cast aluminium alloy with an anodised finish.  Internally, there are some aluminium plates as well.  The back, which is also aluminium, comes away entirely to load the film.

The lens is marked as Bencini Acromatic 5.5 cm, f8.  The lens is actually a simple single meniscus lens.  In this camera, the lens is loose because someone has attempted to dismantle the camera.  Unfortunately, it is not possible to tighten the lens without a special tool which I do not have.

The shutter is a simple shutter with two speeds - 1/100 and 1/50 - and includes flash synchronisation.  The flash sync. mechanism is rather crude and is unlikely to work with electronic flash.

On the top plate on the left is the spool release to allow the insertion of a new roll of film - this is pulled up while putting the film in or taking the used spool out.  It is spring loaded to keep the film securely in place.
Comet 44, top view

Next to the spool release is an accessory shoe with a large chrome spring.  Next to this is the shutter release.  This is nicely placed for the index finger.  The last item on the top plate is a knurled chrome knob to advance the film.  This also pulls up to allow the insertion of an empty spool and removal of the finished film.

In the centre of the top is a bright yellow viewfinder.  That is, it looks yellow until you use it but looking through it, it is purple.  As is usual with roll film cameras, there is a red window on the back to allow you to see the frame numbers when you are winding the film on.

Friday, 26 April 2013

Tougo-do Meisupii J

Meisupii J
This is a small, cheap Japanese camera dating from 1951.  The camera is 104 x 70 x 59 mm and weighs 190g - this is quite light and is due to the aluminium alloy construction.  The only part that is not aluminium is the shutter which is brass.  The basic physical design is the one common to many cameras of the period and is loosely (very loosely) based on the Leica, the sine qua non of camera design of the time.  The following three photographs show the general similarity in outline and layout.
Leica IIIf (c) Rei Shinozuka

Halina 35X
Meisupii J


This  even extends to a small splash of red, in this case the letter 'J', in remembrance of the Leica's red dot.

The Meisupii J has a number of knurled knobs and rings giving the impression that things can be adjusted.  of then two knobs on the top plate, only one turns - the film advance.  The two knurled knobs on the base plate do not turn and the two knurled rings on the lens/shutter housing also do not turn.

There are adjustments, however.  There are two shutter speeds - I and B.  I is Instantaneous and B is Bulb.  Instantaneous is around 1/50 seconds and B, as usual, leaves the shutter open while the release is depressed.  The release button almost gives the impression that it is threaded for a cable release but it is not.

Also adjustable is the aperture with two f-stops - f8 and f11.  These are Waterhouse stops - holes in a moveable metal plate - rather than an iris diaphragm.  These holes have clearly been punched rather than drilled as the f8 stop is not quite circular.

The lens is a meniscus lens as far as I can see and does not appear to be coated.  The lens fascia is inscribed 'Meisupii 35' which suggests a 35mm lens which is slightly wide angled for 35mm film.

This camera takes Bolta film which is unperforated 35mm film wound onto a spool with backing paper like 120 film.  This was introduced in Germany in 1936 at as time when 35mm film was becoming popular but was not yet readily available in pre-filled cassettes.  Bolta format film was introduced into Japan in the late 1930s as Boltax film and was used until the late 1950s.

As with 120 film, the frame positions are indicated on the backing paper with numbers viewed through a window on the camera back.  Strangely, this window is coloured green rather than the usual red although with the introduction of panchromatic film (which was the usual film by 1951) the colour of the window is immaterial.

Friday, 30 November 2012

Six-20 Brownie D


Kodak SIX-20 brownie D
This must be the simplest camera that I have.  It is a box camera from Kodak made between 1953 and 1957 in London.  It was also made in the USA.  It comes with two controls besides the shutter release.  First control is a choice between "I" (instantaneous) and "B" (bulb).  I would guess that Instantaneous is about 1/30 seconds - bulb is for as long as you hold the shutter release in.  The second control is a close up lens which allows focussing between three feet and six feet.

Side view showing both control options
The camera has two viewfinders, both 'brilliant' finders, one on the top for portraits and one on the side for landscapes.  Given that the close-up lens allows focussing up to six feet, it is fair to assume that normal focussing range is six feet to infinity.

This camera takes 620 film which is no longer available.  However, it is the same as 120 film but on a different spool - so if I wanted to use this camera, I could re-spool some 120 film onto one of my 620 spools.  I shall not be bothering.

To load the film, the back is opened, the winder knob pulled out, and the insides of the camera come away in one piece.   The film is wound onto the inset and the inset replaced into the camera and the back closed.  Now the film needs to be wound on until the number "1" appears in the red window.  Negative size is 6 x 9 cm so this camera will take eight photographs on one roll of film.

I can date this camera to within five years by the plastic winder knob and plastic shutter release.  These were introduced on the Six-20 Brownie D in 1953 and production ceased in 1957.  Kodak also offer flash contacts on the Six-20 Brownie D but these are not present on my specimen.  I can refine the date a bit by the fact that the catch for the back was also changed - from a more-or-less rectangular shape to a triangular shape.  My specimen still has the rectangular catch so will date from nearer to 1953 than to 1957.

As tiis is such a simple camera, there is not really any thing I can add other than to say that the camera still works well - the shutter mechanism (which is very simple) is as free as the day it was made.  For sixty years old that is more than I can say for myself.

Friday, 10 August 2012

Kodak Brownie Vecta

Kodak Brownie Vecta
Kodak had a long series of Brownie cameras.  These were the cheap and cheerful range and varied greatly over time. 

This article is about the Brownie Vecta which was made in the UK and presumably only available here.  I was given one of these for a birthday present when I was was eleven or twelve years old when it was a strikingly modern looking camera.  It was designed for Kodak by the British industrial designer Kenneth Grange and its 'natural' format is portrait as that is what Kenneth Grange assumed it would mostly be used for.

The Vecta was only in production for three years (from 1963 to 1966).  It is basically a grey plastic cuboid with a central lens and a viewfinder in one corner.  The shutter release is a white bar underneath the lens.  It takes 127 film which is hard to find nowadays but is still available (see Ag-photographic for supplies).

The lens is a simple meniscus lens with no focussing.  I have not been able to find out what the focal length of this lens is but it is significantly wide-angle for 127 film. It works by having a very small aperture - f14 - which gives a large depth of field. The big downside of this is that the camera has to have a slow shutter speed to compensate.  Kodak colour film produced at the time that this cameras was current had a speed of ASA 64 so we probably looking at a shutter speed of around 1/30 second.  My test film for this camera shows reasonable image quality at a print size of 4" by 6" (100mm by 150 mm) which is as large as they would have been printed in 1963.  In fact, the surviving pictures that I have from August 1968 were printed at 21/2 by 4 inches at which resolution the quality is fine.

Kodak also produced a 'supplementary' lens that fitted over the fixed lens that allowed close-ups to be taken.  I had one of these which had to be used with the printed instructions to get acceptable focussing distances.  This did not work too well as distances became critical and the viewfinder produced parallax errors so I never had a real idea of what I was actually photographing.  I gave up on using the close-up lens fairly quickly.

This camera was easy for a child to use - I certainly do not remember any problems in using it at age eleven or twelve.  There are indentations in the cube to facilitate holding the camera steady - and with a shutter speed of 1/30(ish) a steady hand is essential. I really enjoyed this camera as a child and still found it nice to use. The position of the shutter release and the fact that it is a bar rather than a button takes a bit of getting used to but nothing untoward. It was probably easier for me at age eleven as I had not then become used to using more sophisticated cameras and a bottom shutter release was all that I knew.

Test pictures from this camera:

Baggholm Road, Lincoln
Busker, High Street, Lincoln

 At this size they look OK but when enlarged (to beyond the size that was anticipated by the designers) the defects show up.  When putting the first roll of film through a "new" old camera, it is usual for the film to attract dirt from the recesses of the camera.  This shows up as black specs on the final print.  These pictures have instead white specs and very pronounced grain which suggests a film or processing fault.  I cannot tell which, but I am sure it is not the camera.


Busker, High Street, Lincoln - enlarged to show marks