Mamiya C330f Professional Repair Manual download pdf (Page 4)

Mamiya TLR Summary 4

The C330 (and possibly the C330f and C330s) was also produced in an all-black finish to the bellows frame, in place of the more

common chrome. It doesn't seem to be very common, but if anyone can throw more light on this topic, it would be appreciated.

During the 1970’s there was a trend in the 35mm single lens reflex world to produce both chrome and black cameras. The black was

supposed to be the low visibility, ‘professional’ version. Ironically, the chrome finish wore considerably better!

Some cameras (C3s and others) appear to have had mid-grey leatherette instead of the mode common black. There was a vogue for

grey cameras in the 50’s and early 60’s, so Mamiya may well have produced some. Which models were involved, and how many were

produced is unclear.

The C330 (and probably later models) have a textured surface to the inside of the camera where the film baffle is located. The C220

and earlier models have matt black paint. The actual paint does vary between camera models. In theory the textured surface should

result in less internal reflections and better contrast. Since the film baffle has a covering of velvet, the bottom of this chamber is not

treated to the same extent.

It is becoming clear from various reports of ‘discrepancies’ between the cameras detailed here and actual examples in people’s

possession that these cameras are subject to numerous detail differences within a particular model. While all the details given are

based on inspected examples and original documentation, there may well exist still more combinations that haven’t been included.

Where possible, points of difference will be mentioned.

A pictorial guide in the form of a Mamiya system chart for the early production C330s can be found at

https://webfiles.berkeley.edu/~grahamp/mfaq/mamiyaC330systemchart.pdf . This is a Portable Document File. There are variations

between models – notably in terms of screens and single sheet backs – that are not noted in the diagram. Please refer to the text.

1.0.1 Focusing

All models use a rack and pinion focus bellows system providing around 56mm extension. The effective extension depends on the

initial amount required for infinity focus with individual lenses. Note that this is a twin bellows; the viewing and taking sections are

separated by an internal baffle. The distance scales apparently measure from the film plane. In the case of the C330 this lies

approximately 8mm forward of the camera back. There is no reference mark.

1.0.2 Focus scale plates

The original Mamiyaflex focusing scales ( jpg/cscales.jpg ) were superceded on other early models up to the C33, and including the

C220 and C220f, by engraved plates mounted on the bellows mounting frame. The selection of lens focal lengths on these plates does

vary between models, and even between examples of the same model. Some of these plates may be a retro-fit to enable the use of

later lenses.

1.0.3 Multi-exposure function

The multi-exposure control on the camera only serves to disengage the multiple exposure prevention facility and not the film advance.

This allows the shutter release(s) to operate repeatedly if the shutter is cocked manually on the second and subsequent exposure. This

is unlike most other cameras where the wind-on stroke cocks the shutter without moving the film.

The sequence is to expose the first frame, switch to ‘Multi’, manually re-cock the shutter and use the normal shutter release to make a

subsequent exposure. Reset the control to Single, and advance the film in the usual manner.

It is also possible to achive the same effect by manually tripping the lever on the shutter, but it isn’t as convenient to reach as the

standard shutter release.

1.0.4 Shutter idiosyncrasies

Some cameras are sensitive to 'first pressure' on the shutter release. This appears to trip the double exposure mechanism without

affecting the shutter. This behaviour may reflect the wear that the body has received. There are work-arounds involving the multi-

exposure control or manual triggering of the shutter, but it is best to be decisive about making the exposure.

A similar problem can arise with certain lenses that permit the shutter trip lever to move even if the lens is not cocked.

There is a 'feature' of the interlock mechanism that can cause unexpected problems. Early 120 colour film was often sold in 6

exposure lengths. This may have been due to either cost or the physical thickness of the film base and emulsion. In order to wind off

the film without going through a further 6 blank frames, the shutter release is held down on the first extra frame while the film is

wound off. The most likely use for this 'feature' is to allow an early film change when working with action subjects. It can be a

danger, as one or two users have discovered when using a locking cable release or auxiliary timer! Also see section 11.7 .

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Mamiya C330f Professional Repair Manual Page 4

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