Mamiya C330f Professional Repair Manual download pdf (Page 25)

Mamiya TLR Summary 25

Weight (grams)

Flash synchronisation

X,M

Other characteristics

Early versions may require modification for auto-cocking on later bodies.

Originally had chrome filter thread guard rings. Telephoto design.

4 Black series lenses

4.0 Introduction

The black series lenses were introduced with the C220 and C330, c.1969, though there is a reference to the 55mm and 250mm

alongside the C22/C33 as early as March 1967. The shutter is labelled Seiko (except for the 80mm f3.7, which is a Copal), and is all

black. There are two designs of Seiko shutter which are only externally distinguished by the aperture click-stops on the later versions.

Mamiya (America) announced in 1999 that some new parts for early Seiko shutters were exhausted and that they would not be able to

undertake repairs.

Some lenses are labelled ‘Seiko’ and some ‘Seiko – SLV’ (examples of 180mm Super and 55mm are known).

Some, but certainly not all, black lenses have optical multi-coatings. Exactly what coatings were applied and to which lenses is a

matter of debate. Given the number of years of production this isn’t too surprising.

Both the shutter speed scale and aperture scales read against a common index mark on the left of the lens. Shutter adjustment is via a

wide knurled ring, and apertures are set using a large knob on the right side of the lens opposite the scale. Speeds 1 - 1/500 + B.

There is some variation in specification within this group. The earliest versions (1960’s) have the focal length given in centimetres

(cm), and the last versions (from around 1980) had click-stops for the full aperture values. Mid-production lenses (1970’s) were

without aperture click-stops, and had the focal length engraved in millimetres. There are also some variations in the style of script

used for lens markings, but it hasn’t been possible to assign a date to these differences.

It seems that all lenses with 49mm filter threads were originally supplied with chrome 'keeper' rings to stiffen and protect the thin

alloy mountings. Not surprisingly these are often absent now. These have concentric ribs inside that are often mistaken for a (strange)

filter thread. Some lenses, such as the early 80mm, have a chrome cosmetic ring around the outside of the filter thread, which should

not be mistaken for a keeper ring.

This collection of lenses (jpg/lenses.jpg) shows the relative size of the various focal lengths in the black series. The 65mm is missing,

as I was unable to locate one when the photograph was made. Front row, left to right: 105mm DS, 80mm (with dented viewing lens

thread), and 55mm. Rear row, left to right: 250mm, 180mm Super (with keeper rings mounted), and 135mm. Note that some lenses

have haze/UV filters fitted.

4.1 55mm f4.5

Composition

9 elements, 7 groups

Picture angle

70 degrees 30 minutes

Minimum aperture

f22

Filter diameter (mm)

Lens hood diameter (mm)

Closest focus (cm)

Subject coverage and reproduction

ratio at closest focus (cm)

6.4 x 6.4 1 to 1.14

Weight (grams)

360

Flash synchronisation

X,M

Other characteristics

Retrofocus design. Cited in an American distributor's catalogue as early as 30th

March 1967, but actual availability is unknown. An insert for the finder bases

was produced to provide corrected parallax and exposure indices. See section

6.4

4.2 65mm f3.5

Composition

6 elements, 5 groups

Picture angle

63 degrees

Minimum aperture

f32

Filter diameter (mm)

Lens hood diameter (mm)

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 53 54

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Mamiya C330f Professional Repair Manual Page 25

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