Mamiya C330f Professional Reparaturanleitung PDF herunterladen (Seite 34)

Mamiya TLR Summary 34

compensation scale. This is the standard screen.

2. Rangefinder (split image), 4 degree spot Matted entire surface except centre horizontal split image and surrounding

annulus. Without exposure compensation scale according to some sources,

but includes it according to a C330f Focusing Screen insert.

3. Rangefinder (split image), 6 degree spot As 2, but incorporates exposure compensation scale. Split image

rangefinder is more sensitive. May not work well with longer (180mm

plus) lenses.

4. Microprism As 2, but with microprism in place of split image.

5. Cross hair (ground glass with cross in

central circular spot)

Matted entire surface with clear centre spot and cross-hair. Suggested for

close-up, dim views and astrophotography. To focus using this screen, use

a strong (x8-x10) magnifier and adjust the focus until the image remains

steady with respect to the cross-hair when the eye is moved from side to

side.

6. Checker / grid Matted entire surface with Fresnel lens except clear centre spot.

Incorporates exposure compensation scale.

7. Microprism / split image Introduced with the C330f. Apparently the same as the C330s Screen E.

7.1.1 Changing screens

Remove the finder, and rack the bellows out a short distance. At the front of the focusing screen mount is a small catch. Pull this

forward, towards the lens. The screen will lift off upwards and backwards. The screens are replaced by reversing the process.

Screens can be taken out of the metal frame, but it must be done with care. These screens are plastic underneath a clear glass, unlike

the glass fittings of older models.

7.2 C330f

These are the same as the C330 screens, but would have the exposure compensation scale as indicated in the previous section. Late

C330f's also had the option of a microprism / split image screen similar to the C330s Type E. This is designated as No.7, and

combines a microprism with a diagonal spit-image. These screens are acrylic resin, and are comparatively soft. Avoid contact with

solvents.

7.3 C330s

A range of seven screens was produced. Technically similar to the C330 equivalents.:

A. Matte. Matted entire surface backed by Fresnel lens except centre

spot. Exposure compensation scale.

A2. Matte for wide-angle lenses. Incorporates the 55/65mm parallax plate.

B. Rangefinder (split image), 4 degree spot.

B2. Rangefinder (split image), 6 degree spot.

C. Microprism.

D. Cross hair.

E. Microprism / split image.

Also available was a checked overlay screen for mounting between the focusing screen and the finder.

7.3.1 Changing screens

The screen release catch is to the rear of the screen, and the screen frame hinges up at the front. The screen is positioned into the

revealed recess, the frame lowered, and secured.

8 Sheet film back

8.1 Single Exposure Backs

There appears to have been at least three models. The original C2/C3 version (Model 1) and a later design that was used with the

C22/C33 (Model 2 for C22/C33, rubber ‘M’ covering) and the C330/C330f (Model 2 for C330, leatherette covering). This last design

came in two versions differing in the attachment to the camera body (the C33 and C330 backs have different hinging mechanisms).

The C220, and C220f have fixed backs, and do not take a sheet film attachment. The C330s back is removable, but no alternatives to

the standard back are known at this time.

It appears that the holders for the Model 2 variants are not compatible. The C330 version has two registration pins that match recesses

in the film holders. So you can use late film holders in early Model 2 backs, but not vice versa, unless you are prepared to remove the

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