Hello Trix,
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The housing of your Opemus-5 enlarger consists of two parts. (1) The base unit, which is the part connected to the column and where you insert the negative stage containing the film to be enlarged, and at the bottom you screw on the enlarger lens, and (2) mounted on top of this is a housing containing a light source, either a condenser light source, which is used for black-and-white enlargement (currently fitted in the photo), or a colour mixing head, which is used for colour papers or variable-contrast (multigrade) black-and-white paper (shown on the front of the base board in the photo). Unfortunately, the Meochrom colour mixing head with a round connection that you bought does not fit your base unit exactly (which has a square connection), as shown in the other photo. It is probably intended for a different Meopta model. The correct Meochrom unit would need to have a square connection.
Mirko and Urnes wanted to know whether you might perhaps own the condenser head (i.e. the lamp housing as seen here in the photo); this is the ‘standard equipment’ for these enlargers, so it is normally included with the purchase. With the condenser head, you could simply control the contrast of the photographic paper using filter sheets, which you insert into the filter drawer or hold beneath the lens. An extra colour-mixing head would then be superfluous. If you don’t own a condenser head for the Opemus 5 – that is, if you only have the basic unit you’ve shown with the mismatched colour-mixing head – you’d need to get hold of either a
suitable colour-mixing head (with a square connection) or a
suitable condenser head. However, the safest or simplest option is probably just to get a complete unit again, i.e. either one that includes a condenser head or one that includes a colour mixing head. It doesn’t cost the earth these days.
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