An enlarger
consists of:
Enlarger for 35mmm negs only. with out multigrade head. Condenser type. |
A baseboard on
which enlargements are made; a column, which serves as a slide for
the support arm, that holds the enlarging head, which consists of the
lamp housing that contains the bulb; a single or double condenser;
negative carrier, a place to fix the lens; a means of focusing and
lastly a red filter that swings in front of the lens.
The lamp
contained in the light housing is of the opal type and has a power
output of 75, 100 or 150 watts. The pearlescents of the bulb with the
help of a condenser distributes the light evenly across the negative.
The lens focuses and projects the negative image on to the baseboard
or rather an easel with paper on it. The higher the enlarging head is
from the baseboard the closer the lens is to the negative the greater
the magnification. The closer the head is to the baseboard the
greater the distance the negative is from the lens the smaller the
magnification of the picture. The typical focal length of lens for
35mm negative is 50mm and for a medium format (6x6) is about 75mm.
A multi format Enlarger with multi grade head. Diffuser type. |
The negative is
clamped in the carrier which incorporates a mask that is the same
size or format as the film and then placed in the light box. It is
not a good idea to cut the negatives into single frames, it is better
to leave them in strips to make it easier to line the frame up with
the mask in the carrier, this also means you are less likely to
scratched them.
Focusing is usually done manually, although there are enlargers available with automatic focus, these are usually more expensive.
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