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accurately angle aperture appear areas arranged beneath the enlarger black background bulb camera centimetres clear colour combination contact printing contrast cut-out dark tone dark-room density depth of focus diffusion dioptre direction disc distance distortion double exposure edges effect emulsion exposed film filter flat focal length focusing screen fogging gelatine give glass grey ground half Hugo van Wadenoyen inches lens less light lines mask material matt surface method mirror montage natural nearer negative normal lens objects obscured obtained opaque paper negative pattern photogram photographic photomontage picture placed plane plate position possible printing paper produce projected recorded reflection reflector repeated reversed scale scene second exposure sensitive separate shape sharp sheet of printing side similar simple soft solarisation success suggest suitable surface table-top technique texture thin tilted transparency vertical wide-angle lens witch ball