This makes the distance from the rear of the lens to the focal plane longer than the lens focal length. Retrofocus design has been adopted in wide angle lenses so the rear of the lens does not impede the movement of an SLR camera's reflex mirror. Retouching is an after treatment carried out on a negative or print, in the form of local chemical reduction, local dye or pencil additions or airbrushing. The purpose is to remove blemishes on the negative or print. Reversal materials are materials specifically designed to be processed to a positive after one camera exposure.
Ring flash is a ring shaped electronic flash unit attached to the front of a lens.
Used to give even frontal lighting in closeup situations. Rinse is a brief clean water wash between steps of a processing cycle to reduce carry-over of one solution into another. Rising front is a camera movement enabling the front lens panel to be raised or lowered from its central position on most view cameras. Robinson, Henry Peach 1830-1901. Outstanding English photographer of the period, famous for multiple-printed images of carefully constructed dramatic groups.