MICROPRISM COLLAR - Focusing aid in a viewfinder screen composed of small glass or plastic multiple prisms. An image that is in focus appears sharp and clear; an out-of-focus image has a broken-up, shimmery appearance.
Microprism collar is a grid type ring found in the center of a camera focusing screen, usually surrounding a split image screen.
Millimicron (mµ) is one thousandth part of a micron.
In fact, it has a split circle in the centre of the screen and a ring of microprisms (microprism collar) around it. So if it's too dark or you can't find a decent high-contrast line you can try the microprisms instead.
vertically arranged +/-/- light emitting diodes (LEDs) on the left side of the viewfinder to indicate the readings of the meter versus the actual camera settings. The focusing screen also has 3 mm split image rangefinder and 1 mm microprism collar ...
 See also: Camera, Exposure, Lenses, Light, Finder
  
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