= 12. Semi-Interquartile Range. The semi-interquartile range of a distribution is half the difference between the upper and lower quartiles, or half the interquartile range. Therefore, from the example above, it was determined that the interquartile range = 12.
Electronic Viewfinders (EVFs) An EVF is basically a very small screen inside a viewfinder, so you can put your eye up to the viewfinder and use it like a traditional camera. On most cameras with EVFs you can switch the view between the viewfinder and the rear LCD screen interchangeably.
A rangefinder works by having 2 windows that view the subject a slight distance apart. One creates the direct view image in your viewfinder, the other creates a center spot (a small area superimposed on the main image) that's used to focus-this spot is usually somewhat illuminated.ost varieties of rangefinder show two images of the same subject, one of which moves when a calibrated wheel is turned; when the two images coincide and fuse into one, the distance can be read off the wheel. More on camera rangefinders http://www.ehow.com/how-does_4926163_ran...