drive is necessary for the camera to function in shutter priority. TTL Flash was introduced on the Nikon F3 (1981) which was a direct competitor of the F1 New. For many this was considered as a considerable advantage although the ergonomics of the Nikon F3 with its liquid crystal display lacked the clarity of the Canon F1. Macro, micro and close-up photography A comprehensive set of close-up, macro and microphoto accessories was available for the F-1, including three bellows units, reversing rings and couplers, macro and micro photo hoods and couplers, copy stands, manual and automatic extension tubes and 3 different focal length macro lenses. Revisions In 1976, the camera was revised slightly. This revised version is sometimes called the F-1n (not to be confused with the 1981 New F-1). All told 13 improvements were made. These changes were: Change the standard focusing screen from the A style (microprism only) to E style (split image with microprism ring). Widen the film advance lever offset from 15 degrees to 30 degrees. Decrease the winding stroke from 180 degrees to 139 degrees. Increase the maximum ASA from 2000 to 3200. Added a plastic tip to the advance lever. Changed the mirror to transmit more blue light, thus making the image brighter. Added a detent to the rewind crank to allow it to stay put when pulled out. Added the capability to take a screw-in type PC sync socket. Spring load the battery check position of the power switch. Increase the size of the shutter release cup. Added a soft rubber ring around the eyepiece. Added a film reminder holder to the camera back. Simplify multiple exposure procedure. The number of focusing screens was also expanded from four to nine. In 1980 Canon introduced "Laser Matte" focusing screens identified by an "L" in a circle on the screen's label. These Laser Matte screens were noticeably brighter than the earlier screens, and they were continued with the New F-1. Special editions A special commemorative model of the F-1 was offered for the 1976 Montreal Olympics. It was identical to the regular F-1 but for the Olympic emblem on the front upper left of the body. Canon also manufactured and sold commemorative 55 mm and (much harder to find) 58 mm lens caps with the 1976 Montreal Olympics for their normal lenses in production at the time. For the 1980 Winter Olympics in Lake Placid,