F-number lengths. Therefore, reduced–depth-of-field effects will require smaller f-numbers when using small-format cameras than when using larger-format cameras. Image sharpness is related to f/number through two different optical effects: aberration, due to imperfect lens design, and diffraction which is due to the wave nature of light. The blur optimal f-stop varies with the lens design. For modern standard lenses having 6 or 7 elements, the sharpest image is often obtained around 5.6–8, while for older standard lenses having only 4 elements (Tessar formula) stopping to 11 will give the sharpest image. The larger number of elements in modern lenses allow the
Dart golf Howard Hanson for a dartboard where the numbers are in a different order than the standard dartboard to make playing golf on the board more like playing a golf course. Finally, Dolf was developed on September 1, 1999 in Winnipeg, Manitoba, Canada by Keith Meyer and Michael Meyer where a golf like game is played on a standard dart board. Dolf is regulated by the World Dolf Federation (WDFF) with representation in Canada and Pakistan. The dartboards used to play dart golf games consist of 3 major categories. First are dartboards that are representations of golf courses. Second are dartboards