![]() ![]() The course record was set in 1981 and still stands by J Wild in 15mins 53 seconds. The winning time this year 17min 18 second by number 169 Bob Hope. A gruelling run, distance: 5.2km / 3.2mĬlimb: 213m / 699 ft. This rule for full f stops only requires that you can double, or half, a number.Įaster Saturday sees the annual Rivington Pike fell race. There is a way to calculate the 1/2 and 1/3 stop values however you can't do this in your head! ![]() Stops then 2 stops gives f8 (divide by 2) and 2 more gives f4 (again dividing by 2) ( or divide by 4 but half and half again might be easier for some) So for example if you are at an aperture value of f16 and want to open the aperture by 4 It's the same with the f1.4 two stops smaller is f2.8 (double the number), two stops smaller is So you can see how the sequence works.Įach step in the progression is 1 F stop, either bigger moving to the left or smaller moving to So begin with F1.0, two stops smaller is F2.0 (double the number), two more stops is F4 (double ![]() You only need to remember the F1.0 and F1.4 values. This gives a geometric scale of f1.0 f1.4 f2.0 f2.8 The F stops (full increment not 1/2 or 1/3 rd) are based upon a geometric incremented pattern based upon the powers of the square root of 2 If you are new to cameras (digital or film) and find the F stop notation difficult to understand, or remember, then this little explanation might help. ![]()
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