Pentax SMC -FA manual Stops or F-NUMBERS and Click Stops

F-STOPS OR F-NUMBERS AND CLICK STOPS

There is a white dot next to the maximum f- number engraved on the lens's aperture ring on many Pentax lenses. This white dot indi- cates an aperture which is darker by one stop (larger number). The illustration below shows the white dot next to f/4.5 is f/5.6.

The click stops between two engraved f/stops are equivalent to intermediate f-stops. Some lenses do not have an intermediate click f- stop on the aperture ring due to limited space between the f-numbers engraved on the aperture ring.

1.4		2	2.8	4	5.6	8		11	16	22	32	45
1.2	1.7	2.4		3.4	4.8	6.7	9.5	13.5		19	26	38

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