It does matter. Even Ansel Adams suggested a simple arithmetical progression in both the 1950 and 1968 editions of The Print. On page 63 of both editions, the test print example shows greater contrast between the 20 and 25 second exposure, and the 35 to 40 second exposure. A wider range of exposures would show even more contrast differences. Once a photographer feels at home with the progressive f/stop number series, it is almost as simple to use as a numerical progression.
Originally Posted by DannL.