EDIT: As an example, you could view your lens as having settings for the following f-stops: ... 8 9.5 11...

Your meter then has increments of ... 8 9 10 11...

If your meter then reads f9 or f10, just use f9.5 on your camera (until you get a bit more experienced and confident to play around with the exposure according to the conditions)[/QUOTE]

The above is the correct and perfect advice. Just to add one thing, unless you're shooting color positive transparency film, it is not usually necessary to concern your self with 1/3 stops, and this is just IMHO, but even half stops don't typically make much of a difference with negative films, espesially if one has taken the time to do threshold exposure tests as suggested in most zone system manuals. Most important are good metering techniques. Enjoy that camera and lens. They can really deliver superb results.