In article <852601387.21420@dejanews.com>, mmathu@hntb.com says...

>Knowing the "half stop" designations is useful if you are recording
>your exposure settings in a notebook (or something similar) for future
>reference. It's easier to note the aperature used as "f/6.7" instead of
>"halfway between f/8 and f/5.6".

How about using something like, "f5.6 1/2"? ;-)
Hope This Helps