The diminished scale contains a flat 3rd note (minor 3rd), a flat 5th note, and a double flat 7th note (compared to the major scale), so the step pattern is:
FINGERING FOR ROOT NOTE ON 5TH STRING:
This pattern can be used when the root note of the natural minor scale falls anywhere on the 5th string.
FINGERING FOR ROOT NOTE ON 6TH STRING:
This pattern can be used when the root note of the natural minor scale falls anywhere on the 6th string.
This is a useful scale to know when changing keys in lead work. The diminished scale has a unique property in that the root, b3rd, b5th and bb7th will share the same notes across the four keys that these notes contain, for example:
|Key of A||A||C||Eb||Gb|
|Key of C||C||Eb||Gb||A|
|Key of Eb||Eb||Gb||A||C|
|Key of Gb||Gb||A||C||Eb|
Therefore only 3 diminished scales are needed to cover all twelve keys.