Banjo Bdim chord (C Tuning)B diminished on the 5-string banjo: 2 4 3 3, and 4 more shapes

Frets, string 4 to string 1: 2 4 3 3 (first position)

1. String 4 (C): 2nd fret, index finger, D
2. String 3 (G): 4th fret, little finger, B
3. String 2 (B): 3rd fret, middle finger, D
4. String 1 (D): 3rd fret, ring finger, F
5. String 5, the short g: open, G, not in the chord

Sounds: D B D F  ·  Bdim is B, D, F (1 · ♭3 · ♭5)

Found in: C major (vii°), G mixolydian (iii°), D dorian (vi°), A minor (ii°)

The 5th string: the short g adds the ♭6 over Bdim, a colour rather than a clash.

C Tuning tuning: gCGBD, the short 5th string first, then strings 4 to 1.