Banjo F♯m chord (Double C)F♯ minor on the 5-string banjo: 1 2 1 4, and 2 more shapes

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

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

Sounds: C♯ A C♯ F♯  ·  F♯m is F♯, A, C♯ (1 · ♭3 · 5)

Found in: A major (vi), D major (iii), A mixolydian (vi), B mixolydian (v), B dorian (v), B minor (v)

The 5th string: the short g rubs against the F♯ in this shape, a semitone away: some players let it ring, some skip it.

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