Banjo F♯ chord (Double C)F♯ major on the 5-string banjo: 1 3 1 4, and 2 more shapes

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

1. String 4 (C): 1st fret, index finger (barre), C♯
2. String 3 (G): 3rd fret, ring 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♯ is F♯, A♯, C♯ (1 · 3 · 5)

Found in: B major (V), F♯ major (I), D♭ major (IV), F♯ mixolydian (I), D♭ mixolydian (IV), A♭ mixolydian (♭VII)

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.