Banjo E7 chord (Open D)E seventh on the 5-string banjo: 2 2 2 0, and 6 more shapes

Frets, string 4 to string 1: 2 2 2 0 (open position)

1. String 4 (D): 2nd fret, index finger (barre), E
2. String 3 (F♯): 2nd fret, index finger (barre), G♯
3. String 2 (A): 2nd fret, index finger (barre), B
4. String 1 (D): open, D
5. String 5, the short f♯: open, F♯, not in the chord

Sounds: E G♯ B D  ·  E7 is E, G♯, B, D (1 · 3 · 5 · ♭7)

The 5th string: the short f♯ adds the 9th over E7, a colour rather than a clash.

Open D tuning: f♯DF♯AD, the short 5th string first, then strings 4 to 1.