F#dim is a diminished, spelled F#, A and C. In Drop D tuning (D2 A2 D3 G3 B3 E4) the easiest shape is 4342xx, which sits at fret 2, spans 2 frets and mutes 2 strings. 12 positions for it are shown below, from the nut up to fret 13.
Notes and intervals
Note
F#
A
C
Interval
1P
3m
5d
12 ways to play it
Ordered by how hard they are to fret, easiest first, one per position on the neck. Fret numbers are relative to the position marked beside each grid.
4342xxsits at fret 2, spans 2 frets and mutes 2 strings4045xxsits at fret 4, spans 1 fret, lets 1 string ring open and mutes 2 strings40421xsits at fret 1, spans 3 frets, lets 1 string ring open and mutes 1 string707575sits at fret 5, needs a barre across 3 strings at fret 5 and lets 1 string ring openx9101110xsits at fret 9, spans 2 frets and mutes 2 strings100101110xsits at fret 10, spans 1 fret, lets 1 string ring open and mutes 1 string4375xxsits at fret 3, spans 4 frets and mutes 2 stringsxxx11108sits at fret 8, spans 3 frets and mutes 3 stringsxxx141314sits at fret 13, spans 1 fret and mutes 3 stringsx971178sits at fret 7, needs a barre across 3 strings at fret 7 and mutes 1 string4042xxsits at fret 2, spans 2 frets, lets 1 string ring open and mutes 2 stringsxxx212sits at fret 1, spans 1 fret and mutes 3 strings
Keys F#dim belongs to
F#dim is diatonic to 8 of the 96 keys this app knows, playing a different role in each.