C1: for all cameras that have a 2.5mm phono port. Fits most three digit Canon DSLR's (i.e. 350D), R6/7, RP, 60/70/80/90D, 1000D, G series. Pentax K series, *istD series, GH series, MZ-6, ZX-L, MZ-L. Contax N. Samsung GX. Fuji X, Olympus EM-1 MkII, and many others.

 
Canon C3: fits Canon EOS single digit series cameras (1D, 5D, 6D, 7D, etc), R5, 1V, 30/40/50D, D2000, EOS3

Nikon N1:  fits Nikon Z8/9, D5/6, D4 series, D500, D8xx, D700, D3 series, D300 series, D200, D1 series, D2 series, N90, Nikon F

Nikon N2: fits Nikon D80, D70s, D70 w/ battery grip

Nikon N3: fits Nikon Z5/6/7, D5xxx, D3xxx, D7xxx, D750, D6xx, D90, Z series (except 8/9), P series

Olympus L3: fits Olympus E600, EP1/2, E30, E620, E450, E520, E420, E510, E410, EP series

Sony S1: fits Sony A series (*not for cameras using the Multi-Port))

Sony S2: fits Sony A1/A9/A7 series, and others with the Multi-Port

USB-C: fits Sony A7V/A7C/A6700 and others that have a USB-C port.