Sans Mirror  

We have quite a few "lens mounts" in the mirrorless arena (some now deceased, as noted):

• Canon
  • EOS M mount (APS-C sensor)
  • EOS RF mount (RF is full frame, RF-S is APS-C frame)
• Fujifilm
  •  X mount (also called XF) (APS-C sensor)
  • GF mount (also called GFX) (medium format sensor)
• Hasselblad 
  • XCD mount (medium format sensor)
• Leica
  • M-mount (not covered on this site)
  • L-mount (TL is APS-C and SL is full frame)
• Nikon
  • CX Mount (also called 1-Nikkor, or Nikon 1) (1" sensor) deceased
  • Z mount (DX is APS-C, FX is full frame)
• Olympus
  • m4/3 (micro 4/3)
• Panasonic
  • m4/3 (micro 4/3)
  • L-mount (full frame)
• Pentax 
  • Q Mount (1/2.7" sensor) deceased (except in Japan)
  • K Mount (APS-C sensor) deceased (as a mirrorless mount)
• Ricoh
  • GXR lens/sensor modules (S and P are small sensor, A is APS sensor) deceased
• Samsung
  • NX Mount deceased
• Sony
  • E-mount (APS sensors) (same physically as FE, but lenses with smaller image circle)
  • FE-mount (full frame sensors) 

If you're interested in my recommended m4/3 lens list, you can find it as a B&H wish list of m4/3 lenses here.

Sub-sections in the Lens section: