Common

• 123mm: Focal length
• F/1.2: Maximum aperture (or F/1.2-3.4 for variable aperture zooms)
• AF: Auto-Focus

Compatible Body Brands

• Nikon
  FX: For ull frame and APS-C sensor cameras. Lenses not marked DX or FX is FX.
  DX: For APS-C sensor cameras
• Canon
  FX: = Canon EF marking. For Full frame and APS-C sensor cameras. Lenses not marked DX or FX is FX.
  DX: =Canon EF-S marking. For APS-C sensor cameras
• Sony/Minolta (A-mount / Alpha)
  FX: For Full frame and APS-C sensor cameras. Lenses not marked DX or FX is FX.
  DX: = Sony DT marking. For APS-C sensor cameras
• Pentax

In theory you can use Tokina DX on full frame cameras. However as the DX lenses pass in a smaller image, on the bigger sensor it will show a black halo (vignetting) (images courtesy of photographylife.com)


Unlike Canon EF-S series having a phyiscally longer bayonet connector to the camera body, Tokina DX uses the same short connector as Canon EF lenses, so physically it can fit, however you will still get the vignetting issue.

Functional Features

• DX: Only compatible with a cropped sensor (APS-C)
• FX: Full frame. (Most full frame Tokina lenses titles do not carry FX, so the convention would be if no DX in the name then the lens should be Full Frame)
• AT-X Pro: Advanced Technology – Extra Professional (zoom with constant aperture).
• AT-X : Advanced Technology – Extra, consumer line (no constant aperture on zoom).
• FC: Focus Clutch - One-touch focus clutch allows the focus to be moved quickly from the AF position back into the MF position
• One Touch FC: One-Touch Focus Clutch mechanism.
• AF: Auto-Focus.
• IF: Internal Focus system.
• IRF: Internal Rear Focus system.
• 1:1 Macro: 1:1 Magnification

Lens Elements

• XR: Extra Refractive Index Glass (lighter, smaller lenses)
• AS: ASpherical Optics.
• F&R: Advanced Aspherical molded glass element in the front and in the rear
• SD: Super low Dispersion.
• HLD: High-refraction, Low Dispersion.
• MC: Multi-Coating.
• FE: Floating Element system.