Tokina EL lenses

While looking for a particular Tokina lens today, I ran across a new Tokina lens designation. At least to me it's new -- Tokina EL.

Wiki lists Tokina lens designations (below) but no EL. At first I thought Enlarging Lens -- commonly used by other lens makers, but all I can find are a 28mm EL and a 2X converter EL. Anyone know anything about the Tokina EL lens(es). "They" appear to be fixed mount.

• FX - Full frame
• DX - cropped digital
• AF - Auto-Focus
• AT-X Pro - professional line (constant aperture zooms or primes)
• AT-X - consumer line
• IF - Internal Focus System
• FE - Floating Element System
• NH - No Hood (10-17mm fisheye without built-in hood)

I have a EL 2.8 / 28mm lens in M42 mount. I don't use it often but it does the job, no complaint. I guess it is not that different from the other third party 28mm lenses from the '80/90.