Canon’s Super Spectra Coating is its name for a multi-layer anti-reflective coating applied to lens elements. Its main purpose is to reduce reflections inside the lens, which helps lower flare and ghosting and can improve contrast.

The key thing to know is that lens coatings are common across manufacturers, but each brand often uses its own marketing name. So Super Spectra is Canon’s branded coating technology rather than a completely unique category of coating.

Compared with newer coatings, Super Spectra is considered an older or more conventional multilayer coating. Canon has also used newer technologies such as SWC (SubWavelength Coating), which is designed to control reflections even more effectively. Other brands have similar premium coatings under different names, such as Nikon’s Nano Crystal Coat.

In short: Super Spectra = Canon’s standard multilayer anti-reflection coating; newer coatings like SWC are more advanced versions aimed at even better flare resistance.