Multicoating
Modern lenses are made up of many individual glass elements, these elements improve the overall image quality compared with a simple 'single' or 'double' element lens, however, ...
Multicoating refers to the application of more than one layer of coating on a lens.
Multicoating's real contribution was to allow the 12 to 15 group zoom lenses possible. Without multicoating, these lenses would be unusably low contrast.
What is the significance of elements and groups?
Not very much just from the numbers.
Multicoating; much darker reflections of many colors, especially green or dark red. Hint: Multicoated Schneider lenses are usually marked "MC"
This photo shows the three types of coatings. Note the reflections in each filter.
The fungi get into your lenses by minute air borne spores and they grow on the inside lens surfaces by eating the special multicoatings that are put on to control light reflections! ...
The thing I look for in a ‘skylight' or UV filter is multicoating. I use HOYA multicoated filters on all but my most wide-angle lenses (where they can cause vignetting).
The other filters they manufacture - with HMC and SMC multicoatings - use clear optical glass.
THe site is in polish but thepictures anid graphs speak for themselves, and you can really see the effect of lack of multicoating on the amount of flare in an image. THe tiffen filter came out TERRIBLY in these tests.
If you're one of those photographers, you should use a multicoated UV filter, which helps curb any additional image degradation, or flare, that you might otherwise get from the sun or reflective light sources. Multicoating can ensure that 99.
 See also: Shutter, Light, Lens, Focus, Photography
  
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