Lens Coatings
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Lens Coatings
One last thing to think about. Older lenses can be uncoated or single coated. Most (but not all) modern lenses are multicoated. You might want to consider the lens coating (or lack of it) when buying a used lens.
Lens coatings have two drawbacks. First, they must be kept scrupulously clean at all times, as oils and dirt interfere with the way they work. Fingerprints are extremely obvious on coated glass.
Eroded lens coatings; while slight erosion won't impact the quality of the picture, severe erosion will impact the pictures and make them appear "blotchy".[3] ...
Ethanol and cotton flannel are recommended by Nikon, so I doubt that they would harm lens coatings if used in moderation.
Among the methods used were soft focus, special filters and lens coatings, heavy manipulation in the darkroom, and exotic printing processes.
Since lens coatings are relatively fragile, one should always be careful when cleaning coated lens surfaces (like the front of the lens), so as not to scratch or smudge them.
If you use these stepping rings you probably won't be able to use a standard hood. I never use hoods so I don't worry. Lens coatings have made hoods obsolete for decades, except as prophylaxis (protection).
means they have a wider aperture, making them better for low-light situations. Pro zoom lenses will also retain this aperture throughout the zoom range. Pro lenses are also more likely to be be built better - more rugged, with better lens coatings ...
 See also: Lens coating, Coating, Lens, Photograph, Lenses
  
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