There are more 'Sidi Bou Said' photos in my gallery. This is digital, not a slide. At first you look at images from this lens and think the colour is off, but that may be just because you know it is single-coated. Now I am not so sure that there is much of a colour distortion. Certainly makes nice B/W photos, though.
coatings work by canceling certain wavelengths in the light reflections from the glass surfaces. Multi coatings cancel a fairly broad spread of wavelengths, so both reflect less than single coatings, and have less color cast than single coatings.
Since a single coating can only cancel one wavelength entirely, there is a complementary colour shift, though very slight, in the transmitted light. The image is also a bit lower in contrast, since the coating isn't as efficient, which some people prefer for b/w photos.
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