"Leica" or "Zeiss" pronounced correctly will not arouse funny looks amongst English-speaking birders, but "nee-kon" might, notwithstanding that it is in fact correct. I've never quite understood why the Japanese adopted the romanized spelling "Minolta," since they have no actual "L" sound in their language, although their pronunciation of the syllables "ra," "ri," "ru," "re" and "ro" hint at an "L"-like sound. I always thought the pronunciation of "Swarovski" was fairly obvious, but, like others here, I've heard all kinds of mispronunciations. This is interesting, since the Swarovski name has fame beyond birding optics, but maybe those who covet crystal also mispronounce it.