I switced from Olympus to Nikon in the mid 1990s, primarily due to the fact that my early version OM-4 needed a new battery everydamn time I wanted to use it. Other reasons were that the OM bodies got lost in my large-economy-size hands; the early 50/1.4 lens which came with an OM-2 ca. 1978 wasn't very good at f1.4. The OM bodies are nowhere near as rugged and well made as a Nikon F or F2. The OM-2 and OM-4 are useless without the battery. The Oly lenses are excellent, by and large, but the Nikkors are if anything a bit better, sometimes a lot better.