Olympus also made a 250 film-back for their OM system. Not sure that it kept its compact 'ethos' with both the 250 back and the motordrive with the 18 volt battery grip (12 x AAs), though the 15 volt NiCad version was about the same size as the power-winder.
My old 1973 OM system lens catalogue is looking a bit tatty now, but it shows the range that Olympus said would all be available at the time of the OM1 launch. In fact, they couldn't live up to the hype and some lenses didn't appear for a year or two and some never made it at all! At least two in this picture never materialised - the 400mm F4.5 and the dinky little 300mm F6.3
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