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I have absolutely no idea why you would think that an f3.5 lens means it would be a "crude triplet".
Indeed. Were the lenses for the Bronica RF645 - none of which were faster than f/4 - "crude triplets"?
When roll film folding cameras were fashionable (say 50 years ago) even the fastest films were about the same speed as the slowest available today. So we don't need lenses to be as fast as we once did. Neither is a particularly fast lens needed to get a strong selective focus effect on a medium format camera.
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