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Can M42 mount lenses be used well with Nikon F mount crop cameras? I know some adapters have no correction lens while others do have correction lens yet both are for Nikon F mount. I take it that means there are some M42 mount lenses that don't need a correction lens because they come from a different type of camera than the ones that need the correction lens? I've done some googling on it, but evidently my search terms are not quite right, to get better info on this.
