Originally Posted by
Gene McCluney
You are incorrect, camera lenses of this period also have just one focusing knob. But..camera lenses have provision for waterhouse stops, and your lens does not, which is a sure giveaway for it being a Magic Lantern lens. Now magic lantern lenses and camera lenses are the same in optical construction if a Petsval design, except for the slot for waterhouse stops.
a 12" lens is about right for a focal length for a magic lantern, as the magic lantern slides which are approx. 3x4" would just use the central "sharp" area of a 12" Petsval.
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