The Alpa 9d Half-Frame is a 35mm single-lens reflex camera produced by Pignons of Ballaigues, Switzerland, configured to expose half-frame (18×24mm) images on standard 35mm film. It belongs to the late Alpa reflex lineage and was a low-volume, high-cost specialist tool aimed at professional and scientific users when new.

Auction data for this variant is extremely thin: a single UK hammer result of £4,000 from March 2014 is the only datapoint available, so any sense of what the camera is worth today rests on that one sale. At saleroom level the half-frame configuration is a rarity premium over standard Alpa 9d bodies, and in 2026 collectors should expect strong condition-sensitivity and wide bid spreads when an example sells for anything at all.