The Canon 20mm f/3.5 Macrophoto is a specialty high-magnification macro lens designed for close-up and photomacrographic work rather than general photography. It is a short-focal-length optic intended for use on bellows or extension systems, producing magnifications well beyond life-size.

At UK auction, hammer prices for this lens have been modest, with the limited sales history showing results of £80 and £110 — so today a typical example is worth roughly £80–£110 at saleroom level, excluding commission. With only a handful of recorded sales, the market is thin and a single well-presented example can sell for more or less than this band depending on condition and accessories.