SUPER COMPACT Makinon 300mm F5.6 MIRROR LENS , made in Japan , mid 1980s. Olympus OM manual focus film SLR mount . Manual focus. Caps inc . Uses 67mm filters ( not inc ) In full working order, butter smooth focus. Normal small signs of use to the external barrel. The optics are totally free from scratches and fungus but the rear mirror does have some haze / deterioration on it hence the low price. 6.5cm long mounted on a camera . Free UK P&P.