The Nikon Bellows III is a compact bellows for Nikon F mount cameras and lenses. This isn't a big PB-series bellows: it's tiny, with round bellows and a 14cm rail. If you have a newer camera with a large handgrip, you may have difficulty mounting it to this bellows: the rear mount doesn't swivel and the rear standard support may get in the way. One of the rail distance scales has been replaced with a (very well made) handwritten scale; otherwise, this bellows is in great shape.