This camera-specific bayonet adapter is designed for Nikon DSLRs and features a large M48x0.75 mm female thread. Its generous inner diameter of 41.2 mm effectively prevents vignetting on full-frame sensors, ensuring your astrophotography images stay clear and edge-to-edge bright. Made from matte black anodized aluminum, the adapter is both lightweight and durable, weighing only 30 grams. With an overall light path length of 8.0 mm, it offers precise compatibility and optimal performance for your astrophotography setup.