for Nikon AI: This adapter is designed for Nikon AI/NI SLR camera, allowing M48*0.75mm lenses to be mounted onto camera bodies for Nikon. M48mmx0.75 adapter for Nikon AI/NI SLR camera to telescope eyepiece photography. With this adapter, you can adapt your M48 mount lens for Nikon AI mount DSLR. The adapter has no electrical connection and diaphragm & focusing are required to be set by manual. Compatible for Nikon D40 D3000 D3100 D5000 D5100 D80 D90 D200 D300 D300S D7000 D3000 D60 etc. for Canon for EOS: This adapter is designed for Canon film or digital SLR & DSLR cameras, allowing M48 lenses to be mounted onto camera bodies for Canon. Suitable for Canon 1D(all), 5D(all), 6D, 7D, 10D, 20D, 20Da, 30D, 40D, 50D, 60D, 60Da, 70D, 100D, 300D, 350D, 400D, 450D, 500D, 550D, 600D, 650D, 700D, 1000D, 1100D, D30, D50, D60, Rebel, Rebel XT, Rebel XTi, Rebel XS, Rebel XSi, Rebel T1, Rebel T1i, Rebel T2, Rebel T3i, Rebel T3i, Rebel T4, Rebel T4i, Rebel T5, Rebel T5i, X6i, SL1. Automatic diaphragm and auto-focusing will not work, only manual model will be available. Specification: Material: Aluminium Color: Shown As Pictures Lens Screw Mount: T M48*0.75mm Optional M48*0.75 Adapter: for Nikon AI, for Canon for EOS Diameter: Approx. 60mm / 2.36inch Weight: 33 - 45g Package List: 1 * M48 Adapter .