The Danubia Photo Adapter 1" fits into a telescope with a 1 inch eyepiece, so a camera can be attached directly to the telescope for astro photography. Requires T2 Mount for Digital SLR attachment, (not supplied). An ideal way for mounting a digital SLR camera to the eyepiece of the telescope, just fix the T2 mount to the eyepiece & then insert into the aperture where the eyepiece normally sits & off you go.