I have built a DIY clip-in filter holder for use with my DSLR. I used a spare T2 to 1.25 inch adapter supplied with my astronomy camera. I noticed that my Canon 50D has space to accommodate this adapter. I then drilled a small hole in the camera and used a small screw to fasten the DIY clip-in filter in place.
DIY clip-in filter for DSLR
The clip-in filter works best with modified DSLR cameras with the stock filter removed. It can be used to mount 1.25 inch filters such as a dual band filter and a UV-IR filter. I have also made a clip-in stock filter so I could still use the modified DSLR for daytime photography.
Night Sky in Focus © Anthony Urbano | Bacoor, Philippines
Night Sky in Focus 