Solar viewing thingy.

Yesterday I built a pinhole projector. I used a six foot long cardboard tube that I got several years ago when I worked in a textile warehouse. The projector worked just fine (although the solar image was nothing spectacular), but it's very awkward to hold. Naturally, after messing around with it for a few minutes I started thinking ways to attach a camera to it. Maybe I can attach an SLR directly to the tube.