Attaching the camera

So after my last attempt of holding the camera to the eye piece provided somewhat shaky results. So I decided to get a t-mount, which is just a piece of metal that allows me to attach the screw thread of my camera directly to the telescope. I attempted a shot in the daytime to try and calibrate everything correctly before I begin. As you can see the results are somewhat odd. Everything looked OK until I pressed the shutter on the camera, and then this happened. I think what is happening is that there is more light coming from the edges of the image and not enough from the center. I guess this shows how an image will be distorted on the edges of the telescope. I guess that this can not be avoided, and what I have actually done is taken a picture of the shape of the mirror in my telescope. At first, this black blob looked like a shade on one side of the image, but careful collomating placed it bang slap in the middle. The reason that this blob isn't right in the middle is because of the weight of the camera. Remember as of yet I have the camera attached directly to the eye piece, and there is no structure to support the weight, as of yet. I believe that when I take a picture at night, this effect will not be so pronounced (enough that it will not be noticed)