Why images are smudgy when I use Barlow with camera? I am beginner and just got Nexstar 8se. I am using a canon 650D(aka Rebel T4i) with a T-ring for imaging. Just as the title, the images I get when using 2x Barlow, are smudgy. Moon looks crisp and fine when I use eyepiece to observe with same Barlow. How can I fix this?