I have noticed that there is a small black spot (maybe dust or something) when I look through my eyepiece. I have cleaned my eyepiece, it is not on the lense either, so I took the lense off and had a look through the eyepiece, it is still there! So I am guessing it is internal. How do I fix this? I know from reading other forums that you shouldn't mess with the inside but this is annoying me. It doesn't affect the photos! Can anyone tell me where this spot is likely to be and how do I clean it.