The components of a telescope are essentially two convex lenses? Out of curiousity (boredom) I am trying to figure out if the addition of another lens could make the image non-magnified. For instance, what type of lens/other would you add in order to make the image look as if you were looking through a paper towel cardboard tube. In other words, what type of lens would cancel out the magnifying effect of a telescope if it were put in line with the other lenses? It's how my mind works....I can't help it!