You can see that there is a wide range of sizes, and it is in general the smaller satellites that are difficult to see in normal observing conditions. Thirteen of Saturn's 18 known satellites were first detected at or near ring-plane crossings. Thus, though the rings appeared slightly open from the Earth, the Earth and the Sun were on opposite sides of the ring plane, giving us this rare view of the Saturnian ring system, obtained with the Hubble Space Telescope. For a larger image, see NASA's Planetary Photojournal 's image and official caption. This is a close-up time sequence of the eastern half of Saturn's rings during the November crossing of the Sun through Saturn's ring plane.
Time increases left to right and top to bottom.
A larger version can be seen here. Click here for their home page.