* Astronomy

Filter tips for observing Saturn:

A #82A Light Blue filter is a popular filter to highlight low contrast features on the planet.

A #11 Yellow-Green filter (78% transmission) is also a nice general filter to observe Saturn. The filter will increase the contrast of any dark surface detail on the planet or rings.
The high light transmission the filter makes it suitable for even small scopes.

With larger telescopes (100mm plus) a #56 Light Green (53% transmission) can be used. The rings of Saturn are also best highlighted using a #56 Light Green filter, or a #30 magenta filter (Large scopes a #47 violet filter).
With very large scopes (200mm plus) a #58 Green (24% transmission) filter, or #80A filter, will help bring out detail in the polar regions of the planet.

Tip: The photographic pale magenta coloured FLD filters that are designed to remove the yellow-green resulting from fluorescent bulbs are excellent for use on the planet. 

So choosing a correct filter is a fine balance between seeing conditions, the telescope aperture size, magnification, and the feature you want to highlight. Obviously, darker filters (with less visible light transmission) are best suited to telescopes with larger apertures. A higher magnification will also generally darken the image, and may obscure finer details.