• ADVICE FOR BEGINNERS: Try our Beginners Page !
• ADVICE ON FILTERS: A nice advice page is  called, " The use of filters". All types of filters: Moon, Nebular (LPR), and color filters are discussed.

My advice, for what is worth is: To get a Moon or neutral density filter and one Nebula filter.  My favorite nebula filter is the Lumicon UHC. This, IMHO, is the best all around performer in this category. It helps with many different types of objects. My experience is limited to scopes of 4" or more of aperture. If your scope is less then 4", I don't know how much benefit you'd get from a nebula filter. These filters will really darken the image.  My next favorite nebula filter is the Lumicon OIII filter. Great on the Veil nebula and many PN. Again, the smaller your scope is the more I'd favor the UHC over the OIII as it will dim the image less. I have seen little benefit from the DEEP SKY or LPR (light pollution reduction filter) in most situations. I have at times, from home, seen some benefit using a LPR with the 20" but not with the smaller scopes.

• Review of Nebula Filters This is a GREAT LINK , Ray Cash et al looked at many Nebula through a variety of nebula filters and rated each filter as to weather it improved the view or made it worse. A great Page!
• How to Find/View Planetary Nebula: There are two strategies: increase the power (magnification) or use a filter. Most PN will respond to either an OIII (the type of light that many PN emit) or a UHC filter. Sometimes "blinking" a filter between your eye and the eyepiece will help you find the PN as the stars will dim with the filter in place while most PN will not. Les Dalrymple in the December '02 Sky and Telescope advises 8x-25x of power per inch of aperture or "moderate to high" power.
• TELESCOPE REVIEWS: Are on Our Beginners Page.
• How do I choose a nice set of EYEPIECES for my 'scope? Al Nagler's advice.
• What Televue REFRACTOR is right for you? Uncle Al speaks.
• Newtonian Collimation
• Don's Messier Marathon Advice: Don's Messier Marathon Advice