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I checked in to Skyglow broadband and you have the option of purchasing one that either threads into the eyepiece or into the rear cell of an SCT. I'm buying a Nexstar 8SE. I presume this would work with the Nexstar and that by purchasing this type of mount I wouldn't have to swap out the filter every time I swapped out an eyepiece? Any other advantages/disadvantages? Link is: http://www.telescope.com/control/product/~category_id=accessory_sale/~product_id=05658

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I would not recommend the rear-cell filter route. You will eventually want to use your filter in some other optical setup like another scope or in someone's eyepiece, in which case, you are kind of out of luck. Also, you will not want to just keep the filter in the scope at all times, as there are a number of instances where the view will be better without the filter. Changing out a filter from a rear-cell is a bit more involved when you want to do something different than it is when just changing the filter on the front of an eyepiece. I recommend getting a filter which screws onto the eyepiece. It may be a pain at times, but in the long run, it is probably the better way to go. Clear skies to you.

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David W. Knisely
Hyde Memorial Observatory
http://www.hydeobservatory.info

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