I have a mint Orion SkyGlow SCT filter which has only been out of the case three times. I goofed when I ordered it - I really should have ordered the Ultrablock instead. This is an LPR filter, and thankfully there is not too much light pollution where I live. Orion states that it should be used in areas of moderate light pollution, or for astrophotography with SCTs. I have kept it for about a year just in case I was observing somewhere where it would come in handy, and the lack of use tells me its time for it to go. I would like to trade for UO Orthos between 7-12mm or any FL 2" UO Konig (again I pay difference where there is one). The filter is currently about $80 from Orion if purchased new.