I live in the middle of a largish town of 70,000 so light pollution from street lighting and other sources is a problem for anyone interested in astronomy. Poor seeing increases the impact of light pollution and in England the seeing is rarely very good. I've been looking at LP filters for a while now and was never sure if they would do anything worthwhile or of they are in fact snake oil. After reading a few reviews I went for the middle range 2" Orion SkyGlow Filter which I got for £75. The filter is designed specifically for 2" screw attachment to astronomic eyepieces and the like, although I'm sure that it could be adapted to go on the front of a camera lens. The Orion SkyGlow is classed as a broad-band Light-pollution Reduction (LPR) filter; designed to help improve the visibility of a variety of deep-sky objects by blocking out the common Mercury vapor, Sodium, and some other emission lines from man-made and natural (airglow) sources. To test the filter, I took a single 60 second exposure @ISO800 first without and then with the filter. These images were taken with my William Optics ZS71 and Skywatcher Field Flattener. Without LPR filter: With LPR filter: Straight away I was amazed at the difference, it completely exceeded my expectations. There is a definite green colour cast to the filter and you are losing maybe a third of a stop of light. The important win is the improved signal to rubbish ratio, there is more good light in comparison to the bad light. To do a further comparison, I made an adjustment in Photoshop to set the grey levels. This is good general fix to eliminate colour cast from light pollution. Without LPR filter With LPR filter Living in an area with light pollution like I do, this is completely worth the money. It opens the door to longer exposures and possibly lower ISO, with the benefits that brings.