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Hi Guys I've read about a special Hoya filter, intended to be used for portrait or general landscape (especially in fall) photography: The "Hoya RA54 Red Enhancer (Intensifier)" he original article that gave me that idea can be found here: http://www.lonelyspeck.com/hoya-intensifier-review-an-affordable-light-pollution-filter-for-astrophotography/ Now, I did some own comparison, to get an idea how well it works. First I compared the filter's properties with the emission line of a sodium light source; these nasty orange light you will anywhere in cities. Usually you can be miles away and still have a significant amount of orange glow in your picture. The transmission properties of that particular filter seems promising. At 590nm wavelength (the emission maximum of a sodium lo pressure light source), we only have roughly 40% transmission while other wavelengths are only slightly affected. But what does it mean...? Well, that enables you to selectively cancel out a certain colour, in that case the annoying light of that sodium light source. Since it still has 40% transmission, you will not remove all of it, but for 30-60 € (depending of the diameter you need) it improves you pictures quite a lot. Take a look at these pictures, showing a 250000-people city in central Europe (a heavy example of light pollution indeed): All pictures were taken with a RX10, white balance set to cloudy (just to avoid the camera having any influence to the result), 8 seconds/ f2.8 I know, these are quite challenging conditions, with the city directly in front of you. If you use it in more typical scenarios, that filter should really do a good job removing the vast majority of orange-ish light form your night shoot.