The small dotted line is approximately the path of the light pollution in my photos. Image 7 shows my shooting location for these images. At night the front of the cabin can be lit by cars coming down the road to one of the campgrounds. On that side of the island, there are about 3 miles of open water to the mainland. The second reason I chose the backside of the island is that it would block a lot of the “local” light pollution from Yarmouth and Falmouth Maine. The rocks and seaweed don’t leave a place to set up the camera. The front side of the island has no beaches, and even in daylight, it is hard to walk the seaweed-covered rocks. I choose this side of the island for two reasons.įirst was that this location has beaches allowing me to walk there when the tide is low to a little over half tide. Overall, the IRIX Edge filter does block a small amount of light based on the histograms above. The image with the light pollution filter has darker red and greens. Without the filter, the red and green channels are brighter with more data to the right, and the peak is further right. There is more of a difference between the red and green channels between the two than there was for the top half of the image. The blue channels again are almost identical, with the histogram for the image without the filter being just slightly brighter. The histograms for the bottom half of the image, with the city lights, light pollution, and moon glow, are noticeably different. Histogram of bottom half with IRIX Light Pollution filter I chose these so the brightness of the moon glow could be as close as possible. The two images below are the last without the IRIX filter, taken at 11:11:43 pm, and the first with it, at 11:16:17 pm. All of this is to explain the bright moonglow low on the right side of the photos. Plus, I had one more location I wanted to photograph after these test images. I would have to try and find my way through briers in the dark. If I didn’t, I wouldn’t be able to walk back along the beach. High tide was at 3:57 am, so I needed to finish taking all pictures by 12:30 am. The moonset was at 10:58 pm, but the humidity was 92% that night, so the moonlight stayed visible for awhile. On the night of August 5th, 2019, while in Maine, I made a side-by-side comparison of the Milky Way without and then without the IRIX filter. A small, all-night convenience store 500 yards away could cause more problems for your image than a small town 10 miles away. Not all light pollution sources are large cities. Light pollution works the same way as your camera’s flash the brightness is a function of distance squared. In the article, “ Light Pollution Filter Mega-Comparison by B&H Photo Video,” Kirk Keyes discusses the light emitted by the most popular exterior lighting types and briefly discusses types of filters. We all know large cities will create a large glow on the horizon of your image. Light pollution is any light that is produced by humans in the night time environment. It is worth noting that many lighting types now being used by municipalities donʼt have the same colors as Sodium lights, and a filter like this would not be useful for them. This type of artificial lighting creates a yellow haze in night images. Most filters that are described as light pollution filters, the Irix filters included, remove the wavelength of 589 nm, that of Sodium Vapor lights used for street lights. (It’s also available in 67mm, 72mm, 77mm, and 82mm diameters.) While no filter can remove all light pollution, I wanted to see if this light pollution filter could help with my Milky Way photography. Will's Notebooks (daily digital doodles):The IRIX 95mm Edge Light Pollution Filter costs about USD 179.00, which is a lot of money for a specific purpose filter. PM Mirror (songs and vids to analyze yourself to): In this one I talk about getting screwed while buying a truck, body odor, run the jewels, and routine creativity. Prolly the best colorcast I've put down in a while and it's special to me because i did it on the tail end of a full day of manual labor with achey kidneys.
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