STC, a Taiwan-based company, has developed and produced a new niche filter for astrophotographers that clips on directly over your Canon or Nikon camera's full-frame sensor. The filter will supposedly reduce the effects of artificial light in your astro images by blocking certain light wavelengths related to city lights, such as mercury and sodium. While it will simultaneously intensifying light spectrums that are naturally present in the night sky.
STC constructed this filter along with Dr. Wei-Hao Wang, a professional astronomer and astrophotographer. The frame of the filter is built out of A2 stainless steel which is essentially non-magnetic, as to not interfere with any of the internal camera components. The filter itself is made of Schott optical glass, the same glass you will find in the famous Carl Zeiss lenses.
They do admit you can achieve similar results with conventional front lens element filters and post processing, but having the filter actually based closer to the sensor does reduce the color shift better in the corners and edges of the images, which is much better suited for wind angle lenses. As well for professional astrophotographers, it allows you to switch between various lenses with more ease, by obviously not having to swap filters with each lens change.
As you can see in the brief YouTube video, it also seems to be installed and removed from the camera quite easily. I love to shoot Astrophotography, it is one of my favorite things to photograph, but I do not do it often enough to warrant buying one of these. But if I was able to shoot stars as much as I wished, even just once a month, I would 100% order one and try it out. The sample images in the links above were very convincing.
While being manufactured by STC in Taiwan, the filter is being distributed by Hong Kong based company Cyclops Optics, and is available right now for Canon and Nikon full-frame cameras for roughly $208 (HK$1,620.00) which includes free international shipping. It also comes with an 18 month warranty on the glass, and a lifetime warranty on the filters frame.
If any readers out there have used this before, or plan on trying one out, I would love to see your results when you have them.