【Overview】 This is a self-made rear soft filter for astrophotography (see photo 1). By attaching it to the rear of a wide-angle lens, it suppresses the streaking of stars in the four corners of the screen and has the effect of making bright stars appear larger. Thanks to your support, it has been used by over 170 customers since its release. The "defective" product has some coating unevenness that appeared during production. Since it doesn't significantly affect the filter's performance, it is being sold at a discounted price. 【Size and Material】 Size: 105mm x 100mm Thickness: 125μm (0.125mm) Material: PET (more rigid than polyester and less prone to scratches) 【Example Photos】 Photo 2 was taken of the night sky without a filter, photo 3 was taken with a LEE No. 3 filter, and photo 4 was taken with the self-made "Medium" filter. Comparing photos 3 and 4, you can see that the effect is almost the same as the genuine product. 【How to Use】 This filter is used by attaching it to the rear of the lens. Cut it with scissors and secure the sides with double-sided tape or similar. It can be used in either direction, regardless of front or back. Refer to photo 5 for how to attach it to the lens. (If there is a mount on the rear of the lens, insert it into the mount.) 【Compatibility】 You can refer to the table in photo 6 for compatibility with filters sold by various manufacturers. 【Shooting Equipment】 Camera: Canon EOS 6D Mark II Lens: Canon EF 16-35mm f/2.8L II Single shot Development software: Lightroom Classic 【Other】 We manufacture with the utmost care, but please refrain from purchasing if you are looking for a perfect product. Shipping will be via regular mail, so please allow approximately 5 days if it includes weekends or holidays.