【Overview】 This is a self-made rear soft filter for astrophotography. (Photo 1) It is made by evenly spraying a transparent resin onto a PET sheet. Since its release, it has been used by over 160 customers. 【Size and Material】 Size: 105mm x 100mm Thickness: 125μm (0.125mm) Material: PET (more rigid than polyester and less prone to scratches) 【Actual Shooting Examples】 Photo 2 was taken of the starry sky without a filter, Photo 3 was taken with a LEE No.3 filter, and Photo 4 was taken with the self-made "Strong" filter. 【How to Use】 This filter is used by attaching it to the rear of the lens. Cut it with scissors and fix the sides with double-sided tape. It can be used in either direction, regardless of front or back. Refer to Photo 5 for how to attach it to the lens. 【Compatibility】 Refer to the table in Photo 6 for the compatibility of the filter strength 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. Delivery will be via regular mail, so it may take about 5 days if it includes weekends or holidays. Thank you for your understanding.