【Overview】 This is a self-made rear sheet filter for astrophotography, created as a replacement for the discontinued Lee Rear Soft Filter No. 3. (Photo 1) Sales began last January, and thanks to your support, over 150 people are currently using the "Medium" and "Strong" versions combined. 【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 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. I cannot provide links here, so please search for "sakuranomasu" on social media for other examples. 【How to Use】 This filter is used by attaching it to the rear of the lens. Cut it with scissors, etc., and secure the sides with slightly thick 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】 Please 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】 While we manufacture with the utmost care, please refrain from purchasing if you are looking for a perfect product. Delivery will be via regular mail, so please understand that it may take about 5 days if it includes weekends or holidays.