This is a polyester film that has been made thinner and easier to process. This is a homemade soft filter. It is a rear filter that attaches to the rear lens element of single-lens reflex cameras and mirrorless cameras. It was created for use in emphasizing stars in astrophotography, etc. The size is approximately 21cm x 16cm with a thickness of about 0.15mm. Since it is amateur-made, there are some uneven paint spots, but it is a large filter, so you can cut out the area with your desired filter effect using scissors or the like. For reference, please refer to the photos: the 4th photo is taken without a filter, and the 5th, 6th, and 7th photos are taken with the filter attached. ※Important Notes※ Please read before purchasing. By purchasing, you agree to all of the following notes. This is a homemade filter, so if you are looking for a perfect product, please refrain from purchasing and instead purchase a commercially available product from a manufacturer. ※We will ship with the utmost care, but we cannot guarantee against damage during shipping, so please understand. ※Please be careful as the soft processing surface may peel off if scratched with nails or hard objects, or if wiped with a wet cloth or in a wet state. We recommend that you avoid touching the processing surface as much as possible. ※Because each item is handmade, there may be slight differences in color and shape, so please understand. ※Discoloration and damage due to friction or water exposure cannot be avoided. Please understand. ※This is a delicate product, so please be careful not to apply strong force or pull on it. ※It does not have the same strength as commercially available products, and may be damaged with repeated use. ※It is not waterproof, so please avoid contact with water. ※Product prices may be changed without notice to customers due to changes in purchasing conditions, etc. ※As this is a handmade product, we do not accept price negotiations. ※This is a made-to-order product, so it will take about a week to ship. Please refrain from ordering if you are in a hurry. ※We do not accept cancellations, returns, or exchanges after an order has been placed. If you have any questions, please feel free to ask before ordering.