Tianya digital filters are designed to improve the image quality of your camera. - Brand: Tianya - Type: Lens Filter - Application: Cross Filter Thank you for looking. This lens allows you to capture light that shines in a cross shape. Changing the angle creates X or + shapes. I bought it to photograph Christmas illuminations and used it once. I haven't had a chance to use it since, so I'm looking for someone to take it. It was stored in a dehumidified storage unit. You can buy it immediately if you have no questions. Search terms: Old lens SONY Sony PENTAX Pentax RICOH Ricoh SIGMA Sigma FUJIFILM Fujifilm Canon Canon