I bought this in August of this year and used it once, but I didn't really like the soft filter, so I'm selling it. I've only used it once, but it's been pre-cut for a holder like the one on the SIGMA 14mm f1.4. The cutting job isn't great, but it doesn't affect the image quality and fits securely in the holder. I've included some sample photos, so please take a look. It worked fine when I used it. Feel free to ask if you have any questions.