Compact and high-performance 27mm f/2.8 lens, 39mm filter thread. For Fujifilm X mount Fujifilm X mount - Model Name: TTArtisan AF 27mm f/2.8 - Filter Diameter: 39mm - Aperture: f/2.8 - f/16 Focal Length...19-70mm Maximum Aperture...f/2.1-2.8 I purchased this lens new to test the functionality of the FUJI XT1, which I am selling separately, and have only used it for about an hour, so it's like new. I didn't notice any particular problems while using it. I thought it was a very small lens with a good design and image quality. I will also include sample photos, so I hope they will be helpful. Thank you.