10mm ultra-wide-angle lens with an aperture of F2.8. Purchased new in 2021 at Yodobashi Camera. Used with an EOS 70D and EOS 90D, primarily for astrophotography. No longer needed as I recently upgraded my camera. This is a single-focus manual lens. It's for APS-C cameras, so vignetting will likely occur if used on a full-frame camera. When the focus ring is turned to infinity, the stars come into perfect focus. There is no play in the focus at infinity, so please be aware of this if it concerns you. Because it's a fisheye lens, a lens protector cannot be attached. I used it with extreme care. The last photo is a picture of the starry sky taken with this lens. It was taken with an EOS 90D and only the brightness was adjusted in Lightroom. I haven't corrected for distortion, but the horizon isn't very curved, which I think is good for an inexpensive lens. The stars are slightly blurred towards the edges of the frame, but considering the price, I was personally satisfied with it. - Brand: SAMYANG - Model Name: F2.8/10mm - Lens Type: Ultra-wide-angle lens - Maximum Aperture: F2.8 - Focal Length: 10mm - Features: ED AS NCS OS Thank you for looking. Focal Length: ~10mm Maximum Aperture: 2.1~2.8 Other Features: Lens hood included, front lens cap included, rear lens cap included