The Irix 15mm f/2.4 is an ultra-wide-angle lens compatible with both full-frame and APS-C Canon, Nikon, and Pentax K cameras. Here are its main uses: Landscape Photography: The 15mm focal length allows you to capture expansive vistas, dramatic landscapes, and wide scenes. Astrophotography: With its fast maximum aperture of f/2.4, the Irix 15mm is advantageous for shooting the night sky, stars, and celestial events. Night Photography: The lens features an “Infinity Click” feature, making it ideal for nighttime shots, especially when focusing on distant objects. Urban Architecture: It’s well-suited for capturing cityscapes, buildings, and architectural details. Overall, the Irix 15mm f/2.4 combines excellent optics and build quality, making it a versatile choice for creative photography