TTArtisan's ultra-wide for Sony APS-C — the manual 10mm f/2 fisheye-adjacent prime.
The TTArtisan 10mm f/2 is a fast ultra-wide manual-focus prime from TTArtisan for Sony E-mount APS-C cameras, providing a 15mm full-frame equivalent field of view. The f/2 maximum aperture is unusually fast for a 10mm ultra-wide lens, making it particularly suited to astrophotography on APS-C bodies.
The lens delivers 10mm (15mm equivalent on APS-C) at f/2 maximum aperture with entirely manual focus and aperture control, a metal barrel construction, Sony E-mount coupling, and an APS-C image circle. No autofocus or electronic communication is provided.
The f/2 aperture at 10mm ultra-wide gives Sony E-mount APS-C photographers strong light-gathering capability for night sky, aurora, and astrophotography use cases where wide and fast optics are the primary requirement. Manual focus is adequate for astrophotography since subjects are at infinity. It competes with the Sigma 16mm f/1.4 DC DN in the fast APS-C wide prime segment at a lower price.
Check focus ring smoothness and verify infinity focus accuracy — essential for astrophotography use. Inspect aperture ring detents for positive operation. Examine the front element for coating integrity. Confirm APS-C image circle with no vignetting at f/2 on Sony E-mount APS-C bodies. Test corner sharpness at f/2.