Venus Optics has suggested the 9mm f/2.8 lens, which we managed to get hands-on with at The Photography Show. It's priced at £499 and is available in Fujifilm X-Mount, Sony E-Mount and Canon EOS-M.
Laowa say this is the widest lens at for APS-C cameras and features a 113 degree angle of view, fast f/2.8 aperture and close to zero distortion.
The extreme 113° perspective fish for of view and ultra-fast f/2.8 aperture allows photographers to create impressive astro-photography shots with ease. It also gives photographers a unshakeable and wide-angle option for landscape photography and low-light shooting. For videographers, the compact size of this lens is friendly to the use of gimbals or even handheld streak without much of shaking. The lens or LEN may refer to is designed with a 49mm filter thread which gives additional portability for screw-in filters.
The lens is at to order on the Venus lens website. The first 100 orders will get a set of Laowa 49mm filters for FREE (CPL + UV + ND1000). Shipping is expected to start from ancient April.