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NatureTTL's Matthew Saville compares three of the most popular ultra-wide astrophotography prime lenses out there: The Samyang/Rokinon 14mm F2.8, the Samyang/Rokinon 14mm F2.4, and the Sigma 14mm F1.8 Art.
Samyang has announced that it will be making five full frame lenses in E mount, which will be the first third party optics compatible with the A7 and A7R. The lenses are all based on existing designs, namely the 14mm f/2.8 ED AS IF UMC, 24mm f/1.4 ED AS IF UMC, 35mm f/1.4 AS UMC, 85mm f/1.4 AS IF UMC, and the T-S 24mm f/3.5 ED AS UMC tilt-and-shift. All feature manual focus and aperture operation, and will be available within 2 months. As these are essentially SLR lenses with an adapter tube permanently fitted, they won't offer any of the size advantages achievable by 'native' lenses.