Newly merged Kenko-Tokina has quietly launched the Tokina SD 17-35mm F4 AT-X PRO FX, a semi-fast wideangle zoom for full frame cameras. The company says the F4 maximum aperture makes it easier to produce a smaller lens with fewer aberrations, to sit alongside its 16-28mm F2.8 PRO. The lens features 'SD' glass that the company says offers similar properties to fluorite elements as well as its 'silent drive module' AF motor and high-precision AF position sensor for fast, accurate focusing. No details of pricing or availability are yet available from the company's distributors outside Japan.