Tamron is giving Sony full-frame mirrorless shooters a reason to get excited today. In a video published to the brand’s Facebook page and YouTube channel, the company is teasing four new lenses for FE-mount: one zoom lens and three primes. Unfortunately, the teaser doesn’t give much away other than making it pretty obvious that these will be full-frame mirrorless lenses for the Sony system. The teaser opens with a shot of the current Tamron 17-28mm f/2.8 Di III RXD and…