Lens Lab
    Tamron Extension tube for SP 90/2.5 (1:2-1:1)
    Tamron Extension tube for SP 90/2.5 (1:2-1:1)

    Tamron Extension tube for SP 90/2.5 (1:2-1:1)

    43mm · f/2.5

    Overview

    The Tamron SP 90mm f/2.5 Macro 52B Adaptall 2 is a manual-focus lens known for sharpness at f/8–f/11. It achieves 1:2 magnification natively; 1:1 requires a rare extension tube or teleconverter, which adds weight and length. Build is compact but heavy, with a plasticky feel and weak hood/caps. The Adaptall 2 system offers 26 adapters for easy mirrorless adaptation. It suits macro and portrait shooters willing to use manual focus and accessories for 1:1.