The X-T5 has a 40-megapixel APS-C sensor and in-body stabilisation, with Fujifilm's dial handling and film simulations. Its resolution rewards sharp lenses, and its stabilisation pairs well with Tamron's long zooms.
On the Fujifilm X-T5, every lens gives a field of view about 1.5x narrower than its focal length suggests. Below, each lens shows its full-frame equivalent on this camera. Tamron's APS-C lenses (Di III-A and the 16-50mm) are designed for this sensor size; its full-frame lenses fit too and become longer, which helps for portraits and wildlife.
The camera has in-body stabilisation, so every lens is stabilised; lenses marked VC add optical stabilisation on top, which helps most at long focal lengths.
Where to start
For most Fujifilm X-T5 owners the best first Tamron lens is the Tamron 17-70mm F2.8 Di III-A VC RXD (B070): it gives F2.8 across a 26-105mm equivalent range and resolves well on the 40-megapixel sensor.