The filter thread size of Tamron AF 28-300mm F3.5-6.3 XR Di LD Aspherical IF Macro is 62mm.
Below are links to the filters that we recommend you to consider for your Tamron AF 28-300mm f3.5-6.3 XR LD:
Read our detailed Tamron AF 28-300mm F3.5-6.3 XR Di LD Aspherical IF Macro Review