The filter thread size of Tamron AF 28-200mm F3.8-5.6 XR Di Aspherical IF Macro is 62mm.
Below are links to the filters that we recommend you to consider for your Tamron AF 28-200mm f3.8-5.6 XR:
Read our detailed Tamron AF 28-200mm F3.8-5.6 XR Di Aspherical IF Macro Review