The filter thread size of Tamron AF 18-200mm F3.5-6.3 XR Di II LD Aspherical IF Macro is 62mm.
Below are links to the filters that we recommend you to consider for your Tamron AF 18-200mm f3.5-6.3 XR II LD:
Read our detailed Tamron AF 18-200mm F3.5-6.3 XR Di II LD Aspherical IF Macro Review