The filter thread size of Tamron AF 18-250mm F3.5-6.3 Di II LD Aspherical IF Macro is 62mm.
Below are links to the filters that we recommend you to consider for your Tamron AF 18-250mm f3.5-6.3 II LD:
Read our detailed Tamron AF 18-250mm F3.5-6.3 Di II LD Aspherical IF Macro Review