18 6 5 3 July 8, 2019 16 32 64 128 18 3 6 5 1 18 6 of 2 4 5 6 3 Tamron 18 200 f3 5 6 3 (- 18 )- 3 5 2 6 Sigma 18 200mm f3 5 6 3 Evaluate (- 18 )+ 6 3 5 92 18 6 of 5 3 25 30 18 6 5 (- 6 3x 5 18 8n 6 (- 5 3 )= 18 7n 18 6 x 30 5 6 18 6 3 2x 5 18 3 5 6 4 18 3 8 6 5 18 45mm f 4 5 6 3 is stm