Roy C
Occasional bird snapper
I have a SW80ED which is 600mm, add a 1.4x tc = 840mm and shoot on a 1.6 crop Camera (40D) and the total reach should be 1344mm (600 x 1.4 x 1.6). My question is does the 80mm extension tube that I use influence/increase the focal length and if so by how much?
I have just done some focal length test with the SW combo against a Canon SX40 superzoom and just wanted to check if the extension tube alters things before reporting my findings.
I have just done some focal length test with the SW combo against a Canon SX40 superzoom and just wanted to check if the extension tube alters things before reporting my findings.