currentlt have a Nikon AF-S DX NIKKOR 55-300mm f/4.5-5.6G ED VR kit lens with a 1.4 tele convertor would a Sigma 120-400mm f4.5-5.6 APO DG OS be worth upgrading to for wildlife photography ?
think i can pick one up for £600ish
think i can pick one up for £600ish