I am looking for a quality zoom for wildlife (mainly birds) to marry with a Nikon D7100. Would the Nikon AF-S 28-300mm (FX format)
f/3.5-5.6G IF ED VR Lens have any advantages over the AF-S DX NIKKOR 18-300mm f/3.5-5.6G ED VR for wildlife photography?
Also, why is the AF-S DX NIKKOR 55-300mm f/4.5-5.6G ED VR so much cheaper than both these lenses?