Hope this isn't too stupid of a question, but I have a Nikon D3100 (with the kit lenses 18-55 mm and 55-200 mm) and would like to get into wildlife and bird photography. B & H has a NIKKOR 80-400 mm lens on sale in their used dept. for $719.00. Used Nikon AF VR Zoom-NIKKOR 80-400mm f/4.5-5.6D ED Lens 1996 My only concern is that the lens was manufactured in 1996. The condition of the lens is an 8+ on B & H's site. Are their any concerns anyone has purchasing a 19 year old lens? Thank you in advance for your responses.