I’m after a super-telephoto zoom to use with my D7000 on safari in Africa. Can you recommend a good but inexpensive secondhand buy? Mike Mayer, via email
Jason says... Smart but sensibly priced new options on the market include Sigma Contemporary and Tamron 150-600mm lenses at around £800/$1,000. Nikon’s AF-S 200-500mm f/5.6E ED VR is a touch pricier, at £1180/$1400. For a secondhand bargain, we like the Sigma 150-500mm OS HSM.