I’m after a macro lens with a longer focal length than my Nikon 105mm VR, for extending my shooting distance when photographing insects. Can you recommend a good secondhand buy? Kevin Bailey, via email

Jason says... Dedicated macro lenses can be expensive, so buying secondhand definitely makes sense if you’re not going to use one a lot. Here’s one that’s longer than your 105mm so you don’t have to get as close to your skittery subjects…