Thanks for the replies.
Extension tubes certainly sound like the way to go, but I'm unsure how much benefit they will be for longer focal length lenses, if the main aim is get maximum magnification.
Presumably the tubes work by effectively shortening the minimum focusing distance between the camera and the subject, thus allowing you to go beyond 1:1. I can see how this extension of say 60mm would significantly affect a 50mm lens, but how much affect would it have on say a 105mm or a 180mm, which presumably have a larger min focusing distance?
Given this, what lenses do you use your tubes on?
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