For most close-up photography I recommend a DSLR and a macro lens or reversed lens. But, for most macro lenses you get extremely close to the subject. If you use a DSLR keep in mind that the mm of the lens (eg. 50, 100, 200) means how far it can zoom in from a distance. On a 50mm lens taking a macro picture you will need to be extremely close to the subject. But, on a 200mm lens, you can be a bit further away to take the picture. You could also use teleconverters and/or extension tubes (I made a little write-up about them here) but they still have some faults. No matter what you get you should find someone that has that setup or test it first, to make sure that you can get close-up pictures without getting too close to the scorpion.
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