I already have a 105/2, but I don't have a macro lens in my arsenal. Client has asked me to photograph some jewelry, which means more than a bug/coin sized focal point for which the 105/2.8 was designed. I need something wider. I've got a 24-120 (yuck) and a 28/1.4 (yum), both of which, with enough light will yield enough depth of field, but I still can't get close enough? Question: different lens? Or perhaps an extension tube? Anyone tried something like this with an extension tube? Considerations/Gotchas I should be aware of?