@elkamino: definitely going to order one of those extensions, thanks for posting.
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Right on. You've a Nikon DSLR, right? I think you'll be stoked with your purchase. There is a bit of a learning curve but from the pix you've posted you obviously already know how use a camera...
For anyone using the extensions, I recommend starting off with SOLELY the smallest ring, get the technique/lighting/focus figured out and then start stacking 2 or 3 of them together. Putting the 2 largest rings or even all 3 on at the same time is kinda like using a microscope or telescope, it can be difficult to even FIND your subject in the viewfinder, let alone get it focused etc. Once dialed, just add another, then another.
Realize tho that unlike "regular" photography, sharp focus is attained not by using the focus (just turn the damn AF to OFF) but through zooming (on zoom lenses), or by physically moving further/closer to the subject. Its odd at first but it quickly becomes intuitive... but no less challenging.
As noted in an earlier post, depending on the lens you're using, the working distance can be extremely close to the flower. You'll inevitably get resin on the front element of your lens when you bump into nugs as you move fore/back for focus, but it comes right off with iso.
Anyway very cool to see the interest in this inexpensive way to get macro shots... cheers to more macro bud porn in the "fostiest" thread!