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I just bought this as my first macro lens and I'm having a good time, but I have some questions:
1- What is the point of the protruding tube while ''zooming''? Is it really necessary? It casts a shadow on the subject I'm trying to photograph and it blocks the build-in flash of my camera.
2- Can I use an extension tube with this macro lens to go further than 1:1 magnification? Would that even be a good idea?