So I was playing with the tubes and the TC with the Sigma 70 - 200 this morning and learned a few things. Lens + Tube + TC + camera makes for HUGE magnification and extremely difficult focus as I could actually see my heart beat affecting the shot as I focused.
I also learned that Lens + TC + Tube + Camera backs me out a bit from the previous combination but gives less bokeh..... but more DOF.
Here's my fav 5 from my experimenting.




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