I have just ordered from B&H the Kenko 10 & 16mm auto-capable extensions set for m4/3, which was out of stock at the time of order. Anybody know how long it might take for them to be in stock again? And has anyone used this recently released gear yet. I aim to use it mainly on my 45mm Macro Elmarit f2.8 —how many stops of light are lost with the respective and combined rings? Thanks, iGonzoid.