Oly puts out a small booklet called "Olympus Manual for Macrophoto Group" I
beleave it came with my 65-166 Auto Tube, this will get you started.
The 65-116 Tube will give you .5X to 1X with 15" to 12" working distance with
your 135 f2.8. You can use your 50 f1.4 on the tube for 1.3X to 2.5X but the
working distance is reduced to 2 1/4" to 1 1/2"'s. 1:1 is not semi macro, this
is very close up stuff covering on 1"X1 1/2". Usually .5X (2" x 3") and under
is considered normal. Also consider buying a focusing rail, and a copy of
John Shaws's book "Close ups in Nature"
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