These tubes are excellent. I have used them extensively with a Minolta 80-200 2.8 HS APO G. I usually only used the larger of the three tubes. Once in a while I would stack the largest and smallest tube. Sometimes I would have to use a little bit of exposure compensation. Tended to overexpose a bit. Once you get used to them you can shoot nice handheld macro's in decent light. I used them mostly for flying insects that would not stay still for long. It's a no brainer to buy these they are the best tubes on the market for this application.
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