Auto extension tubes

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Trevor Carpenter
Trevor Carpenter Forum Pro • Posts: 17,488
Auto extension tubes

Always on my list of maybe purchases is a set of auto extension tubes, probably the Pixcos, cheap and well thought of.

I currently use my Oly 60mm for mainly stationary small insects and my PL100-400 for larger beasts, large butterflies and dragonflies etc. I also own a Panny 14-140. How do I understand the effect of using the extension tubes with any of the above lenses. I had thought I would be using them with the 60mm but the most common use seems to be with a non macro lens as a substitute for a real macro lens. Is there a calculator which gives the working distance and the magnification effect?

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Recent and not so recent pictures here https://trevorc28a.wixsite.com/trevspics

 Trevor Carpenter's gear list:Trevor Carpenter's gear list
Panasonic G85 Panasonic Lumix DC-G9 Olympus M.Zuiko Digital ED 60mm F2.8 Macro Panasonic Lumix G Vario 14-140mm F3.5-5.6 O.I.S Panasonic Leica 100-400mm F4.0-6.3 ASPH
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