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Manual Extension Tubes - Loss of contrast ?

I've used a 12mm tube with a 350D and 18-55mm lens for these and i didn't notice any contrast loss. It's only 12mm though.
Wasp.jpg


Wasp1.jpg


Slug8.jpg


DragonFly.jpg
 
I bought this set on ebay:
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Is there a way to obtain the size in milimeters of each tube? Do I need to use a ruler?
 

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