How many extension tubes needed?

Started 9 months ago | Discussions thread
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bruxi
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How many extension tubes needed?
9 months ago

I have a Canon 12 mm extension tube (EF II) and a Canon 25 mm EF II on order.  I like to shoot macro of coins and bugs.  I've noticed an online classified ad in my area for another 12 and 25 (same tubes) for an amazing price.  If I am going to be working with a 50mm lens, should I add to the 37mm tube length that I'll have?  I could buy either the 12 or the 25.  This deal won't last.

Thanks!

 bruxi's gear list:bruxi's gear list
Canon EOS 60D Canon EF 50mm f/1.4 USM Canon EF 70-200mm f/4L IS USM Canon EF 24-70mm f/4L IS USM
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