The Canon EF 12mm Extension Tube II is slightly smaller than half the size of the Canon EF 25mm Extension Tube II. The 25mm review is applicable to the Canon EF 12mm Extension Tube II as well.
The Canon EF 12mm Extension Tube II is pictured above with the included Canon Pouch.
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Where you buy your gear matters. You expect to get what you ordered and you want to pay a low price for it. The retailers I recommend below are the ones I trust for my own purchases. Get your Canon EF 12mm Extension Tube II now from:B&H Photo