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Originally Posted by steveb
There's no glass whatsoever in the extension tubes! I guess I'll just have to draw you a picture!
Here you can see the tubes separated. There are four different widths. In the lower two pix, two of the tubes have been inserted between the camera body and the lens unit.
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Duh!! OK sorry, I thought you were referring to an extender like this
Canon EF 1.4x II Extender Review
Quote: Because the Canon EF 1.4x II Extender is multiplying the aberrations/flaws of the lens it is mounted behind by 1.4x, there will be some degradation in image quality when using the 1.4x. Sharpness (especially in the corners) and contrast are modestly reduced - stopping down shows lens degradation.
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Thanks for your patience and I appreciate the clarification - I will definitely look into it.
