At 8:17 PM -0400 3/12/07, Wayne S wrote:
Then why would Canon mention that the 25mm extension tube is
compatible with the 135/2.

Of course it's compatible. There just are better solutions to get good quality.

I'm not sure where to find the Canon spec
with regard to extension tubes.

Wayne S

At 05:22 PM 3/12/2007, you wrote:
Adding extension tubes forces the lens "out of spec",  unless the lens is
 >designed specifically to be used with bellows or extension tubes.

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