Re: Nikon extension tube with teleconverter

C J Campbell wrote:

Nikon's AF-S TC series of teleconverters can only be used with a small number of lenses because the teleconverters are designed in such a way that the rear element of most lenses will contact the front element of the teleconverter, possibly breaking them. You can only use the teleconverters with lenses that have deeply recessed rear elements, such as the 70-200mm AF-S VR.

Suppose, though, you put an extension tube between the teleconverter and the lens, so that the lens elements cannot contact each other. What would be the effect on picture quality and exposure?

Oh, and I'm unable to mount my ancient pre-Ai E2 14mm extension tube to the front of my AF-S teleconverters, only to the back. It starts mounting but won't tighten & snap all the way. This may not be true for newer tubes. I can do it but it's not secure and obviously there is no aperture or AF connection (but this tube doesn't have that anyways).

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