On 4/20/2010 6:33 PM, richard mcgrath wrote:
> ...you don't have to focus it (the converter) if it's like the Vivitar
> teleconverter I have.
It isn't.
It is, in effect, a 2x TC plus a variable length extension tube between
converter and lens. That's why it's called a "Macro Focusing Teleconverter".
Moose
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