At 12:04 PM 4/24/01 +0300, you wrote:

>   The problem with the "macro" teleconverters is the additional 1/2-1
>stop of light loss, that reduces a f/2.8 lens to f/8 instead of f/5.6
>- as do "normal" 2X teleconverters. I suspect this is due to the
>additional extension required by the helicoid mechanism.
>   Even if very good, I'd stay away from a macro TC just for this
>reason.


Not so with the Vivitar. You lose the two stops from the teleconverter and 
that's it. Even at life-size.


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