I think it has to do with whether your teleconverter goes in front of the
lens or behind it. ;-)
Giles
Tom Scales wrote:
> a 100/2.8. The 1.5 should lose you some light. I can never do the math,
> but I know a 2x converter turns a 100/2.8 into a 200/5.6, so I would
> expect the 1.5x to turn a 100/2.8 into about a 150/4.
>
> This has always confused me, so....
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