Actually very close, 2**pi =8.82, but 3.17 stops is closer !
The exposure compensation for a 3x converter = 9.
...Wayne
> Clay Nichols <Clay.Nichols@xxxxxxxxxxxxxxxxxx> wrote:
>
> 3X cost you Pi??
>
> >>> Andrew Fildes <afildes@xxxxxxxxxxxxx> 09/29/09 7:48 PM >>>
> 1.4x costs you exactly one stop, 2x cost two stops. That's my
> understanding. Some sort of geometric, logarithmic scale thingy. I
> suppose a 3x costs you 3.141..... stops :-)
> Andrew Fildes
> afildes@xxxxxxxxxxxxx
>
>
>
> On 30/09/2009, at 9:35 AM, Clay Nichols wrote:
>
> > Why are the Olympus teleconverters rated at 1.4x mag instead of
> > 1.5x which is half of the 2x teleconverter?
>
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...Wayne
Wayne Harridge
http://lrh.structuregraphs.com
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