Metabones do claim an extra stop, and say that the effective focal length
is 0.71x the actual. And the maths confirms that you do get a full stop. So
a 50/1.2 would be an effective 35/0.8. And a 24/2 - a 17/1.4.
Piers
On 29 Aug 2014 22:17, "Frank" <wijsmuller@xxxxxxxxx> wrote:
> Don't have one, but shouldn't a speedbooster give you an additional stop?
> To get a 180/1.4 equivalent? Or a 35-80/2? Hope you will elaborate on the
> results..
>
> Best, Frank.
>
>
> 2014-08-29 14:29 GMT+02:00 SwissPace <ian@xxxxxxxxxxxxxxxx>:
>
> > Last night I was idly searching the internet and before my frontal lobe
> > could kick in a speedbooster for OM to X-Mount was ordered.
> >
> > Buyers remorse is kicking in slightly as I begin to ponder the point, its
> > nice to have the extra reach the crop sensor gives for teles so why
> would I
> > want to lose that and as good as the 24/2.8 is I don't see me using it
> > instead of the fuji 14/2.8 (21mm equiv) , I do have a 17mm tokina kicking
> > around plus the 8/2.8 and 35 shift and well maybe I will like using the
> > 180/2 and 35-80/2.8 with it, but I guess the 90/2 100/2.8 etc.. will not
> > see much if any use.
> >
> > Has anyone else actually bought one and is using it with OM lenses to
> > whatever camera mount you chose? any thoughts?
> >
> > IanW
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