Wiki: "the f-number N = f / D, with focal length f and aperture
diameter D."
The actual amount of light that goes through the lens remains the
same, just the math tricks us into believing that we gain anything in
term of f-stop ;-)
I bet the light-meter won't be fooled by the advert.
Amities
Philippe
Le 30 août 14 à 15:17, Piers Hemy a écrit :
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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