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Re: [OM] metabones speed booster

Subject: Re: [OM] metabones speed booster
From: Ken Norton <ken@xxxxxxxxxxx>
Date: Sat, 30 Aug 2014 09:50:28 -0500
The factor in this equation is that the 'bones adapter is changing the
focal length.

AG

On Saturday, August 30, 2014, philippe.amard <philippe.amard@xxxxxx> wrote:

> 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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> One sees clearly only with the heart. What is essential is invisible to
> the eye. Antoine de Saint Exupéry in Le Petit Prince.
> NO ARCHIVE
>
>
>
>
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>

-- 
Ken Norton
ken@xxxxxxxxxxx
http://www.zone-10.com
-- 
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