[Leica] 1.8 vs. 1.4!?!?

[john at mcmaster.co.nz (John McMaster)]

Usually not just speed differences, often a f1.8 is a superior performer 
than an f1.4 - with Leica as an exception ;-) DoF, build quality and 
size/weight are other typical differences....

john

________________________________________


2/3's as a decimal is 0.6666.
0.7251 - 0.6666  = 0.0585
Cant figure out what fraction that would be.

Bottom line a 1.4 is for sure faster than a 1.8 not by an incremental amount
like I thought.




--
Mark R.


> From: Quan Tran <quantran101 at gmail.com>
> Reply-To: Leica Users Group <lug at leica-users.org>
> Date: Wed, 2 Nov 2011 19:36:00 -0700
> To: Leica Users Group <lug at leica-users.org>
> Subject: Re: [Leica] 1.8 vs. 1.4!?!?
>
> I found this: http://imaginatorium.org/stuff/stops.htm
>
> When I select "precised", it show 0.7251 stops
> When I select "third", it gave me 2/3 stops.
>
> -Quan.
>
> On Wed, Nov 2, 2011 at 3:32 PM, Mark Rabiner <mark at rabinergroup.com> 
> wrote:
>
>> I looked up f 1.8 vs. 1.4 thinking it was between a half and a quarter of 
>> a
>> stop and they are saying its 2/3rds!?!?! Anybody know that that's true?
>>
>> Where is there a photo calculator that tells you these things?!?!?
>>