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[OM] Re: OM and aperture

Subject: [OM] Re: OM and aperture
From: Johan Malmström <jmalmstrom@xxxxxxx>
Date: Tue, 25 Mar 2008 21:07:09 +0100
Cc: Jez Cunningham <jez.cunningham@xxxxxxxxx>
While taking a shower and after that staring at ceiling for a while,  
this actually came to me as the way I would have done it :)

Thanks Jez, now I'm waiting for a extended version also. Would be great!

/ Johan

25 mar 2008 kl. 20.19 skrev Jez Cunningham:
>
> For sure others will provide a more accurate explanation, but in my
> understanding the little sticky out thing tells the body how many  
> stops
> difference there is between the fully-open aperture (eg f/1.8) at  
> which
> metering will take place, and the dialled-in setting (eg f/11) at  
> which the
> exposure will be made.
>
> The body just has to compute the necessary exposure (speed) setting  
> for that
> amount of light taking the 'difference' into account.
>
> Ignore all the above if you're considering how OTF TTL does it...
>
> Hope you're feeling a bit more illuminated.
>
> br
> jez
>
>
>
> On Tue, Mar 25, 2008 at 8:04 PM, Johan Malmstrom  
> <jmalmstrom@xxxxxxx> wrote:
>
>>
>> But how did the OM's do it?
>>
>> What information is actually "sent" with that little thing sticking
>> out of the lens. When comparing two lenses (35-70/3.6 and 50/1.2) I
>> can't see any difference in them?
>>
>
>
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