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Re: [OM] How Ken invented aperture priority (and the internet? (was "Re:

Subject: Re: [OM] How Ken invented aperture priority (and the internet? (was "Re: Fungal Friday")
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Tue, 08 May 2012 15:42:22 -0400
OK, I hear you but:
  1) why does that work and
  2) how did you figure that out

It seems to me that, with the camera set to f/2.8 but the lens set at, 
say, f/5.6 the camera would sense the ambient lighting at two stops less 
than the actual.  But, believing the camera is measuring at f/2.8 it 
would underexpose on the shutter speed.

That apparently doesn't happen.  What's wrong with my thinking?  Is it 
that the camera sees only the stopped down reading at the time of 
exposure and makes a correct exposure because of it.  If so, what's the 
relevance of telling the camera the maximum aperture?

Chuck Norcutt

On 5/8/2012 3:03 PM, Joel Wilcox wrote:
> Set the maximum aperture for the lens in EMF programming sequence for
> this, let's say for example f2.8.
>
> Put the camera in Av mode, put the *camera* aperture setting to f2.8 and
> leave it there. Set the lens to whatever aperture you want, and shoot.
>
> Joel W.
>
> On Tue, May 8, 2012, at 02:37 PM, Chuck Norcutt wrote:
>> And how is that done?  Stop down metering with the exposure compensation
>> set to correct for whatever errors are introduced by that lens and
>> aperture?
>>
>> Chuck Norcutt
>>
>>
>> On 5/8/2012 12:24 PM, Joel Wilcox wrote:
>>> However, in discovering that one of my adapters -- the Pixco from
>>> Rainbow Imaging (pray you avoid) -- is defective, I have learned how to
>>> make the good one from Big_Is work in A mode.
>> --
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