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Re: [OM] Av with chipped adapters

Subject: Re: [OM] Av with chipped adapters
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Tue, 15 May 2012 20:26:32 -0400
I finally dug out the big-IS chipped adapter today and programmed it for 
use with my Vivitar Series 1 90/2.5 macro.  By the time I got done 
programming it I was running out of light and time to experiment but I 
did try all three modes, A, B and AV.  I think I had it programmed 
properly since A and B both gave me f/5.6 in the EXIF which was the 
actual value of the aperture and value set on the camera.  The AV mode 
gave me f/2.5 (max aperture) as it was supposed to.  However, only the B 
mode gave me a good exposure.  The A mode was about 2 stops overexposed 
and the AV mode about 2/3 stop overexposed.  But the B mode produced a 
better exposure than the Tamron 24-135 I installed as a test case.  When 
set to 90mm and f/5.6 it was also over exposed by 1/3-2/3 stop.

I may still be (and probably am) doing some things wrong so I'll do some 
more testing later on, preferably with a gray card for consistency.  But 
it seems like such a fussy process that I think I'd just take a couple 
of quick test exposures and set the camera to shoot to the right... 
especially if it's on a tripod.

Chuck Norcutt


On 5/14/2012 12:53 PM, Joel Wilcox wrote:
> On Thu, May 10, 2012, at 10:09 PM, Joel Wilcox wrote:
>
>> MODE A:
>>
>> 1. Set the maximum aperture on lens
>> 2. Set the desired aperture on camera
>> 3. Focus and meter the object, when focus is achieved, lock exposure
>> setting.
>> 4. Set the lens aperture to the same desired aperture as the camera
>> setting
>> 5. Press shutter button and take the picture.
>>
>
> While I have confirmed that this works, I am having a little trouble in
> that the camera won't lock the exposure for any longer than the display
> stays lit.  Trip the shutter slightly to bring up the display after
> stopping down and the meter has reset and the exposure is now wrong.
>
> So I read in the manual that the only way really to lock AEL is to keep
> your thumb on the AEL button -- a PITA if, for example, the camera is
> amounted on tripod and one is doing all the other things one does when
> one makes the choice of using a tripod (like maintaining precise focus)
> instead of just shooting away.
>
> E-system cameras have a AEL "memo" feature.  This allows the AEL to
> persist for as many shots as one likes.  I have not been able to find
> any counterpart to this on the 5D.  Other than manual mode.  Am I
> missing something, fellow canonistas?
>
> Joel W.
>
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