Author Topic: AE Lock button can anybody explain in layman terms how to use it  (Read 5385 times)

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Offline eddieitman

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Ok i have read the manuals and maybe i am getting confused the way i am understanding it is that the AE lock does is it locks the light levels in 1 place and then allows like a second metering to be taken of the subject . Is that t correct?
How would i use it correctly as some of the things i read say point the camera at the floor and do AE lock then for example focus on the subject and take the picture.
Could somebody explain AE lock in nice simple layman terms.
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Offline ronny

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Re: AE Lock button can anybody explain in layman terms how to use it
« Reply #1 on: September 21, 2010, 02:49:18 PM »
What AE lock does is you point the camera at a subject,
then press the shutter button part way down to activate the light meter,
then press the AE Lock button.

What ever the light meter read at that time is now locked in.
If the meter read the light at 1/125 F5.6 that is where the exposure stays no mater where you
point the camera.

Example, You have a dark background and the subject will be sun lit. Because of the dark
background the exposure will over expose the sun lit subject.

Hope this helps.

Ron N.
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Offline Clive

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Re: AE Lock button can anybody explain in layman terms how to use it
« Reply #2 on: September 21, 2010, 03:19:49 PM »
Hi eddieitman

ronny is correct.

Below is an example of how AE might be used. This was actually shot in M mode but the effect is about the same. In A mode the exposure here becomes tricky because of the contrast. Using the AE lock, you could point the camera at some grass or leaves (a nice neutral subject, with average reflectance..provided the grass/leaves are in the same light as the subject) and depress the release part way ... THEN push the AE button to lock the correct exposure. Swing back to the bird and shoot. If you are taking alot of shots it is just easier to shoot the grass first in (say) A mode. Check the exposure and if "correct," duplicate that exposure in M mode. Then you can shoot away at the white-headed bird and the exposures will be "correct" and you won't burn out the whites.

Make sense?   

Clive

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Offline eddieitman

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Re: AE Lock button can anybody explain in layman terms how to use it
« Reply #3 on: September 21, 2010, 03:55:26 PM »
That makes sense will get a look at the images later on as they are blocked at work.
Many thanks for the response
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Offline Faldrax

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Re: AE Lock button can anybody explain in layman terms how to use it
« Reply #4 on: September 22, 2010, 10:23:34 AM »
One thing to note is that the AE lock button can be configured (deep in the menus!) to either be 'hold' or 'toggle'.

In hold mode, you need to keep the button pressed to keep the AE lock, in toggle you press to lock, then press again to release. Either way you will see a '*' in the viewfinder / rear display to show when it is locked.

I found setting to toggle was much easier to use, but did occasionally forget to release after I had taken the shot...
AE lock is also useful if taking panoramas, as you want them all to have the same exposure.
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Offline Clive

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Re: AE Lock button can anybody explain in layman terms how to use it
« Reply #5 on: September 22, 2010, 04:37:19 PM »
Good point Faldrax. Thanks.

It is impossible to hold the AF/MF button and the AE button at the same time. The toggle would get around that.

Thanks

Clive
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Offline rannari

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Re: AE Lock button can anybody explain in layman terms how to use it
« Reply #6 on: September 22, 2010, 06:53:28 PM »
... and if you use spotmetering together with AE lock, you will get more precise exposure, especially useful in macros (and as a part of learning curve to understand exposure in different conditions).

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Offline Gbags

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Re: AE Lock button can anybody explain in layman terms how to use it
« Reply #7 on: October 07, 2010, 09:45:19 PM »
Thanks Guys, that has been helpful to me also.

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