Canon 40D Auto Exposure Lock Feature

[crusher1944]

why not just use the spot meter????????? jerk

[mitiliro]

This is very timely since I was just using AE lock on my 40D in a class. The instructor used a Nikon which locked the exposure as long as you wanted. However, my 40D locks the exposure for only 4 seconds unless you hold the AE lock button. How do you get it to lock for a longer period?

[silverond]

we don't have this camera in our studio anymore, but my guess is to go into the custom menu settings and see if there is a control for changing the amount of time. Please let me know what you find out.

[keeperofthecheese]

HOPE MELONS

[psKESEY56]

An easier way might be to take an exposure off your hand (if your hand is in the same light as the subject).

[jonvideo]

That is true, much of the time the light is not the same, or might seem the same but be slightly different.

[d1ngd0ngd1ng]

Is the exposure only locked for one frame. how do you unlock the exposure. do you have to keep your finger on the exposure button if you wanted to take multi shots of same exposure. thank you for your video but you do not give very much info.

[jonvideo]

You unlock it by hitting again. Thanks for the question.

[trevorskates94]

HAHA My name is Trevor

[HankJMH]

Much poorer explanation of how to use the AE lock feature than on another YouTube video I just saw. Lot of wasted time for the last half of the video.

[JChinPhotography]

In the example given, SPOT metering on the 40D would work better when you can zoom all the way into the subject. Of course you can ZOOM in and use AE-lock too, then zoom back out to compose. Would be much better than trying to find an object with similar light levels.

As for using AE-lock, it only works in P, Tv, Av or M modes.

[i0wa88]

an the sky will be over exposed... iths much better to use flash with defusser or make a HDRI. But it's still nice vid. thx a lot :)

[peachy974]

thx for the video, it helped me with the AE settings !

[translator300]

Also spot metering does not work when you have a llight source in the center of the photo, such as when shooting a door or window to the outside world but wanting to expose the interior correctly. afaik.

But I am kinda confused as to why he needs to use the half-depression as well. I thought that the ae-lock button did the same as a half-depression of the shutter.

[albanharrison]

The half depression activates the autofocus.

[writexman]

I have a 40D, I did use AE lock button once & it did work but after few days when I click on the * button nothing happens. BTW I always shoot in manual mode.

Can you advise what settings do you have on your camera to get my AE button start working again (maybe I have modified the settings)

Plz help.

[translator300]

Somewhere in the menus there is a option for returnign the camera to the default settings.

[yasirusl]

AE lock does not work in Manual Mode, as manual mode assumes you can set the perfect exposure for the lighting in the scene.

[maiden3r]

AE lock does work in Manual mode, it's a feature you can only use on the creative zone. Your flash needs to be up, once the flash is out and u press the AE lock button, the flash will go off setting the exposure and locking it.

[sasktank]

when i lock mine on my 40d --it stays locked untill i remove the battery ? -- how do unlock it normally ?

[jbgeach]

You could also use spot metering, but I like how you demonstrated the point of the button.

Thanks

[Snoochies]

I always thought you had to hold down the * button, you taught me something! But why would you use the AE lock instead of spot metering?

[jonvideo]

You could use either in many situations, but, for example if you were doing a panorama and wanted a constant exposure across many pictures, the AE lock would be better than spot metering. With spot metering you have to get a reading each time, with AE lock you can have one setting over many pictures. Hope this helps

[Snoochies]

Yeah, that's true I have used AE lock for panoramas many times and it works great. Thanks for the video!

[crusher1944]

@jonvideo wrong jerk you have to keep pressing the star button each time you take a picture and only locks for 5-10 seconds before it has to be reset on my 40d

[jonvideo]

You thought I was a jerk, and I thought you were a nice guy, I guess we were both wrong. Oh and a tip -you can change it so you don't have to keep pushing the button, so you don't have to be mean to me, Just change the parameters in the advanced/custom menus- You will find it more rewarding than being rude.