How to prevent AE-lock when half-press?

[satay16]

Hi guys. I have this query. When I half-press to lock focus, the exposure gets locked too, which causes wrong exposures when I recompose my frame to something with different brightness. Is there anyway to prevent AE-lock while half-press on evalutive AE? (Spot and center-weighted metering doesn't have this problem)


thanks!

[SpeakUp]

lock AE b4 half press shutter

[satay16]

Originally Posted by SpeakUp lock AE b4 half press shutter

but it's going to waste some time in between that, cos have to compose, zoom in to focus, then compose again, somewhat similiar to what i'm doing currently to overcome this problem(which is focus lock, press AF/MF, then compose for the shoot). is there a setting hidden inside to tell the 7D not to AE-lock when half-press which is much faster?

[tirza]

i tried on my d7d just now.. ae doesnt lock but af yes when i press shutter halfway.. i dont know how to set it though..

[SpeakUp]

muti segment meter is almost kinda like auto mode.. sort of like point n shoot.. camera did metering calcuation for u
if u wan manual one.. use center weigh average lor

[satay16]

Originally Posted by SpeakUp muti segment meter is almost kinda like auto mode.. sort of like point n shoot.. camera did metering calcuation for u if u wan manual one.. use center weigh average lor

erm... i think i must explain alittle clearer.

this is what happened. my 7D is on evaluative metering (the one with a dot and bracket). so now, let's say i want to take this picture. to get a better focus, i zoomed in first to a particular spot and half press to get that focus i want, then i zoom out to compose, then fully depress the shutter button. however, the problem is when i half-press, my exposure got locked too, so if the spot i was focusing on is of different brightness as compared to the whole picture, my exposure get screwed up.

for spot metering and center weighted, this does not happened. even when i half press, the exposure still changes when the brightness changes. so basically, my question would be is there anyway to prevent AE-lock when half-pressing while using evaluative metering mode?

[satay16]

Originally Posted by tirza i tried on my d7d just now.. ae doesnt lock but af yes when i press shutter halfway.. i dont know how to set it though..

weird. which metering mode you on?

btw, maybe you try staying at half-pressed mode a little longer, because i noticed that the exposure is still unlocked for a second or two before being locked.

[tirza]

Originally Posted by satay16 weird. which metering mode you on?

im not sure about the name.. its the one with two brackets, the largest coverage of metering..

[rOnGrEn]

Originally Posted by satay16 , let's say i want to take this picture. to get a better focus, i zoomed in first to a particular spot and half press to get that focus i want, then i zoom out to compose, then fully depress the shutter button.

Hmmz.. i din even know can focus this way ... I always thought when you zoom in and half-press to focus, then you zoom out, the focal length has changed and the subject which you had focused on earlier will no longer be in focus...

[satay16]

Originally Posted by tirza im not sure about the name.. its the one with two brackets, the largest coverage of metering..

i think that's center weighted. try the one with an extra dot inside the brackets.

Originally Posted by rOnGrEn Hmmz.. i din even know can focus this way ... I always thought when you zoom in and half-press to focus, then you zoom out, the focal length has changed and the subject which you had focused on earlier will no longer be in focus...

cos my lens is par-focal. but i'm also just giving an example, still got other cases where i need the focus to be the same, but the exposure to be unlocked, though i find it abit hard to describe.

[tankm]

Try to lock focus first by pressing the center button of the multi-selector. You can then recompose and press the shutter fully to take the new metering and shot.

[tirza]

Originally Posted by satay16 i think that's center weighted. try the one with an extra dot inside the brackets.

ah it does ae when shutter pressed halfway.. maybe it was purposely made so, in any case you want ae you can use it..

[Trigger Happy]

i can't imagine why you'd want to shoot this way. speakup and tankm are right, but if you must, one more way is to lock onto a set exposure, keep your thumb on the AE lock button and don't take it off.

[Drudkh]

This is what I do. If you're using 7D and shooting portraits, set the front AF mode dial to MF since AF is not important in this case. The AF button is now the AF/MF button, so press that to lock focus. Now, when you half-press the shutter button, the metering will be read out accordingly in the VF, then depress fully to take the shot.

[stjustin]

y dont u AE lock the whole pict, zooom then zoom out take whole picture?

[JayKay]

Originally Posted by satay16 Hi guys. I have this query. When I half-press to lock focus, the exposure gets locked too, which causes wrong exposures when I recompose my frame to something with different brightness. Is there anyway to prevent AE-lock while half-press on evalutive AE? (Spot and center-weighted metering doesn't have this problem) thanks!

Which camera are you using?

[Agetan]

Originally Posted by satay16 Hi guys. I have this query. When I half-press to lock focus, the exposure gets locked too, which causes wrong exposures when I recompose my frame to something with different brightness. Is there anyway to prevent AE-lock while half-press on evalutive AE? (Spot and center-weighted metering doesn't have this problem) thanks!

Shoot manual. Old school.

Hart

[satay16]

i'm using 7D.

btw, seems like it is impossible to do what i'm trying to do is it? i know can do those AE lock first stuff or press the AF button to overcome this problem, but is there a setting that can just simply dun AE-lock when half pressing? basically just need to know that, cos i've been using those alternatives stated quite long already, but just abit irritated by this inconvinence.


and i dun get the fact why AE-lock only happens at evaluatiive metering only but not on the other 2. any ideas?

[satay16]

Originally Posted by Trigger Happy i can't imagine why you'd want to shoot this way. speakup and tankm are right, but if you must, one more way is to lock onto a set exposure, keep your thumb on the AE lock button and don't take it off.

let me give an example i faced today. my rsm recieves a medal from my commander. it was done in dim lighting. to get the full picture, i need to zoom to about 28mm. however, at 28mm, plus dim lighting with both of them wearing low contrast uniform, the AF isn't locking the right place very well. so, i noticed a nice shiny contrasty medal my commander was wearing. i therefore zoomed right into the medal, half-pressed to lock focus, then zoom out back to the 28mm and fully depress the button to take the picture, which is focused pretty nicely. however, the exposure was totally screwed up, because the medal was bright, and the exposure locked with the focus, my final photo became totally underexposed. it is this kind of short happenings when i feel damn fustrated because i dun have enough time to switch here switch there.

[Chee Yong]

just to understand the situation better, are you using AEL Hold or Toggle mode or AEL (spot) Hold or toggle mode?


1- Standard AEL will lock the exposure for one image in default. Or in AEL
Toggle lock the exposure for all images until the AEL button is pressed
again
2- Spot AEL will lock the metering from the Spot Area only, regardless of
which metering position the lever is set to. AEL Spot toggle locks the
exposure for all images until the AEL is pressed again.

One suggestion is to set it to toggle mode. Toggle it when you need it and press the shutter.