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 Post subject: Metering help
PostPosted: Fri Jan 24, 2014 8:11 pm 
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Joined: Sun Jan 06, 2013 6:09 pm
Posts: 57
Can any one explain metering modes to me... I get the difference between matrix. Centre and spot. And I get its measuring light on/ around the subject. ? Right?
What effect does this have on iso ect.
Im confused as to which to use and when..... and what settings if any I need to adjust in relation to it..... ?

Cheers

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 Post subject: Re: Metering help
PostPosted: Mon Jan 27, 2014 7:16 am 
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Joined: Thu Jan 26, 2006 10:41 pm
Posts: 366
As far as I know:

MATRIX - uses an image database to discern the subject and apply the best exposure levels, taking into account meter readings..

CENTRE - measures the light levels, giving greater weight to the centre of the frame without reference to the database.

SPOT - same rationale as centre but only measures a small area in the centre of the frame.

I'm open to correction!

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 Post subject: Re: Metering help
PostPosted: Mon Jan 27, 2014 9:16 pm 
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Joined: Mon Sep 13, 2010 7:01 pm
Posts: 1230
Location: NW England
As Hilary said above.

My main subject is birds & I tend to set metering to either `spot` or `centre weighted`, because in general I'm more interested in the bird than the scene.
(The other thing to consider is setting `focus points`. For birds I use `spot` focussing, either single or 9 points.)

It depends what you are shooting really & what your priority is, be it a wide landscape with an average exposure for the whole scene, or a small bird against a bright blue sky (or indeed the same bird in a tree against a darker background)

ISO will be affected depending on what the camera is set at & how wide (averaged over the whole scene for Matrix) or narrow (for Spot) you want the metering system to analyse.

ISO for a dark coloured bird will be different from a white bird, even if they are on the same perch, with spot metering, but if set to Matrix there probably wouldn't be much difference. (depending how far away they were from the camera/lens & how wide the scene is though.)

Not sure I've explained correctly.........or made it more confusing! :lol: (it's easier to do than explain)

Next time you're out, shoot the same scene in all 3 modes then compare when you get home to see the difference.
Try a landscape type shot and also something smaller/nearer too.

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 Post subject: Re: Metering help
PostPosted: Mon Jan 27, 2014 10:15 pm 
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Joined: Sun Jan 06, 2013 6:09 pm
Posts: 57
Cheers carlos. The birds are a good way for me to understand it....which explains why my owls shots aint quite right.

Practice practice ! Thanks buddy

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 Post subject: Re: Metering help
PostPosted: Mon Jan 27, 2014 10:42 pm 
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Location: NW England
Another thing to utilize is `EV` (can be a great help, especially with birds)

If you have a bird in less than ideal light, say in a shady bush, dial in some -EV.
Conversely, if you are shooting a bird in flight, or perched atop a tree & its against a bright sky, dial in some +EV.

It makes a real difference. 8)

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