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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 27 Jun 2011 (Monday) 02:06
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Probably... a stupid question (EOS 40D)

 
obkcaptain
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Jun 27, 2011 02:06 |  #1

Dears:
I'm owner of an excellent EOS 40D for the last 3 years...
There is a little incovenient that I haven't fit correctly.
I'm using always the "center point" of the 9 point focus.
Shooting with my zoom Tamron (18/270 IS), when in 200 or above, when I "catch the focus" I need to compensate the exposition dependindg on if the "point focus" is dark or bright. If it's bright, closing 1/2, 2/3 even 1 f stop. Or, if it's dark, opening ...
Does anybody know how to SEPARATE the function "Focus" / "Exposition" when I shoot?
I've read repeteadly the manual (C Fn IV, for instance).
My goal would be: Using the little red point to focus, not to expose. Otherwise, I need to carry a lightmeter...(as when I was on my old Minolta)


A Canon gear, some lenses, mono(tri)pod, flash and need to learn...

  
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LudwigVB
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Jun 27, 2011 02:46 |  #2

I think if you use evaluative metering, it will do what you want.




  
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Bazz8
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Jun 27, 2011 02:55 |  #3

obkcaptain wrote in post #12663526 (external link)
Dears:
I'm owner of an excellent EOS 40D for the last 3 years...
There is a little incovenient that I haven't fit correctly.
I'm using always the "center point" of the 9 point focus.
Shooting with my zoom Tamron (18/270 IS), when in 200 or above, when I "catch the focus" I need to compensate the exposition dependindg on if the "point focus" is dark or bright. If it's bright, closing 1/2, 2/3 even 1 f stop. Or, if it's dark, opening ...
Does anybody know how to SEPARATE the function "Focus" / "Exposition" when I shoot?
I've read repeteadly the manual (C Fn IV, for instance).
My goal would be: Using the little red point to focus, not to expose. Otherwise, I need to carry a lightmeter...(as when I was on my old Minolta)

try backbutton focus this may help


Gear List : SLR BODIES: Eos 5, Eos 3, D30 ( GIFT TO SON INLAW) 40D( SOLD) 1DMK3 ( Current Body)
LENSES : 28-105 USM ( WENT WITH D30) 50MM1.8 , 20-35MM F 2.8 L , 17-40MM F 4.0 L , 90MM MACRO F 2.8 TAMRON 75-300 F4-5.6 USM , 200MM MK11 2.8 L , 400mm 5.6L
TRYPOD: MANFROTTO 190 WITH MEDIUM FORMAT 3WAY HEAD, MANFROTTO MONOPOD LARGE SIZE.

  
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hennie
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Jun 27, 2011 04:03 |  #4

Indeed, by using custom function IV -1 you can set the way your Shutter button / AF-ON Button work. I gues that setting it to 3 (AE lock / Metering + AF start) is the setting you need.
This function is described on page 160 of the english Instruction Manual.




  
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Hermeto
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Jun 27, 2011 05:52 |  #5
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obkcaptain wrote in post #12663526 (external link)
Dears:
I'm owner of an excellent EOS 40D for the last 3 years...
There is a little incovenient that I haven't fit correctly.
I'm using always the "center point" of the 9 point focus.
Shooting with my zoom Tamron (18/270 IS), when in 200 or above, when I "catch the focus" I need to compensate the exposition dependindg on if the "point focus" is dark or bright. If it's bright, closing 1/2, 2/3 even 1 f stop. Or, if it's dark, opening ...
Does anybody know how to SEPARATE the function "Focus" / "Exposition" when I shoot?
I've read repeteadly the manual (C Fn IV, for instance).
My goal would be: Using the little red point to focus, not to expose. Otherwise, I need to carry a lightmeter...(as when I was on my old Minolta)

C.Fn. IV has nothing to do with your problem, you have to understand Metering Modes and chose the one the suites you style of shooting the best.
There are hundreds of articles, instructions and videos on that subject, both in POTN and across the Web, here are just couple of them:

http://www.cambridgein​colour.com/tutorials/c​amera-metering.htm (external link)

http://www.5min.com …---Canon-40D-DVD-72415965 (external link)

http://www.google.ca …1fa99ccae&biw=9​47&bih=803 (external link)


What we see depends mainly on what we look for.

  
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MrChad
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Jun 27, 2011 09:20 as a reply to  @ Hermeto's post |  #6

The 40d isn't meant to focus/meter beyond f5.6. Thus the tammy's long end at f6.3 tricks the 40d to work properly. That may be the af and meter issue beyond the 200mm end.


I kaNt sPeL...
[Gear List]

  
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Probably... a stupid question (EOS 40D)
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