Focus Points !

Marshy · 10th of April 2005 (Sun)

With the 300D there are two choices , : 1 camera does what it wants ie auto , : 2 single focus point . Ideally i would prefer choices of focus points in between the two options . I know the 20D
has 9 points but is it the same as 300 in choice ?

GeForceFX · 10th of April 2005 (Sun)

what do you mean?
you want to select 2 points yourself?

tim · 10th of April 2005 (Sun)

In single focus point mode you get to choose which focus point you want to use. The 20d has 9 points, the 300D has 5 or 7, I forget which, but you can choose which you want to use. I usually use the centre point, though when i'm using a small aperture I use a different focus point rather than focus-recompose, as focus/recompose can stuff the focus up.

Jesper · 10th of April 2005 (Sun)

What exactly do you mean - do you want to be able to choose multiple focus points manually? That can't be done with the 300D, 350D, 10D and 20D.

The 10D (and probably the other cameras also) has an A-DEP mode (Automatic Depth of Field). When you set the camera to this mode, it chooses an aperture so that everything covered by the AF points will be sharp. Look it up in the manual.

My EOS 30 (Elan 7E in the USA) doesn't have A-DEP, but DEP mode. In that mode you first focus on one subject, then on the other, and the camera chooses an aperture so that both subjects are sharp (inside the depth of field). I've never used it a lot, but DEP mode is probably more useful than A-DEP, since you can choose two points to focus on yourself.

Marshy · 10th of April 2005 (Sun)

Quote:

Originally Posted by Jesper

What exactly do you mean - do you want to be able to choose multiple focus points manually? That can't be done with the 300D, 350D, 10D and 20D.

The 10D (and probably the other cameras also) has an A-DEP mode (Automatic Depth of Field). When you set the camera to this mode, it chooses an aperture so that everything covered by the AF points will be sharp. Look it up in the manual.

My EOS 30 (Elan 7E in the USA) doesn't have A-DEP, but DEP mode. In that mode you first focus on one subject, then on the other, and the camera chooses an aperture so that both subjects are sharp (inside the depth of field). I've never used it a lot, but DEP mode is probably more useful than A-DEP, since you can choose two points to focus on yourself.

It would be wonderful if two focus points could be selected instead of one or all . I normally use the centre point but yesterday at my daughters party i wanted a natural pic not posed of two girls who weren,t exactly side by side , small gap in between them and like you rightly suggest A-DEP sounded the ideal choice . Girl on left great focus ( nearest girl ) , girl on right blurred . Checked in Breezebrowser and focus was mainly showing on girl on right doesn,t make sense . Love the 300D but focussing is hit and miss sometimes especially with two objects not side by side . Pics were taken with 50mm 1.8 , 1/60 and F22 .

Hellashot · 10th of April 2005 (Sun)

Please post the image.

Marshy · 10th of April 2005 (Sun)

Quote:

Originally Posted by Hellashot

Please post the image.

My left and rights were wrong way round !

thomasrhee · 10th of April 2005 (Sun)

If you want 2 objects in focus which are not on the same plane, you need to increase your DOF by selecting a higher aperture depending on how far apart those 2 objects are.

If you're using A-DEP mode, you need to check whether the focus points have latched onto whatever you want to be in focus. I never use this mode since it's more trouble than it's worth and sometimes a hit or miss if you're not careful. IMO, better to use Av mode and select the right aperture setting for the amount of DOF you want.

PacAce · 10th of April 2005 (Sun)

Quote:

Originally Posted by Marshy

My left and rights were wrong way round !

Are you sure you were using f/22? The DOF sure seems very shallow for an aperture of f/22. With a 50mm lens at f/22, if you were at least 10 feet away from the subjects, you should have been able to get everybody in focus. Were you closer than 10 feet away?

Marvinspu36 · 10th of April 2005 (Sun)

Must be a stuttering finger, cause it looks more like f2 at 10 feet for a 50mm. That gives you a little over a foot of DOF, which would be enough to keep the one girl mostly in focus, and everything else out of focus.

Skip Souza · 10th of April 2005 (Sun)

Quote:

Originally Posted by PacAce

Are you sure you were using f/22? The DOF sure seems very shallow for an aperture of f/22. With a 50mm lens at f/22, if you were at least 10 feet away from the subjects, you should have been able to get everybody in focus. Were you closer than 10 feet away?

The same pic was posted in another thread and the f stop given was f/2.2 which seems more like it.

10th of April 2005 (Sun)	#1
Marshy Member Join Date: Mar 2003 Posts: 79	Focus Points ! With the 300D there are two choices , : 1 camera does what it wants ie auto , : 2 single focus point . Ideally i would prefer choices of focus points in between the two options . I know the 20D has 9 points but is it the same as 300 in choice ?

10th of April 2005 (Sun)	#2
GeForceFX Member Join Date: Dec 2004 Location: belgium Posts: 528 IMAGE EDITING OK	Re: Focus Points ! what do you mean? you want to select 2 points yourself? __________________ Forgive me for my sucky English, but it's probable better than your dutch 1DmkIII / 500D / 20D / 2 x POTN strap / speedlite 580EX EF-S 10-22 / EF 17-40 L / EF 100-400 L / EF 24-105 L / EF 50 F1.8 II / sigma 150mm F2.8 macro manfrotto monopod and tripod and some heads / photoshop CS4 / lightroom 2.4 / WACOM Intuos3 A5 / Canon MP600R my gallery

10th of April 2005 (Sun)	#3
tim Light Bringer Join Date: Nov 2004 Location: Wellington, New Zealand Posts: 47,923 IMAGE EDITING OK	Re: Focus Points ! In single focus point mode you get to choose which focus point you want to use. The 20d has 9 points, the 300D has 5 or 7, I forget which, but you can choose which you want to use. I usually use the centre point, though when i'm using a small aperture I use a different focus point rather than focus-recompose, as focus/recompose can stuff the focus up. __________________ NZIPP Qualified Professional wedding photographer. Camera and Lens Reviews ~ Wellington Wedding Photographer Wellington Wedding Photographer (site2) ~ Wellington Wedding Photographer (site3) Read all my FAQs (wedding, printing, lighting, books, etc)

10th of April 2005 (Sun)	#4
Jesper Goldmember Join Date: Oct 2003 Location: The Netherlands Posts: 2,742	Re: Focus Points ! What exactly do you mean - do you want to be able to choose multiple focus points manually? That can't be done with the 300D, 350D, 10D and 20D. The 10D (and probably the other cameras also) has an A-DEP mode (Automatic Depth of Field). When you set the camera to this mode, it chooses an aperture so that everything covered by the AF points will be sharp. Look it up in the manual. My EOS 30 (Elan 7E in the USA) doesn't have A-DEP, but DEP mode. In that mode you first focus on one subject, then on the other, and the camera chooses an aperture so that both subjects are sharp (inside the depth of field). I've never used it a lot, but DEP mode is probably more useful than A-DEP, since you can choose two points to focus on yourself. __________________ Please visit my gallery! Canon EOS 5D EF 24-105 f/4 L IS, EF 70-200 f/4 L IS, EF 35 f/2, EF 50 f/1.8 II, EF 100 f/2.8 Macro USM Extender EF 1.4x II, Speedlite 550EX

10th of April 2005 (Sun)	#6
Hellashot User is banned from forums Join Date: Sep 2004 Location: USA Posts: 4,617	Re: Focus Points ! Please post the image.

10th of April 2005 (Sun)	#8
thomasrhee Member Join Date: Mar 2005 Location: Fort Lee, NJ Posts: 196	Re: Focus Points ! If you want 2 objects in focus which are not on the same plane, you need to increase your DOF by selecting a higher aperture depending on how far apart those 2 objects are. If you're using A-DEP mode, you need to check whether the focus points have latched onto whatever you want to be in focus. I never use this mode since it's more trouble than it's worth and sometimes a hit or miss if you're not careful. IMO, better to use Av mode and select the right aperture setting for the amount of DOF you want. __________________ tyr Canon 20D, Fujifilm F10, Canon 28-70/2.8L, Canon 70-200/4L, Canon 50/1.4, Canon 580EX, Canon 420EX, Canon i9900, Canon iP6700D, Lexar 80X & Sandisk Ultra II CF Cards

10th of April 2005 (Sun)	#10
Marvinspu36 Member Join Date: Feb 2005 Location: California Posts: 228 IMAGE EDITING OK	Re: Focus Points ! Must be a stuttering finger, cause it looks more like f2 at 10 feet for a 50mm. That gives you a little over a foot of DOF, which would be enough to keep the one girl mostly in focus, and everything else out of focus. __________________ Canon 20D with battery grip, EF-S 18-55mm, EF 50mm f/1.8 II, EF 70-200mm f/4L, EF 24-70mm f/2.8L, EF 70-200mm f/2.8L IS, 580EX, 420EX's, Epson P-2000, some umbrellas and other stuff...

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