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Manual Focus techniques?

From Earth , Dec 05, 2003; 05:26 p.m.

Im very slow in manual focusing do i really need to focus precisely when Im at f8 or f11? I mean shud my subject 100% focus or is it ok my subject is only 80%focus at f8-f11 i ask this question because when i push the depth of field preview at f8-f11 my subject becomes sharp when i release the depth of field preview button my subject are not 100% sharp. So i can still get sharp pix when im at f8-f11 when my subject is not 100% focus shown on my viewfinder my lens is 50mm 1.4


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El Fang , Dec 05, 2003; 05:33 p.m.

Personally I think it's ok at 76% focus.

Spencer Hahn , Dec 05, 2003; 05:53 p.m.

Don't you usually ramble in the Canon forum?

If it's in focus when you press the DoF preview button, it'll be in focus. What's your question.

Leslie Cheung , Dec 05, 2003; 05:58 p.m.

i suggest you get focus as much as you can as there is only one plane of precise focus. also it depends on the subject as well. if you are doing street with a 28mm, it is easier to let go than say a portrait shoot with a tele lens focus on the eye

Dominic . , Dec 05, 2003; 07:13 p.m.

It might not be very noticible on 4x6 prints, but once you start enlarging it usually becomes clear that poor focus has been used. I would try and get 90%+ if I were you.

Best wishes,


Todd Peach , Dec 05, 2003; 07:34 p.m.

Not to sound glib, but try focussing faster.

"Creeping" to the best focus can be frustrating, as you have difficulty telling when it's "good enough" or "best".

I have more success by rapidly sawing the focus ring to "past good", then "back".

Mark Jordan , Dec 05, 2003; 08:01 p.m.

I guess it's an approach if the difference meant losing an opportunity for the shot. What do you feel contributes to your slow focusing? I would try to identify those issues and see what can be addressed. A few things that come to mind:
- Focusing screens, are they interchangebable on your particular body...if so, try a different screen
- Diopters, if your an eyeglass wearer
- Switching to faster lenses (2.8 or faster) to give you a brighter focusing image to work with

Jake Tauber , Dec 05, 2003; 09:19 p.m.

I suggest you learn some photography basics. You can preset your focus once you understand how aperture effects it.

Read this: http://www.dpreview.com/learn/Glossary/Optical/Depth_of_field_01.htm

Shawn Rahman , Dec 05, 2003; 09:19 p.m.

When is everyone going to learn that that "From Earth" is not serious about learning about anything?

KL IX , Dec 05, 2003; 09:33 p.m.

Learn the basics... there are plenty of references out there.

With a 50mm/1.4 lens and a subject at 10 ft....,

at 1.4 your DOF is <1 ft; at f11, you've got about 7.5 ft of total DOF to work with.

At least that's how it works with Nikons -- Canon might have its own voodoo so you REALLY SHOULD double check with your buddies at the Canon forum -- yes, I really mean that!!!

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