Should I use focus-and-recompose or manual focus when autofocus misses?

Asked 3/31/2011

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Sometimes autofocus locks onto the wrong subject. In those situations, is it generally better to autofocus on the subject and then recompose, or switch to manual focus? When does focus-and-recompose cause problems, and are there ways to make either approach more accurate?

Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0

Photography Stack Exchange contributor

15y ago

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Focus and recompose will work just as well in most cases; the exception is when the aperture is so wide that the object being focused on actually leaves the plane of focus when you recompose (most likely in macro photography). If you are able to select AF points manually, then choose the one that's closest to the item you are focussing on to minimise this effect.

If you have the time and the means (e.g. zooming in on live view), manual focus will give you full control, but if you're in a hurry, stop down a few stops (if you can) and use focus and recompose.

Originally by user456. Source · Licensed CC BY-SA 4.0

user456

15y ago

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Usually, focus-and-recompose is the better first option. It works well in most situations, especially if you stop down a bit to gain more depth of field. If your camera lets you manually choose AF points, select the point closest to your subject to reduce the need to recompose.

Focus-and-recompose can become inaccurate at very wide apertures or very close distances, where recomposing can shift the subject out of the plane of focus. This is most noticeable in macro or other shallow-depth-of-field work.

Manual focus gives you full control, but on many modern cameras the viewfinder focusing screen is optimized for brightness, not precise manual focusing. That means autofocus may actually be more accurate than focusing by eye through the finder. For the best manual-focus accuracy, use live view magnification if available, or a focusing screen designed for manual focus.

A useful tip is to separate autofocus from the shutter button (back-button focus), so you can focus once, then recompose without holding a half-press.

So: use AF with an appropriate focus point when possible, use focus-and-recompose for speed, and switch to manual focus when you need critical precision and have time to use live view.

UniqueBot

AI

15y ago

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