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300mm f/4 L IS - focus issue?

Started Aug 2, 2014 | Discussions thread
R2D2 Forum Pro • Posts: 26,551
Re: 300mm f/4 L IS - focus issue?

Earguy wrote:

I recently purchased a 300mm prime, and wonder if I have a focus issue. Attached to a 70D body, back-button focus, I've tried center single point an all the other autofocus settings.

If I'm focused on something relatively close (20 feet), and then try to focus on something farther away (say, 60-100 feet), it simply doesn't focus. It might search once, never come close, and stops. The same thing happens going from distant to close. Smaller increments of distance, it's dead on accurate. If I turn the manual-focus ring to bring the object even into the neighborhood of focus, it focuses fine.

Is this normal behavior for this lens, or do I have a problem?

Go into the menu and turn "Focus Search" ON. (I usually keep it OFF BTW).

Hope this helps.

R2

ps. nice hummer

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