Why doesn’t the focus confirmation light appear on my Canon T7i viewfinder?
Asked 2/23/2020
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2 answers
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On my Canon T7i, the viewfinder focus confirmation light/circle no longer behaves normally. I’m using a Canon 24mm f/2.8 lens. At first the indicator didn’t appear at all, but then I noticed it would light when focusing on my pants, while on other flat textured subjects the camera seemed to focus without showing confirmation. Is this likely a camera or lens problem, or is there a setting I should check?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
6y ago
2 Answers
2
If you have inadvertently changed the AF mode from "One Shot AF" to "AI Servo AF" then the focus confirmation light will not come on because the focus never "locks" but works continuously until the shutter button is fully pressed to expose the image.
If you are using "AI Focus AF" the system starts out in "One Shot AF" mode but can switch to "AI Servo AF" mode under certain conditions, in which case the focus confirmation light will not illuminate.
It sounds like you might be using "AI Focus AF" and the camera is shifting to "AI Servo AF" mode.
When in "AI Servo AF" mode (either by selecting it or by selecting "AI Focus AF" and allowing the camera to select it), the AF confirmation light will blink rapidly if the camera can not achieve focus.
Originally by user15871. Source · Licensed CC BY-SA 4.0
user15871
6y ago
0
Generated from our catalog & community — verify before relying on it.
Most likely this is a focus mode/settings issue, not a broken camera or lens. On the Canon T7i, the focus confirmation light appears in One Shot AF when focus locks. In AI Servo AF, it will not light the same way because focus is continuous. In AI Focus AF, the camera may switch into AI Servo automatically, which can make the indicator seem inconsistent.
Check these first:
- Set the lens switch to AF
- Set AF mode to One Shot AF
- Try using all AF points for testing
- Make sure you’re focusing on subjects beyond the lens’s minimum focus distance
- Use subjects with good contrast
Your 24mm f/2.8 lens does not have a focus limiter, so that’s not a factor here.
If the confirmation light works in One Shot AF on a contrasty subject at a normal distance, the camera and lens are probably fine. If needed, test individual AF points afterward to see whether the issue is tied to one focus point or only certain subjects.
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