Questions tagged [focus-assist]

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2
votes
1answer
70 views

Does near infrared AF assist light work with sensor based autofocus?

Some flashes, cameras and wireless flash triggers (like Canon ST-E2) have a near infrared AF assist light that is invisible to the human eye. My understanding is that his AF assist light works at ...
8
votes
2answers
716 views

What is the red grid pattern appearing in the video?

While watching a talk on youtube, I noticed a strange grid-like led-like pattern a few times during the talk. An example: https://youtu.be/Toluc5MCQWs?t=868 I'm not sure what that is, but I thought ...
1
vote
1answer
298 views

Why does focus- assist light on speedlite fire when main flash fires?

Using a new Gloxy 990 on a Canon 80D hot shoe, the bright red light of the Gloxy Focus Assist is appearing on the image at a wide range of setting. The light works at half press - but must be firing ...
3
votes
2answers
2k views

YN685 AF assist not aligned with focus points — can anything be done?

I just got a Yn685 hoping to be able to focus better in low light. However, the red grid that is projected is WAY out of alignment with my focus points (Canon 6D). Is there anything that can be done ...
6
votes
3answers
8k views

Why isn't infrared AF assist beam the default when available (instead of irritating strobing)?

I have an entry level Canon camera with a built-in flash. When I try to photograph people at night the camera fires some pre-flashes to help with focus. While I do understand its necessity, some of ...
0
votes
1answer
572 views

Can I use the internal autofocus (AF) beam with an external flash on a Canon 600D?

If we are using an external third-party flash with no auto focus beam support, is there a setting to use the built-in auto focus beam with an external flash? I'm using a Canon EOS 600D.
1
vote
1answer
6k views

How do I set the manual focus magnification on the Sony NEX-5R?

The NEX-5R has a manual assist function: if you enable it, and put the camera in manual focus mode, then when you rotate the focus ring, the camera shows a magnified view so that you can focus better. ...
0
votes
1answer
181 views

Why does the focus light come on in manual focus mode?

When I'm in the manual focus mode, I find that the focus light (the red blinking light) sometimes still comes on before it takes a photo. Why is this? I thought the purpose of the light is to ...
0
votes
1answer
1k views

Nikon D3200 with IR remote control uses AF-Light although turned off

I have big issue on my Nikon D3200: If I use an IR remote control, the AF-Assist Light always flashes, after taking a photo, although I explicitly disabled it in the menu! How can I disable it ...
1
vote
2answers
314 views

Why Focus Assist activating in full outdoor light on my Canon EOS Rebel?

Trying to understand why the focus assist feature is activating in full outdoor light on a sunny day. I have a Canon EOS Rebel T-3. Recently, the 18-55 stock lens was replaced free by Canon. Since I ...
1
vote
2answers
460 views

What color are actual LEDs used in the 430EXii Speedlite's AF-assist?

I've discovered consistent focus problems using Rebel XSi + 430EXii + Tamron 28-75. I confirmed this is a common problem which occurs when the Speedlite's AF-Assist is enabled. Some have suggested ...
5
votes
2answers
5k views

Why does the IR-Assist beam of Canon Speedlites not get used in AI Servo AF mode?

The IR AF-assist beam on the Canon Speedlites (I have a 430 EX II) doesn't seem to come on when the DSLR (I have the EOS 7D) is in 'AI Servo' AF-mode. It works fine if I'm in one-shot mode (comes on ...
1
vote
4answers
198 views

How long can an AF Assist LED last?

Many compact cameras and DSLRs have built-in AF Assist LEDs. How do I know how long the LED in the camera will last? (That is, how many more beams before the LED requires replacement?) I notice ...
2
votes
1answer
4k views

Why won't my Canon Speedlite 430EX II AF Assist come on?

I just purchased the Canon Speedlite 430EX II and for the life of me I can't get the AF Assist light to come on! I shoot in manual on my 5D Mark II, and I have set the flash on ETTL. The guide says ...
4
votes
2answers
319 views

How to use in-camera AF light, instead of speedlight AF light?

I have a Nikon D3100 and a Yongnuo YN467 speedlight. What I need is to use thee AF light from the camera body, since I realize it is really better than the speedlight one. Is there any way to achieve ...
7
votes
3answers
12k views

Why does my Nikon D5000's AF Assist only turn on in some automatic modes?

I am using a Nikon D5000 with a 50mm f/1.4 with autofocus. When I try to use manual mode (or aperture priority, or shutter priority), my AF assist beam does not light, which makes it hard for my ...
5
votes
8answers
19k views

How can I focus in very low light with my Canon 60D?

I'm using a Canon 60D and would like to focus in low light. I know Canons — in fact, all cameras — can struggle here with auto focus, but I'm talking about light so low that I wouldn't be able to see ...
3
votes
1answer
825 views

Why doesn't the focus assist light get triggered on a flash connected via a Pocket Wizard TT1?

I have a Pocket Wizard TT1 and TT5 which work fine. I mount the TT1 on the camera shoe and the TT5 fires my remote flash ETTL fine. I now want a focus assist light, so I set a flash (580, 430 or ST-...