topic Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens in EOS DSLR & Mirrorless Cameras

Canon 90D auto focus setting for Canon 100-400mm IS ii lens

AdoNetok — Sat, 10 Jun 2023 10:47:44 GMT

I just updated lens from Canon 400mm prime to Canon 100-400mm IS ii lens.

I use Canon 90D and AI Servo AF, single point focus.

Using Stabilization mode 3 for Canon 100-400mm IS ii lens.

After a week test, the photos I took are sharper then old lens but still not great.

I want to update customer function settings for auto focus. (C. Fn II).

Can experts help me set up?

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

deebatman316 — Sat, 10 Jun 2023 12:17:29 GMT

What do you want to specifically change. Also what exposure settings are you using. If there too slow it won't help changing custom functions. So please post pictures in the forum.

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

ebiggs1 — Sat, 10 Jun 2023 17:35:11 GMT

"I use Canon 90D and AI Servo AF, single point focus."

What are you shooting that makes you think you need Ai-servo? 90% of the time you don't need it and One Shot will work better and give better results. Try the same shots without using Ai-servo.

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

Waddizzle — Sat, 10 Jun 2023 19:54:20 GMT

" Using Stabilization mode 3 for Canon 100-400mm IS ii lens.. I use Canon 90D and AI Servo AF, single point focus."

How do you know that your settings and technique are not the issue? Are you shooting handheld, or using some type of support like a tripod or monopod? Why are you using Mode 3, instead of Mode 2?

I almost never use a single AF point with AI Servo. If I do, then it is to shoot static scenes and subjects that are not moving. I typically use a single AF point with One Shot AF, or one of the zone AF modes with AI Servo AF.

What settings are you looking to change? Have you taken any test shots with a tripod to get used to how the lens behaves with the AF system in the camera?

What is it about the images that you are seeking to improve? Can you post a sample image WITH exposure settings so that we can better understand your issue?

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

AdoNetok — Sat, 10 Jun 2023 20:36:47 GMT

99% time I shot birds. I will stop ai servo and try single shot.

I want to know what priority for first image and second image. Now I set up all is focus.

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

deebatman316 — Sat, 10 Jun 2023 20:38:38 GMT

Please follow @ebiggs1 advice. Please post pictures too. To see if it's a technique issue or a setting problem.

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

AdoNetok — Sat, 10 Jun 2023 21:04:18 GMT

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

AdoNetok — Sat, 10 Jun 2023 21:56:54 GMT

Canon EOS 90D

ƒ/5.6 1/1000⚫ 371.00mm ISO1600

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

Waddizzle — Sat, 10 Jun 2023 22:44:23 GMT

Has this image been edited? is your image cropped? If so, by how much?

Where is the locked AF point? Either the camera can show you, or the Canon DPP application can show you.

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

ebiggs1 — Sun, 11 Jun 2023 14:53:13 GMT

AdoNetok you need to remember Ai-Servo shoots whether it achieves focus or not. One Shot on the other hand will not fire until focus is achieved and locked. For birds One Shot and just the center focus point which is put precisely on your intended subject will usually yield the best results.

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

AdoNetok — Sun, 11 Jun 2023 15:03:45 GMT

With all of you help, today I use One shot and single point for AF.

It seems to me that photos are better.

Please check the photo was uploaded.

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

AdoNetok — Sun, 11 Jun 2023 15:06:56 GMT

1/1000 at f/7.1, ISO 640, 400 mm

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

ebiggs1 — Sun, 11 Jun 2023 15:55:55 GMT

Looks good my friend! 😁

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

Waddizzle — Sun, 11 Jun 2023 16:30:17 GMT

@ebiggs1 wrote:
AdoNetok you need to remember Ai-Servo shoots whether it achieves focus or not. One Shot on the other hand will not fire until focus is achieved and locked. For birds One Shot and just the center focus point which is put precisely on your intended subject will usually yield the best results.

Sorry, but that is not correct. Beginning with the AF system in the 7D2 you can set the Image Priority for AI Servo mode when using Continuous Drive shooting modes.

You can force the camera to not fire the shutter until it has an AF lock on a subject in AI Servo. There are two settings. One for the first shot in a burst. And one setting for subsequent shots in a burst. They are called 1st Image Priority and 2nd Image Priority.

This may reduce your frame rate slightly or even significantly depending upon your shooting conditions. It is not a bad trade-off, number of keepers vs total number of shots. I’d rather have 5-8 shots per second in focus than 3 to 5 shots out of 10 per second that are in focus.

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

Waddizzle — Sun, 11 Jun 2023 16:41:42 GMT

@AdoNetok wrote:
With all of you help, today I use One shot and single point for AF.
It seems to me that photos are better.
Please check the photo was uploaded.

Nice Shot!

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

ebiggs1 — Sun, 11 Jun 2023 16:52:02 GMT

"Sorry, but that is not correct."

No it isn't. AI-Servo isn’t flawless, if the subject is moving quickly, the focus will lag behind and you’ll end up with slightly out-of-focus images. If the subject moves out from your autofocus point the AF will focus on the background instead. Some people like it. I don't perhaps you do and that's fine. Using One shot you know exactly what is in focus. I consider any Ai-servo mode to be an advanced method and should be tried and experimented with after a full understanding of your camera.

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

Waddizzle — Sun, 11 Jun 2023 17:13:53 GMT

@ebiggs1 wrote:
"Sorry, but that is not correct."
No it isn't. AI-Servo isn’t flawless, if the subject is moving quickly, the focus will lag behind and you’ll end up with slightly out-of-focus images. If the subject moves out from your autofocus point the AF will focus on the background instead. Some people like it. I don't perhaps you do and that's fine. Using One shot you know exactly what is in focus. I consider any Ai-servo mode to be an advanced method and should be tried and experimented with after a full understanding of your camera.

I do not experience the issues that you have described.

Re: Canon 90D auto focus setting for Canon 100-400mm IS ii lens

ebiggs1 — Mon, 12 Jun 2023 14:25:51 GMT

"I do not experience the issues that you have described."

That's great! This mode screws up people more than any.