-= 7D2 owners unite! Discuss and post photos!

Fork-tailed Flycatcher at last light.

IMAGE LINK: https://flic.kr/p/qRtF​N8

IMAGE LINK: https://flic.kr/p/qz5u​uN

Beautiful shots of a stunning bird Kester.

Just an FYI. I know there were some questions in this thread about whether the AF cases are just presets for different shooting situation to make life easier for us or whether they have different AF algorithms. I for one thought that if I adjusted one case to match that of another, the 2 cases would be identical and there were no behind the scenes AF algorithms. However, one poster here stated that they spoke to Canon and was told that there is indeed differences between the Cases, no matter the settings.

The question was asked again on the FM forum, so I looked into the Cases again and noted that Case 5/6 only works with Zone AF, but Cases 1-4 works with all AF points, so I thought maybe there are some differences. Many on FM believes that all AF Cases algorithm are the same and that Canon merely provided different presets (Cases 1-6) to help the photographer. I spoke to Canon CPS tech rep and was told that they are merely presets, but that response was the exact opposite to what the poster here stated that another Canon rep said. So, I posed this question to Rudy Winston (Canon tech who made the Canon 7D2 videos - see link below). Check out his response and tell me what you think.

Thanks...Al

https://www.youtube.co​m/watch?v=u466WL71J1E

Methodical wrote in post #17391967
Just an FYI. I know there were some questions in this thread about whether the AF cases are just presets for different shooting situation to make life easier for us or whether they have different AF algorithms. I for one thought that if I adjusted one case to match that of another, the 2 cases would be identical and there were no behind the scenes AF algorithms. However, one poster here stated that they spoke to Canon and was told that there is indeed differences between the Cases, no matter the settings.

The question was asked again on the FM forum, so I looked into the Cases again and noted that Case 5/6 only works with Zone AF, but Cases 1-4 works with all AF points, so I thought maybe there are some differences. Many on FM believes that all AF Cases algorithm are the same and that Canon merely provided different presets (Cases 1-6) to help the photographer. I spoke to Canon CPS tech rep and was told that they are merely presets, but that response was the exact opposite to what the poster here stated that another Canon rep said. So, I posed this question to Rudy Winston (Canon tech who made the Canon 7D2 videos - see link below). Check out his response and tell me what you think.

Thanks...Al

https://www.youtube.co​m/watch?v=u466WL71J1E

I think this video discussing the cases is better and tries to answer the question. Do two Cases, if setup with same parmeters, behave the same? . . It is loosely implied, but I would feel better if Canon outright answered the question. Controlling AI Servo AF to track your moving subj…: http://youtu.be/7sgRZB​o-WKI

Dallas certainly has a beautiful skyline now and TTUShooter did a wonderful job capturing it in frame.

I'm starting to get comfortable with the 7D2. Getting out there is the reason, along with some suggestions from Jeff (Pondrader). Thank you, Jeff

IMAGE LINK: https://flic.kr/p/qT98​Q6

IMAGE LINK: https://flic.kr/p/qAQW​Te

IMAGE LINK: https://flic.kr/p/qAHN​hj

IMAGE LINK: https://flic.kr/p/pWvX​ar

Methodical wrote in post #17391967
Just an FYI. I know there were some questions in this thread about whether the AF cases are just presets for different shooting situation to make life easier for us or whether they have different AF algorithms. I for one thought that if I adjusted one case to match that of another, the 2 cases would be identical and there were no behind the scenes AF algorithms. However, one poster here stated that they spoke to Canon and was told that there is indeed differences between the Cases, no matter the settings.

The question was asked again on the FM forum, so I looked into the Cases again and noted that Case 5/6 only works with Zone AF, but Cases 1-4 works with all AF points, so I thought maybe there are some differences. Many on FM believes that all AF Cases algorithm are the same and that Canon merely provided different presets (Cases 1-6) to help the photographer. I spoke to Canon CPS tech rep and was told that they are merely presets, but that response was the exact opposite to what the poster here stated that another Canon rep said. So, I posed this question to Rudy Winston (Canon tech who made the Canon 7D2 videos - see link below). Check out his response and tell me what you think.

Thanks...Al

https://www.youtube.co​m/watch?v=u466WL71J1E

I hope he responds to your second question asking for clarification. Let us know if he does.

Doc

McNeese72 wrote in post #17393073
I hope he responds to your second question asking for clarification. Let us know if he does.

Doc

Yeah, me too. They kind of skirted over that in the response.

gschlact wrote in post #17392355
I think this video discussing the cases is better and tries to answer the question. Does two cases setup I've timely behave the same. . It is loosely implied, but I would feel better if Canon outright answered the question. Controlling AI Servo AF to track your moving subj…: http://youtu.be/7sgRZB​o-WKI

I've seen that video and it doesn't specifically answer my question. I want to know if all AF Cases have different AF algorithms, regardless if I set up each Case identically. I should've asked that question in that video. I may move that question over there.

I stand by what I said on FM - the parameters guide the AF system to your desires, but the underlying algorithms are slightly different based on how they track.

This is my opinion based on nothing but use and some common sense of looking at the cases and the fact that they are geared towards 6 different and distinct situations.

huntersdad wrote in post #17394459
I stand by what I said on FM - the parameters guide the AF system to your desires, but the underlying algorithms are slightly different based on how they track.

This is my opinion based on nothing but use and some common sense of looking at the cases and the fact that they are geared towards 6 different and distinct situations.

Canon stated the same.

1st one is the 7DII @ 16,000 ISO, (POTN still only reports 12,800 ISO) it has a fair bit of PP but is also heavily cropped!

IMAGE LINK: https://flic.kr/p/qBxR​up

IMAGE LINK: https://flic.kr/p/qBp8​pu

IMAGE LINK: https://flic.kr/p/qTPy​fk

McNeese72 wrote in post #17393073
I hope he responds to your second question asking for clarification. Let us know if he does.

Doc

Canon responded:

My question:

Just to be clear. If I adjust Case 1 to the same settings as say Case 3 there are still non user modifiable AF algorithm going on behind the scene that makes the two AF cases different no matter the settings? Is this correct?

Canon's response:

"That is correct, there are background settings in each case that cannot be modified. We hope this helps."

So that solves that question. Each AF case is different no matter if we set them all up with the same settings.

Glad to know this for sure now.

Al