Low Lights + AI Servo, how?

[Guy Davis]

Kevin,

I just tried "f" below on my 10D and exposure is determined at full shutter press in One Shot mode.

In the process of testing this feature on my camera I think I found a bug in the Custom Function setting for CF4 version 1.0.1. I'll start another thread to discuss that.

Here's a summary (I think) of what's been discussed:

Method/Exposure determined/Focus determined
---------------------------------------------------------------------
a) CF4-0 with AI Servo/at full shutter press/at half shutter press
b) CF4-1 with AI Servo/at half shutter press/while ' ' is pressed
and held
c) CF4-3 with AI Servo/at full shutter press/while ' ' is pressed
and held
d) CF4-0 with One Shot/at full shutter press/at half shutter press
e) CF4-1 with One Shot/at half shutter press/when ' ' is pressed
and released
f) CF4-3 with One Shot/at full shutter press/when ' ' is pressed
and released

Advantages:
a) Does not require a thumb (good for dogs with 10D). Don't have to
know where the "menu" button is.
b) Allows for recomposition of image after having locked metering
on a specific point. Can focus using recomposed image.
c) Allows independent control of focus
d) same as "a"
e) same as "b"
f) same as "c"

Feel free to suggest other advantages for each method and point out
any corrections that should be made to the Method table.

This looks to be about right! I think it is also important to note
that AE operates the same with AI Focus as it does with One Shot
(at least I'm pretty sure).

What I am not sure about, is Item f . Have you tried this to
verify that no matter the AF mode, AE occurs with a full press?
Could you let us know?

Thanks,

--
Kevin V

One of the greatest things I have ever learned is to:

RTFM

http://www.pbase.com/kevinv

 

[Kevin Vian]

Kevin,
I just tried "f" below on my 10D and exposure is determined at full
shutter press in One Shot mode.

Thanks, this is very good to know. Opens up some more posiibilities with using the 10D.

In the process of testing this feature on my camera I think I found
a bug in the Custom Function setting for CF4 version 1.0.1. I'll
start another thread to discuss that.

A lot of us here have been searching for that bug, with little or no luck! This thread here has turned out to very productive.

Thank you 99V6Coupe for getting it started, albiet it has strayed some from your original topic.

--
Kevin V

One of the greatest things I have ever learned is to:

RTFM

http://www.pbase.com/kevinv

 

[Kevin Vian]

Here is the link to the thread with Chuck initial repsonse, however, the thread goes on.

http://www.robgalbraith.com/ubbthreads/showflat.php?Cat=&Number=186563&page=0&view=collapsed&sb=5&o=&fpart=1

--
Kevin V

One of the greatest things I have ever learned is to:

RTFM

http://www.pbase.com/kevinv

 

[Kevin Vian]

Through a discussion I had with Chuck Westfall of Canon USA (link provided in above post), I am able to provide the following 'concrete' summay and conclusion.

1. With CF4-1, AE LOCK occurs with a half-press of the shutter release regardless of the AF MODE selected (in Creative Zone AE modes).

2. With CF4-3, AE (NO LOCK) occurs with a full-press of the shutter release immediately before the shot is taken, regardless of the AF MODE selected (in Creative Zone AE modes). It is safe to say NOTHING occurs with a half-press of the shutter release.

This thread has been very informative; thanks to all who contributed.

--
Kevin V

One of the greatest things I have ever learned is to:

RTFM

http://www.pbase.com/kevinv

 

[Olga Johnson]

..if you want. But I do know what I'm saying.

I would say that the AF is lock at the RELEASE of the * button, not
at the HITTING of the * button.

In one shot mode, the release of the * button does nothing. You can hit the * key and obtain AF, but the AF will not change if you keep holding down the * key, recompose and release the focus elsewhere. The focus is locked (you hear the focus confirmation sound and the focus point turns red) at the time of the hit of the * key.

Really, though, I say that AF is activated by pressing , and
deactivated by releasing . In AI-Servo, there really isn't a
thing as AF-lock. You're just turning it on and turning it off.

But as long as one knows what it does, I guess that's all that
matters.

Right!

Olga

 

[Jack DuMoulin]

This is correct for single shot mode Olga. In A1 Servo, however, the AF will remain active a long as your thumb is on the * button and will only lock in when you release it. Perhaps this is what David was referring to.

Jack

I would say that the AF is lock at the RELEASE of the * button, not
at the HITTING of the * button.

In one shot mode, the release of the * button does nothing. You can
hit the * key and obtain AF, but the AF will not change if you keep
holding down the * key, recompose and release the focus elsewhere.
The focus is locked (you hear the focus confirmation sound and
the focus point turns red) at the time of the hit of the * key.

Really, though, I say that AF is activated by pressing , and
deactivated by releasing . In AI-Servo, there really isn't a
thing as AF-lock. You're just turning it on and turning it off.

But as long as one knows what it does, I guess that's all that
matters.

Right!

Olga

 

[Ben Strasser]

Olga, Is it posible there is a difference between CFn-4 on the 10D and the 1D? I cannot duplicate what David is talking about with the * button. I tend to use CFn-4 = 0 because in Servo mode, as long as I have the shutter half depressed, the camera continues to focus until I take the shot. In One Shot, the half press locks the focus and you need to half press again to change the focus. I find using the * button more useful for FEL and AE Lock. Why start and stop Servo focus when all you have to do is half press the shutter again in the event someone passes your field of view?
Am I missing something here?

I would say that the AF is lock at the RELEASE of the * button, not
at the HITTING of the * button.

In one shot mode, the release of the * button does nothing. You can
hit the * key and obtain AF, but the AF will not change if you keep
holding down the * key, recompose and release the focus elsewhere.
The focus is locked (you hear the focus confirmation sound and
the focus point turns red) at the time of the hit of the * key.

Really, though, I say that AF is activated by pressing , and
deactivated by releasing . In AI-Servo, there really isn't a
thing as AF-lock. You're just turning it on and turning it off.

But as long as one knows what it does, I guess that's all that
matters.

Right!

Olga

 

[DavidP #28649]

I use CF4-1 in order to separate AF-lock from AE-lock.

Note that on the 1D, there's a separate button for FEL.

Olga, Is it posible there is a difference between CFn-4 on the 10D
and the 1D? I cannot duplicate what David is talking about with
the * button. I tend to use CFn-4 = 0 because in Servo mode, as
long as I have the shutter half depressed, the camera continues to
focus until I take the shot. In One Shot, the half press locks the
focus and you need to half press again to change the focus. I find
using the * button more useful for FEL and AE Lock. Why start and
stop Servo focus when all you have to do is half press the shutter
again in the event someone passes your field of view?
Am I missing something here?

--
http://www.outboundmusic.com
Your link to independent music!

 

[Ben Strasser]

That makes sense (kind of), the 10D has a CFn-13-4 that provides another button, other than the * button for FEL. CFn-4-0 allows AE-lock with pressing the * button and AF-lock with half press of the shutter button in One-Shot mode and continous AF in Servo mode. If the * button is not depressed, AE and AF lock take place at full shutter button depression in Servo mode. Given that operation, isn't that what you are doing with the CF4-1 on your 1D? Is it not the same as hitting the * button for AE lock and half depressing the shutter for AF lock? Basically, you are using CF4-1 to switch you in and out of Servo and One-Shot mode, something like a manual AI Focus mode.

Note that on the 1D, there's a separate button for FEL.

Olga, Is it posible there is a difference between CFn-4 on the 10D
and the 1D? I cannot duplicate what David is talking about with
the * button. I tend to use CFn-4 = 0 because in Servo mode, as
long as I have the shutter half depressed, the camera continues to
focus until I take the shot. In One Shot, the half press locks the
focus and you need to half press again to change the focus. I find
using the * button more useful for FEL and AE Lock. Why start and
stop Servo focus when all you have to do is half press the shutter
again in the event someone passes your field of view?
Am I missing something here?

--
http://www.outboundmusic.com
Your link to independent music!

 

[DavidP #28649]

The way I'm doing it, there isn't any One-Shot at all. It's always AI-Servo.

Because of that, you can never get AF-assist from a flash, and you'll never get a "beep" to confirm AF-lock (since there never is a lock).

You will still get a green light to indicate that the AF thinks the subject is in focus, and the green light will flash if it's not good focus (or at least thinks that).

Of course, all that changes if I switch to One-Shot Focus mode.

Basically, you are using CF4-1 to switch
you in and out of Servo and One-Shot mode, something like a manual
AI Focus mode.

--
http://www.outboundmusic.com
Your link to independent music!