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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 14 Sep 2011 (Wednesday) 22:25
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Manual flash in Av or P

 
gtrag94
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Sep 14, 2011 22:25 |  #1

I was testing my 580EX that I just got back from Canon today and it seemed weird. I sent it in because it would only fire at full power in Manual flash mode (Av on camera). Don't ask "how do you know... etc." It did, I know. They fixed it and replaced some other things on it and now it works. I did have a question though about how manual flash works on the camera because it was acting weird (my other 580EX was doing the same thing, so I'm guessing it's correct, I just don't understand WHY it was doing it...).

30D, 50mm 1.8, 580EX on camera
Metered the dining room without flash in Av mode... 1/25, f/1.8, ISO 100
Turn the flash on, set to Manual flash, 1/128th power... and it changed the shutter speed to 1/250th (x-sync). It didn't matter what the ISO was or what the f-stop was... always 1/250th.

Then I tried setting it to Program and still Manual flash, 1/128th power. Now pointing it at the same thing in the dining room it was saying 1/250th, f/22 blinking. Definitely not right.

Like I said before, both of my 580EXs were doing this so it must be normal, or something wrong with the camera (I'll try my other 30D tomorrow). What do you think?


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windpig
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Sep 14, 2011 22:43 |  #2

How does it function with the camera in full manual mode?


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Albert ­ Nam
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Sep 14, 2011 22:45 |  #3

Edit: Oh sorry. I'm an idiot. It's late for me :P


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krb
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Sep 14, 2011 22:47 |  #4

gtrag94 wrote in post #13105391 (external link)
It didn't matter what the ISO was or what the f-stop was... always 1/250th.

There's a menu option that tells the camera to lock shutter at 1/250 when it detects that a flash is attached, but I think it only applies to Av.


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gtrag94
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Sep 14, 2011 22:50 |  #5

Yeah, I know about that custom function, it's set to Auto.. and you're right, only Av, not P.

Don't know about M on the camera, didn't try it. I'll let you know tomorrow. Any other ideas?


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windpig
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Sep 14, 2011 22:53 |  #6

I always use manual mode, and for sure start with the lowest denominator when trying to figure out an issue (try manual and add things from there).


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gtrag94
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Sep 14, 2011 22:55 |  #7

I should have tried that, but I wasn't sure what it "should" show up as... still ambient readings right?


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Curtis ­ N
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Sep 14, 2011 23:56 |  #8

It's called Flash Sync Speed in Av Mode.
C.Fn. 03-1 on the 30D.
But I don't think that's your problem.

It's a "feature" of the way Canon designed things. With a dedicated flash in manual mode and the camera in one of the auto modes, it does really stupid things. Just switch to M and be done with it.


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Sep 15, 2011 12:13 |  #9

As for behavior of camera in P, flash on M, I just experimented with my 40D...

  • Ambient light and no flash turned on, camera in P, ISO 100: 1/20 f/2.8
  • Flash on ETTL, camera in P, ISO 100: 1/60 f/4.5
  • Flash on M full power, camera in P, ISO 100: 1/60 f/4.5
  • Flash on M 1/128 power, camera in P, ISO 100: 1/60 f/4.5

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Curtis ­ N
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Sep 15, 2011 14:51 |  #10

It's been a while since I tested this, but from what I recall, P mode is not so problematic. Av and Tv modes are.


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Wilt
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Sep 15, 2011 19:42 |  #11

Curtis N wrote in post #13108895 (external link)
It's been a while since I tested this, but from what I recall, P mode is not so problematic. Av and Tv modes are.

OP commented on the P mode..."Then I tried setting it to Program and still Manual flash, 1/128th power. Now pointing it at the same thing in the dining room it was saying 1/250th, f/22 blinking. Definitely not right."

I countered with what seems to make P mode seem reasonable in its actions with flash: the same in ETTL and M/1 and M/128


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Sep 16, 2011 12:40 |  #12

gtrag94 wrote in post #13105391 (external link)
Then I tried setting it to Program and still Manual flash, 1/128th power. Now pointing it at the same thing in the dining room it was saying 1/250th, f/22 blinking. Definitely not right.

What do you think?

I think your camera is busted. If your camera is in P and ISO 100, 1/250, f/22, means it thinks it is metering a VERY bright scene. Even if a flash is attached, or if it is in manual flash mode, it should not meter like that indoors.


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Manual flash in Av or P
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