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PostPosted: Mon Oct 24, 2011 3:35 pm 
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Location: Slovakia
Hello there, sometimes when i used to shooting with aperture priority or P mode with my 60D and 430exII flash, the time has gone too long (over a second) so as a result there was blurred image.
Was i doing something wrong? Sometimes it makes ok photo, sometimes it chooses long exposure time.

I cant correct it better than using time priority, and set time and iso manually so it will calculate f number. For flash metering, i use TTL.

Or Av just isnt for shooting with flash?

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PostPosted: Mon Oct 24, 2011 3:47 pm 
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Hi there,

let me get this straight.
When you shoot in A mode the camera calculates the exposure time. An in your case the camera calculates a longer exposure time than needed with a flash?

I had this problem also and Citruspers helped me out.

To quote him: "Do you have it set to slow sync or rear curtain sync flash?"

Because that was the case with me, I had it set to rear curtain.

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PostPosted: Mon Oct 24, 2011 4:05 pm 
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Location: Slovakia
well i have currently set it in first shutter sync, but sometimes i have hi speed sync on camera.


i tried it now, with and without flash, with P mode its ok, with Av mode again longer time! With Extarnal flash 4 seconds, with internal 2.5 seconds...

hi speed sync made no difference. tilting head straight or bouncing made no difference.

what is a slow sync?

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I'm new to DSLR's, so please be patient and take my opinions with reserve. Thank you : ) Yes, i am Canon man.
Image Google + Image My picasa photos Image My 500px album
Canon 60D + 15-85mm f3.5-5.6 IS, Canon 70-200 F2.8L IS II, Canon 430EXII, polarizing filter 72mm,
Canon AT-1, 50mm FD F1.8
Canon A430,


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PostPosted: Mon Oct 24, 2011 4:41 pm 
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That is normal for the default settings on Canon, even if it doesn't seem intuitive at first.

In Av mode, the camera exposes for the background then applies fill flash for the foreground subject, with the idea that both will be correctly exposed. Of course, if the background is dim, that could be a long exposure.

If you don't want this behaviour, you can override it in the custom functions so it always uses a shorter shutter time with flash in Av mode.

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PostPosted: Mon Oct 24, 2011 11:19 pm 
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It's a typical problem. If that annoys me (as it sometime does), I just use the manual mode and select the shutter speed I want.

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PostPosted: Mon Oct 24, 2011 11:29 pm 
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Location: St. John's, NL, Canada
Some cameras (I can't speak for yours) have a function that you can set the slowest shutter speed when using a flash. Alternatively, you can use manuel mode when using a flash - which is what I primarily do anyway.

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PostPosted: Tue Oct 25, 2011 3:35 am 
Just been reading Sly Arena's Speedlighting Handbook and key thing that comes from it is

Shutter speed exposes the background, aperture exposes the flash.

When using E-TTL the camera is helping make these choices.

What effect you are after all depends what it is your shooting. E.g. a landscape shot will require a different approach to an action shot and a different approach to a portrait.

Also worth remembering that while the shutter may be open for a second the flash burst only lasts less than 1/800th of a second so will freeze foreground motion. The background will be blurred though if the camera isnt on a tripod.

This may seem confusing at first but its worth getting to grips with as it forms the basis of using flash and at the very least you'll understand what it is your camera is trying to do


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PostPosted: Tue Oct 25, 2011 5:05 am 
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I don't know how it is on your 60D, but on my 50D if you set a minimum shutter speed to prevent these long exposures, it will also set a maximum shutter speed equal to the sync speed (shutter speed between 1/60th and 1/250th, or something). That means even if you put on an external flash in high-speed sync mode, you cannot go over 1/250th. This happened to me and it took a while to figure out!
Imo the best way is to go full manual on the ambient exposure

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PostPosted: Tue Oct 25, 2011 7:02 pm 
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Location: Slovakia
Thank you all, it seems its a common problem.

I'm not used yet to manual, but of cource its a god idea because when i am shooting with flash tle lighting conditions doesnt change so much.

If shooting in complete darkness, the shutter speed doesnt matter, but i often shoot in low light conditions (and nifty fifty is not an answer).

i will try to look for that max shutter speed locking function, but it seems time priority will be my ultimate solution.

_________________
I'm new to DSLR's, so please be patient and take my opinions with reserve. Thank you : ) Yes, i am Canon man.
Image Google + Image My picasa photos Image My 500px album
Canon 60D + 15-85mm f3.5-5.6 IS, Canon 70-200 F2.8L IS II, Canon 430EXII, polarizing filter 72mm,
Canon AT-1, 50mm FD F1.8
Canon A430,


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