430ex ii and 5dmk1 compatability?

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Kermers

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Dave
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Help please, this is a bit of an odd one!

My assistant photographer is using a 5D mk1 with a 430exii speedlite and a 24-105 f4 l is.
When shooting in av mode at f4 with the flash on ettl, the on camera info is recording various apertures.
Google has nothing. I'm hoping someone here has come across this before.


Thanks in advance.
 
Kermers said:
When shooting in av mode at f4 with the flash on ettl, the on camera info is recording various apertures.
Click to expand...

Is the camera actually shooting at various apertures? (In other words, you select f/4 but you don't actually get f/4?) Or is it shooting at f/4 but displaying something different? What does the EXIF data say?
 
That's right. We selected f/4, took shots with varying light levels and the data shows f/5.6, f/8, etc. very odd!
Got to be something simple, just can't figure it out.
 
Kermers said:
We selected f/4, took shots with varying light levels and the data shows f/5.6, f/8, etc
Click to expand...
But were the photos actually taken at f/5.6, f/8 etc? Or is it just the EXIF data which is wrong?

Can you post a couple of examples with EXIF intact?
 
StewartR said:
But were the photos actually taken at f/5.6, f/8 etc? Or is it just the EXIF data which is wrong?

Can you post a couple of examples with EXIF intact?
Click to expand...

I'm trying to help you here.....
 
Sorry Stewart. Been rushed off my feet past couple of days.
I appreciate your help. I will try and get some images off him to show you what's happening ASAP.
Have you come across anything like it before?
 
Hi Stuart,

If you havent got fed up with these delays, here is one of the images he took, with this strange issue.
Below are the details he sent me, I think it explains the problem better than I did.

"camera is set to f4 (AV), without flash switched on, all pictures are shot at f 4
turn flash on and f stop changes depending on lighting conditions."

9401733613


Hope this works btw. not added an image before.

Thank You

Dave.
 
Last edited:
OK, got it.

What you're seeing is perfectly normal behaviour which can be easily reproduced using any Canon DSLR and any Canon flash.

The camera is set to ISO 1600, and f/4 in AV mode. But it's quite a bright scene, so the camera calculates the required shutter speed to be something like 1/400th. That's faster than the camera's flash sync speed. The camera assumes that you care more about using the fill-in flash than you do about using that particular aperture, so it closes down the aperture a bit, to f/5.6. That slows down the shutter to 1/200th, at which speed flash sync is possible.

If the scene were brighter, the originally calculated shutter speed would be faster than 1/400th and the camera would have to stop down the aperture beyond f/5.6 to achieve flash sync.

Got it?
 
Cheers Stuart! You're a star! We usually shoot in manual, but due to the light changing so much AV came into action. The flash sync speed explains it all. Makes sense now. I'll put his mind at rest. Thanks again for your time on this. I really appreciate it.

Kind regards
Dave.
 
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