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Old 4th of February 2006 (Sat)   #1
Paledo
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Default 420 EX flash compatible with the 5D ?

Hi there... I currently have the EOS 30 film and I have been thinking about upgrading to the 5D for a little while now. Could anybody tell me if the 420 E Series flash will work as the main flash on the 5D camera ?
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Old 4th of February 2006 (Sat)   #2
Ronald S. Jr.
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Default Re: 420 EX flash compatible with the 5D ?

Sure will.
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Old 5th of February 2006 (Sun)   #3
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Default Re: 420 EX flash compatible with the 5D ?

It will work as an E-TTL flash but you will lose the advantages of E-TTL II, which is built into the 5D. The 420EX doesn't speak E-TTL II.
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Old 5th of February 2006 (Sun)   #4
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Default Re: 420 EX flash compatible with the 5D ?

Folks, I'm placing the order for 5D tomorrow morning. Currently have the 420EX and thinking to take advantage of TTL II. What would be the advice: 430EX or 580EX?

Thanks.
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Old 6th of February 2006 (Mon)   #5
tiha
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Default Re: 420 EX flash compatible with the 5D ?

E-TTL II is mainly body function. Main advantage is that lens reports distance to body and it can adjust flash output based on that info. To use this feature lens also must support reporting distance (AFAIK all Ring USM lenses). Another improvement is that E-TTL II can use evaluative algorithms. E-TTL II does not require any changes to either the flash units or lenses used with an E-TTL II camera.
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Old 6th of February 2006 (Mon)   #6
Jesper
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Default Re: 420 EX flash compatible with the 5D ?

Quote:
Originally Posted by twalker294
It will work as an E-TTL flash but you will lose the advantages of E-TTL II, which is built into the 5D. The 420EX doesn't speak E-TTL II.
Strange that people keep saying this...

E-TTL II is a function of the camera body, not of the flash. The 5D has E-TTL II and it doesn't matter what Canon EX-series flash unit you use. E-TTL II does work with the 420 EX on the 5D. You do not need the 430 or 580 to have E-TTL II.

To take full advantage of E-TTL II, you do need a lens that transmits focus distance information to the camera - not all lenses do.

See this for more info: Flash Photography with Canon EOS Cameras - E-TTL II.
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Old 6th of February 2006 (Mon)   #7
Tom W
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Default Re: 420 EX flash compatible with the 5D ?

Quote:
Originally Posted by twalker294
It will work as an E-TTL flash but you will lose the advantages of E-TTL II, which is built into the 5D. The 420EX doesn't speak E-TTL II.
That is not quite right - the camera controls the aspect of flash photography that is E-TTL II. The only function that the 420EX is not capable of that was introduced with E-TTL II is the ability to adjust its flash zoom according to the crop factor. But the 5D doesn't have a crop factor so that feature is unnecessary.

See Page 100 of the 5D manual: " The camera can execute E-TTL II autoflash with any EX-series Speedlite".

I think that the confusion on the issue comes from the fact that the 420EX and 550EX manuals don't mention E-TTL II, since they were produced before this version of flash control was introduced.
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Old 6th of February 2006 (Mon)   #8
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Default Re: 420 EX flash compatible with the 5D ?

Quote:
Originally Posted by twalker294
It will work as an E-TTL flash but you will lose the advantages of E-TTL II, which is built into the 5D. The 420EX doesn't speak E-TTL II.
that's funny my Elan 7N reported E-TTL II data just fine with my 420EX, last I recall E-TTL II was a body function more then a flash function. And my Elan reported the 420Ex was an E-TTL II flash. The Elan 7N/NE was the first E-TTL II system if I recall and all the flashes on the market at the time 420-550 worked with ETTL II.
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