Help with the 420 EX in non-TTL use

Started Apr 15, 2013 | Discussions thread
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Vito_F OP
Regular MemberPosts: 158
Re: Probably won't work.
In reply to Lemming51, Apr 16, 2013

Lemming51 wrote:

BAK wrote:

The 420EX always works in E-TTL.

In order to always work in E-TTL, it always has a preflash.

And I do not know how you set the preflash off BEFORE the shutter opens, and then set the "real" flash off WHEN the shutter opens.

If you had a 430EX, which has a manual switch, you could probably use it.


420EX also works in traditional TTL without pre-flash on older EOS models.  Mounted on non-EOS, it won't receive the communication it expects for E-TTL or TTL and will probably (I could be wrong) simply fire a single flash at full output at shutter open.


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Unapologetic Canon Apologist


Thanks for responding. The flash does fire, and I think you are correct, at full power. If that is the case,  I assume the GN is 138.

thanks, Vito

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