EOS: Flas 380 EX/420 EX - Zoom position

[Ria en Rinus de Vos]

I am considering to buy a CAnon Speedlite 380 EX or 420 EX to be used with
my EOS300 with Sigma 28-105 mm 1:3,8-5,6 UCIII and Sigma 105mm MACRO 1:2,8.

Does the automatic zoom positioning of these two speedlites function with
these Sigma lenses

Rinus de Vos

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