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From: Alf92 <alf921@gmail.com>
Newsgroups: fr.rec.photo
Subject: Re: [EC] La sentinelle! et le Syrphe Atterrisseur
Date: Thu, 13 Jun 2024 12:57:06 +0200
Organization: A noiseless patient Spider
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jdanield (le 13/06/2024 � 10:21:38) :
> Le 13/06/2024 � 09:51, Alf92 a �crit�:

>> c'est bien un changement de focale, m�me dans le cas o� on bouge tout
>> le bloc optique.
>
> heu... tu change la focale en d�pla�ant l'objectif?

focale : distance entre le foyer optique et le plan o� se forme 
l'image.https://upload.wikimedia.org/wikipedia/commons/thumb/7/79/Focal-length-a.png/800px-Focal-length-a.png