Travailler avec des filtres à prisme fractal

Lors d’une récente sortie, j’ai aperçu un ami plaçant ces étranges morceaux de verre devant son appareil photo alors qu’il photographiait des papillons. Toujours curieux, je lui ai demandé ce qu’ils étaient, ce qu’ils faisaient et comment les utiliser. J’ai rapidement été initié au monde des filtres à prisme fractal.

J’ai été étonné des résultats, certes, je n’ai joué qu’avec deux des trois qu’il avait dans son kit, mais je suis immédiatement tombé amoureux de ces petits filtres sympas. En les tenant à la main, j’ai découvert que je pouvais manœuvrer le filtre devant l’objectif, mais que vous pouviez placer un connecteur sur votre appareil photo et maintenir le filtre devant l’objectif.

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Qu’y a-t-il dans le kit ?

Le kit est livré avec trois filtres différents, chacun unique dans sa conception, il y a un filtre Penrose, un filtre Pascal, le filtre Julia (mon préféré) et un étui de transport pour environ 99 $. Ces trois filtres très différents sont parfaits pour créer des effets de flou, de bokeh et de prisme. Vous pouvez les placer directement devant l’objectif (le plus près sera le mieux) ou les déplacer pendant la prise de vue. Ils mesurent 100 mm de diamètre – 7 mm est l’anneau profilé chromé, qui ajoute également de la lumière réfléchie et du bokeh.

Éléments techniques

Apparemment, vous obtiendrez des résultats optimaux avec une distance focale supérieure à 40 mm et une ouverture de f/5,6 ou plus large (j’utilisais un objectif de 50 mm et j’utilisais f/3,2), cela ne réduit pas du tout l’apport de lumière. Ils pèsent entre 20 et 100 g et ont un indice de réfraction de 1,6.

« Alors, qu’est-ce qui rend les prismes si spéciaux ? Eh bien, les prismes sont uniquement capables de plier la lumière, les éblouissements et les reflets. avant ils entrent dans l’objectif d’un appareil photo. Prisming ne nécessite ni Photoshop ni post-édition, et crée souvent des résultats plus naturels et plus impressionnants que leurs homologues photo-manipulés. – Fractales

En les plaçant directement devant l’objectif, ils s’appuient sur les mêmes propriétés physiques pour manipuler la lumière que votre objectif. Ils sont tous deux uniquement en verre, en utilisant les filtres comme extension de votre objectif, vous pouvez obtenir d’excellents résultats créatifs.

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Maintenant, je sais que ceux-ci ne sont pas du goût de tout le monde, et même un peu en dehors de ma timonerie macro habituelle, mais je peux vraiment voir certains aspects créatifs de ces filtres et j’ai acheté mon propre ensemble. J’ai hâte de les essayer sur divers sujets, de la nature morte aux portraits créatifs. Le plaisir est de TOUJOURS apprendre quelque chose de nouveau.