Lightbox – Boite à Lumière maison pour photo commerciale de publicité

Homemade Lightbox

Aujourd’hui, je vous présente ma dernière lubie du moment, une boite à lumière faites maison. J’ai réalisé cette « lightbox » car j’ai mon ami Fred qui est en train de créer son entreprise en ligne de vente de robots personnels nommée Robootic.com et il souhaite que je photographie ses robots pour son catalogue en ligne. J’en profite pour faire sa publicité même si a ce jour, le site officiel n’est pas encore disponible. En attendant, vous pouvez suivre son site d’actualité sur la robotique qui commence à être très connu Robotimpact.com.

RobotIl a donc fallu que je m’équipe car je n’avais pas le matériel nécessaire pour créer des photos commerciales de catalogue. J’entends par la des photos comme le petit robot ci-joint avec un éclairage uniforme sur toutes les faces de l’objet, un arrière plan blanc pur et très peu d’ombres portées.

D’autres photos disponibles dans cet article.

Comme je n’avais pas forcément les moyens d’investir dans du matériel de professionnel, j’ai préféré mettre en pratique le tutorial de ce très bon site StudioLighting.net qui nous explique comment concevoir une boite à lumière pour une centaines d’euros.

Ma boite mesure 100x70x70cm et me permets de prendre des objets mesurant jusqu’à environ 40x40x40cm. Je ne pas prendre des objets beaucoup plus gros car sinon l’effet d’éclairage que fourni la boite ne fonctionne plus.

Matériel nécessaire:
- 5 panneaux blanc de carton mousse de 100×70 cm acheté chez Buro+ pour 5 euros la pièce.
- Un cutter et un ruban adhésif blanc ainsi qu’une règle.
- 4 lampes de bureau à pince (10 Euros pièce chez Leroy Merlin).
- 4 ampoules économiques de 20W équivalent 100W de 6500K (8 Euros pièce).
- 1 multiprise.

J’ai utilisé des ampoules économiques car la puissance maximum des lampes de bureau est de 40W ce qui représente vraiment un faible éclairage, même avec 4 ampoules. Ici, j’obtiens un éclairage équivalent à 400W et qui chauffe peu. Cet éclairage artificielle me permet de réaliser des prises à 1/100s à f5.6 ISO 100 à main levée. De plus, j’ai acheté des ampoules de 6500 Kelvins pour avoir une lumière proche de celle du jour.

Le montage de la boite proposé par le site oblige à avoir la place pour stocker cette boite imposante. J’ai donc modifié quelques détails du montage pour pouvoir facilement démonter et ranger la boite. En gros, j’ai découpé des créneaux dans le panneau du haut pour le clipser et le déclipser à volonté sur les panneaux latéraux eux aussi crénelés. J’ai fixé avec un ruban adhésif les panneaux latéraux au panneau de bas pour pouvoir facilement les rabattre.

A venir, quelques photos prises dans cette boîte.

Boite à lumière maison

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30 comments

  1. très intéressant ton article , j’en ai vu d’autres sur le même sujet, mais l’idée d’utiliser les panneaux est astucieuse et plus simple que le carton. par contre , si tu utilises du ruban adhésif, je te suggère du ruban repositionnable, comme celui que l’on utilises en peinture pour protéger, mais sans doute, c’est celui que tu utilises, une question, cependant : ne voit-on pas la ligne du fond ?
    Véronique

  2. Merci Véronique pour ton commentaire. En fait, ton conseil sur le ruban repositionnable m’aurait été utile car je n’utilise pas ce type de ruban que je connaissais d’ailleurs pas. Du coup, c’est vrai que le pliage de la boite s’en trouve un peu plus difficile. Pour la ligne de fond, cela dépend de l’ouverture utilisée et de la distance de prise de vue. Avec une ouverture de 2.8 avec un 50mm, la ligne de fond disparaît complètement. On peut aussi jouer sur l’angle de la prise de vue pour éviter de voir la ligne. Si l’on souhaite utiliser une profondeur de champ plus importante, on peut effacer la ligne au post traitement. Sinon, il est toujours possible, pour éviter cette ligne, d’utiliser une grande feuille canson blanche ou de couleur à positionner sur les 2 plans de la prise de vue (bas+fond). De cette façon, la courbure de la feuille canson efface la liaison entre les 2 plans.

  3. Très intéressant ce billet, j’en aurai peut être besoin de quelque info de ta part, car peut être il me faudra réaliser la même chose pour un ami aussi qui veut photographier des articles d’artisanat … donc si je me bloque sur quelque chose je te ferai signe ^^

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