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Sébastien TULARD

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Since: Oct 04, 2003
Posts: 1



(Msg. 1) Posted: Sat Oct 04, 2003 12:03 pm
Post subject: super8
Archived from groups: alt>movies>cinematography>super8 (more info?)

Bonjour à tous!
Quelqu'un pourrait il m'éclairer sur la fonction "obturateur variable" sur
une caméra super8! qu'est-ce que cela permet de faire?
Merci d'avance pour vos réponses!!
A bientôt

Hello !!

Somebody could inform me on the function "obturator variable" on a super8
camera! what does that make it possible to make? Thank you in advance for
your answers!! So long

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Teacherjh

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Since: Jun 30, 2003
Posts: 36



(Msg. 2) Posted: Sat Oct 04, 2003 1:15 pm
Post subject: Re: super8 [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)

>>
Somebody could inform me on the function "obturator variable" on a super8
camera!

Quelqu'un pourrait il m'éclairer sur la fonction "obturateur variable" sur
une caméra super8!
<<

Three possiblities:

1: variable filming speed (common)
2: variable lens apeture (very common)
3: variable shutter angle (very interesting)

When the shutter angle is small, the film is exposed for a small percentage of
the time it is in front of the lens. It allows you to open the iris (lens
opening) to reduce depth of field without overexposing. It also reduces motion
blur in an individual frame. When the shutter angle is large, the film is
exposed for a large percentage of the time it is in front of the lens. THe
lens aperture can be reduced, increasing depth of field.

The shutter can't be open 100% of the time, because the film does have to
advance to the next frame. But this allows some control of how much exposure
happens between frames (at a given frame rate)

Jose

==
translation by babelfish.altavista.com/babelfish/tr

Trois possiblities :
1 : vitesse variable de pelliculage
2 (communs) : apeture variable d'objectif (très commun)
3 : angle variable d'obturateur (très intéressant)

Quand l'angle d'obturateur est petit, le film est exposé pour un petit
pourcentage du temps où il est devant l'objectif. Il vous permet d'ouvrir
l'iris (ouverture d'objectif) pour réduire la profondeur du champ sans
overexposing. Il réduit également la tache floue de mouvement dans une armature
individuelle. Quand l'angle d'obturateur est grand, le film est exposé pour un
grand pourcentage du temps où il est devant l'objectif. L'ouverture d'objectif
peut être réduite, profondeur de champ croissante.

L'obturateur ne peut pas être 100% ouvert du temps, parce que le film doit
avancer à la prochaine armature. Mais ceci permet une certaine commande de
combien d'exposition se produit entre les armatures (à un taux donné
d'armature)

Jose


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