2009Forum Cameras (Film/Video/HD)
Sélection d'équipements d'éclairage pour l'enregistrement vidéo à grande vitesse à des taux d'images de 500 à 10000 fps
Il y a 17 ans. Le matériel et les prix ont peut-être changé depuis.
Ce que le fil a révélé
- Les lampes HMI commercialisées comme sans clignotants peuvent encore présenter des variations d'intensité et de couleur causées par la rotation de l'arc plasmatique ou le wobbling à l'intérieur de l'ampoule, indépendamment de la stabilité de ballast électronique.
- A K5600 Joker 800 watts HMI n'a pas montré de scintillement notable lors de l'essai à 6200 fps.
- Bulb age and condition significantly affect flicker performance, and replacing a faulty bulb can eliminate flicker issues that persist across multiple shoots.
- HMI lamps smaller than 4 kilowatts tend to introduce flicker more readily than larger lamps, though very small lamps with concentrated plasma arcs like the Joker 800 may perform well.
- Larger HMI bulbs carry a paradoxical drawback: increased gas volume raises the likelihood of plasma disturbances that cause visible flicker.
- Tungsten lighting can serve as a reliable alternative when authentic flicker-free HMI equipment is unavailable, though it requires wider aperture settings due to lower light output.
- Dedicated high-speed cinematography lighting heads like those from Dedolight provide concentrated illumination with minimal heat generation.
- Individual fixture performance varies significantly even among identical models, making testing with the actual equipment planned for production essential.
Dépend de
- Testing of the K5600 Joker 800 was limited to a single frame rate and did not include comparative tests across multiple frame rates.
- Experience with tungsten alternatives was documented only in a specific geographic region and may reflect local equipment availability rather than universal performance characteristics.
- The claim about plasma wobbling in HMI bulbs was not experimentally verified in the thread.
- One participant's reference to an undisclosed high-speed camera model limits the applicability of that experience to unknown equipment specifications.
- No detailed technical specifications were provided regarding ballast frequencies or their relationship to flicker-free performance.