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Refah Seyed Mahmoud

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About Refah Seyed Mahmoud

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    San Diego
  • Specialties
    Stereo, 3D 360, live action virtual reality

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  1. Hi all, Can you/how do you genlock at higher fps? For example, synchronizing two cameras for high speed stereo. Is there a maximum frame rate that can be genlocked? Thank you. -Refah
  2. So I've dreamed up an effect that I've never seen before and which works in theory, but, of course, the devil is in the details... Imagine a music video: 1. Film the artist performing in regular time, let's say 24fps. 2. Project that 24fps performance at 240 fps onto something moving quickly... dancers, blowing smoke, shattering ice, flowing fabric, etc. 3. Film the interaction of the projection with the objects using a high-speed camera at a matching frame rate of 240fps.. 4. Play back the finished shot at 24fps to produce a mix of realtime footage projected onto slow-motion objects. If you let your imagination run freely for a bit, you can come up with all kinds of interesting "time blended" shots, where cigarette smoke blowing from a model's mouth reveals the singer's face, or where the guitar solo is stretched and wrapped across the slowly turning body of a dancer. The reason I think I can get away without the intermittent mechanism in the projection is that the only shutter that really matters is the one in the high speed camera. Even if the film is moving continuously through the gate at 240fps, a fast enough shutter speed and frame rate in the highspeed camera would eliminate motion blur in the projected image just as it does any other moving object. Synchronizing the camera and the projector would be difficult (maybe even impossible?) but since this would be a very expressive technique anyways, it would be fine to see a bit of the gaps between frames, or even a "film roll" effect as the camera and projector go in and out of phase. A certain amount of trial and error would be in order. Using a strobe in the projector would certainly do much to remove any remaining blur...
  3. From what I understand the main issue is the intermittent mechanism - stopping the film in the gate long enough to project it. For my application I'm fine with a continuous pull through the gate. If I wanted to modify a 16 or 35mm projector, how could I get started? I'd need to project only about 30 seconds worth of footage at a time, albeit at 240+ fps.
  4. I need a system capable of projecting an image at 120fps+. I understand that certain 3D cinema projectors can reach these speeds if you combine the left and right eyes at 60fps each, but afaik these are all oversize units designed to be hard-mounted into a theater. Would I be able to modify a film projector to run at such a speed?
  5. Update for anyone watching this thread: So far the front runner is the Panasonic SD800k. For twice the price ($597) and twice the size (328.8g) of a GoPro Hero you get twice the bitrate (28mb), with 1080p at a true 60fps, 3MOS sensor for better color (or so Panasonic claims), and a f1.5-2.8 lens. The TM900 shares the same lens and all the same internals as the SD800k, but nearly doubles again in price to pay for the following features: - double res onboard monitor (~400k vs ~230k on the SD800) - electronic viewfinder - 32gb internal memory - a function button - a lens control ring - a filter screw - a still camera flash - a mic input jack (3.5mm stereo mini) - a stereo headphone jack - 5.1 sound recording - about 70 grams heavier Since 90% of filming will be done using field monitors (and off-camera sound) I can't justify the extra $251 per unit. As a bonus, the sd800 offers some handy tools such as histogram, peaking, and zebras (though only at 98+). Happy for input/argument, - Refah
  6. Hi all, I'm prepping a documentary shoot for the winter: ice-climbers in Montana's Hyalite canyon. I've got cable rigs, and rods, and gadgets galore but all tricked out for ultralight cameras only. I'm happy with GoPros, but considering the rapid pace of development I thought some homework into the subject of ultralight 1080p cameras might just pay dividends. Distribution is to web. The DSLRs are just a tad on the chunky side for my application. The criteria are as follows: - 1080p - 30fps minimum, 60fps i (or p, good luck!) is a bonus. - Minimum 2.8 lens to match the GoPro's lens. - Field monitor-able via component, hdmi, etc. SD is acceptable. - GREAT COLOR! - Cabled remote control is a bonus. - We're using off-camera audio so audio is not a concern. Does this camera exist? Thank you, - Refah
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