Philip Bloom with the FS700

chromeboy007 said:
Notice the flickering lights in the last shot at 3:31. I wonder if you can play with the shutter speed in slo mo modes.
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That's a common problem with artificial illumination in high frame rate footage, & I don't believe there's a practical shutter angle solution.

The typical solution is to use a 5k, or larger, tungsten for artificial illumination. Like most artificial sources, smaller tungstens will flicker, but the larger one's filament stays so hot that you won't see the decay caused by the frequency of the electrical current.
 
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As usual, Philip's practical perceptions are right on the mark. More slo-mo but he takes it one step further with the cu frames of smoke and window cleaner and the shot of the stones coming closer to the camera as the girl goes soft was brilliant.

Coming from an AF100, I question whether the FS700 mount can safely support the Canon 100-400 without rails.

Quite a marked difference from the two bimbo's playing with a water hose shown in another post.

Thanks, Philip
 
Bern Caughey said:
That's a common problem with artificial illumination in high frame rate footage, & I don't believe there's a practical shutter angle solution.

The typical solution is to use a 10k, or larger, tungsten for artificial illumination. Like most artificial sources, smaller tungstens will flicker, but the larger one's filament stays so hot that you won't see the decay caused by the frequency of the electrical current.
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Thanks. Has anyone seen any FS700 footage with 100% indoor lighting? I find it hard to believe that professional tungstens would produce flickering - those lamps in this video probably have low frequency or whatever that's causing the flickering.
 
chromeboy007 said:
Thanks. Has anyone seen any FS700 footage with 100% indoor lighting? I find it hard to believe that professional tungstens would produce flickering - those lamps in this video probably have low frequency or whatever that's causing the flickering.
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As far as my experience and knowledge, tungsten lights in general won't cause flickering (at least not at these framerates), but most non-professional other light sources (low-pressure sodium vapor, medal-halide, and flos) will. HMIs running off of magnetic ballasts may cause some problems as well. Kinos and HMIs using flicker-free electric ballasts shouldn't cause any issues at all.
 
  2. "Lighting for High-Speed
    Lighting issues are not specific for the Phantom cameras but for high frame rate photography in general. Even with the great sensitivity of modern cameras, be prepared to use a considerable amount of light. Beyond illumination, the largest issue in high-speed lighting is flicker. Tungsten lights actually have a flicker rate. When powered by alternating current (AC) electricity, the power cycles 50 or 60 times per second (depending on the country and its power system). During the down cycle the tungsten lamp filament can dim slightly, causing flicker. The amount of dimming is related to the type of bulb, wattage and physical size of filament. In general, we have found that lamps larger than 2000 watts use tungsten filaments so large that they do not have time to cool and dim before the power cycles back up. Therefore, we recommend using 2K or greater tungsten light fixtures when shooting above 120fps in 60hz countries and 5K or greater when shooting above 100fps in 50hz countries. Be aware that a unit such as a nine-light is NOT a large fixture but is actually an array of smaller lights and as such can flicker.
    Some additional recommendations are to use DC power for tungsten lights, which eliminates flicker entirely. HMI and fluorescent lights are generally fine for speeds under 120fps as long as they use electronic ballasts. Magnetic ballasts should not be used. HMI lights can suffer from “arc wander,” whereby a plasmatic “hot spot” can move about within the bulb, causing an amorphous shifting movement in the light output. LED lights are subject to the electronic circuits driving them which can create a vast array of refresh rates, but generally we have found that LED fixtures designed for the production community will not flicker as long as they are not dimmed.
    Finally, the shutter angle on the Phantom can affect flicker as well, as a greater shutter angle allows for a longer response time from the light. When shooting extremely high frame rates, it may no longer be necessary to retain a 180-degree shutter to capture the motion generally preferred for a filmic look. A 360-degree shutter allows both more light sensitivity and reduced flicker possibilities."

    http://resources.abelcine.com/2009/06/18/phantom-hd-faqs/

 
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Just wondering, steadycam and highspeed shoot... How the 2 go together?

Which steadycam will works well with the FS700?
Which camera rig will you prefer?

__________________________________________________________
Vincent Thomas
Artist for Film / Photograph & Creative Director
http://www.stranger-than-paradise.book.fr/
_________________________________________
 
snp said:
Coming from an AF100, I question whether the FS700 mount can safely support the Canon 100-400 without rails.
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I was wondering the same thing. Seems to work for Philip but I got a little nervous just looking at that lens hanging out there like that.
 
HI guys

Cheers

Yes the flickering in that shot with artificial light is simply down to shooting high shutter speeds which are needed for high frame rates. I mention this briefly at end of part 1 as it was why I stopped shooting in Brighton. Light flickering was leaking everywhere.

Yep. Had issues keeping PP in memory due to pre production nature so kept resetting to off which is bad so please don't judge highlights or anything image wise too much!

I did shoot mostly slow motion as that's it's main selling point. For me it's not the 4k as we don't know what it's like or how much it will cost you.

Wish ergonomics had been improved but bang for buck its a damn fine camera indeed. Yes we are going to see a lot of overuse of it coming up but that is always the case!

Enjoy what you have. Hoping to get my hands on the BMD camera soon!

PB
 
Philip, Care to speculate why you would get increased (slightly) aliasing on the high frame rate footy? I was under the impression it wrote to a buffer then wrote to the card at normal speed. Shouldn't be any different than normal..... or is there something different going on under the hood?
 
The only thing bothering me a little at this point is the LCD. That's just such a weird placement and such little flexibility in angles. Yes, most everyone will be using a third party monitor, I get that. But still, just a strange design IMO.
 
philip bloom said:
.. For me it's not the 4k as we don't know what it's like or how much it will cost you.
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Yeah, I´m not that much into 4k in the moment ether, Philip, but on the other hand, we already see more detail and sharpness just because of the 11MP sensor sitting there and scaling down to HD.
Sony can use a less strong optical low pass filter because of that. Perfectly fine at normal shooting.
But you can see the downside at SlowMo, where it does ether line skipping or some other Voodoo, to get the framerates out of the sensor and you can see some aliasing and slighty moire coming up.

Frank
 
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