fansa84fe8a4
lvl.4
United States
Offline
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Update note for me or anyone building this thing:
One needs to assign the frequencies of the flash trigger different than that of the drone. The frequency of the channels between the Paul Buff CyberCommander I use are different than the channel number frequencies as used by DJI. I had the CyberCommander set to Channel 13, and the P4 set to Channel 19 which happen to be the exact same 2.451 GHz frequency so the flash refused to trigger as the RC was more powerful and on the same frequency. The CyberCommander has a readout of the frequencies for each channel, and the DJI frequencies were posted here prior. Here's the channel frequencies between the two:
Paul Buff CyberCommander channel, followed by Frequency (GHz):
1, 2.427
2, 2.429
3, 2.431
4, 2.433
5, 2.435
6, 2.437
7, 2.439
8, 2.441
9, 2.443
10, 2.445
11, 2.447
12, 2.449
13, 2.451
14, 2.453
15, 2.455
16, 2.457
DJI Phantom P4 channel, followed by Lower, Center, and Upper Frequency band (GHz):
13, 2.381, 2.391, 2.396
14, 2.391, 2.401, 2.406
15, 2.401, 2.411, 2.416
16, 2.411, 2.421, 2.426
17, 2.421, 2.431, 2.436
18, 2.431, 2.441, 2.446
19, 2.441, 2.451, 2.456
20, 2.451, 2.461, 2.466
I used two of their old Ultra 1800 heads and they gave me f/16 with ISO 100 and a ND-64 filter to get the shutter down to 1/10 second to sync with the slow rolling shutter of the P4 at 16 feet which is enough to provide a 1:2 fill. I then tried a small white shoot-through umbrella with the pair and came up with f/16 at 13 feet. I'm guessing using one of their newer 3200 heads may surpass the pair of Ultra 1800's I used. Also, the long throw reflectors they sell may move the units back to maybe 25-30 feet for f/16. The two flash heads are powered by the one Buff Vagabond-Mini power supply and trigger is Siamesed to both heads to fire in unison.
You can see the fill and the larger flash catch-light in the mannequin head's glasses. I added the shoot-through umbrella to soften the light a bit and you can see that effect based on the brown hat's shadow on the gray card on the ground as it has less of a sharp edge than without the umbrella and direct light with just the reflector.
I included a shot of the dual flash heads in operation too.
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Flash on.
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Flash off.
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Setup with flash on.
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Setup with flash off.
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