I did a non scientific test...
At 21 Celsius room temp
Fan @ 25% = 8-9 min
Fan @ 28% = 9-10 min
Fan @ 30% = 12 min
recording before 100% fan kiks in.
To be a little more scientific, here are a couple of scenarios.
35% fan speed at room temperature. It just can't quite avoid the temps peaking. I often use 38% on long takes - I'll graph this when I get more time
And at 25% (on a scarlet, as our EPIC-M is limited to 35%) things get ugly fast. 25% is for short takes only, without a doubt.
What's worth noting is that reducing fan speed to reduce noise is marginally a game of diminishing returns. There's a smaller noise difference between 35% and 25% than there is between 60% and 50% for example. Compromising to 30% not 25% could double your safe record time for very little harm to the sound dept.
Just as significantly we should all bear in mind that sound dissipates on an inverse square rule.
ie. its possible in an intimate scenario that moving the camera position only a very small amount relative to mics will make a disproportionate improvement to the intrusion. Getting the mic 15 inches away rather than 18 and the camera 7 feet away not 6 could just make all the difference.
On another note, I learned today that 'auto' doesn't ride the fan setting up and down during record. I thought it did, but it appears only to 'thermostat' the camera in standby mode. Is that right? When I've another spare second I need to rtfm on that one.
Last edited by John Marchant; 05-03-2012 at 11:36 AM. Reason: added more data
John Merchant, you are one rockin' geek! Love it! Thanks.
would love for RED engineering to provide us this quality of data on all things Epic. Start with Black Shading: Signal to Noise at different temps and hard science on the topic - not fuzzy guidelines. Move onto a Compression matrix: data on a standardized/repeatable test scenario running from 3:1 up to 18:1 so we can see where the point of diminishing returns is: data rate/file size vs image quality. Heck, even a list of Tested & Approved 3rd Party Products would be a bit helpful. Someone has it at HQ . . . why not post it??
There's always time for this type of support since it dramatically reduces user guess work, on-set failures and warranty issues. "We're too busy inventing cool new stuff" doesn't cut it. I'm sure John and the OP are busy too.
That's the camera tests/results I would like to see - not some contrived Zacuto death match
Last edited by Josh Beadle; 05-03-2012 at 09:22 AM.
Are you doing this because the weathers so bad outside John lol?
Updated my post with a wedge more geektastic graphs. You know you all love it.
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