: gary adcock's Blog
: Saturday- Test, Test, Test.
Fletcher's Dana Hill and Arri's Michael Bravin through the camera's eye
Ok, for me camera testing is not just fun and games just going out to shoot pretty pictures in my world it is often the really boring testing that shows me something cool. I was doing what I call Runtime tests, where you shoot a slate running for the length of a record to check for any discrepancies between formats and capture modes.
My first surprise?
Short of pulling the SxS card out of the camera while recording, I was not able to corrupt the ProRes content on the SxS media.I tried everything I could think of that happens with P2 or the EX formats that cause corruption and I was not able to corrupt the content, however note that there is no card to card or spanning of the recording across 2 cards in the camera at this time.
The various flavors of ProRes and their recording times on the 32G SxS media listed below should only be used as a guide, the ProRes workflow is still being tested and is labeled as beta by Arri. All SxS recordings are using standard 1920x1080 frame rasters.
ProRes 4444 15min
ProRes HQ 22min
The other frame rates were removed at Arri's request. I jumped the gun a little.
Fletcher's Mike Sippel and I discuss Alexa
I am not going to be shy about saying that all cameras at this production level consume quantities of power, and while Alexa is nowhere near the needs of Sony's f23 and f35 with Onboard SR recording, where you can literally watch the batteries drain in real time.
Alexa does consume her fair share of power- I get about 90 -100 Minutes on an standard Anton Bauer Hytron 140 gold mount, I was surprised that the smaller Dionic 90 gave me nearly an hour of runtime, this is amazing when you take into account that Alexa is native 24V power and it is doing live 12v to 24v internally to power the camera and accessory ports ( the camera has both 24v and 12v power output ports)
Yet there is no need to be nervous about the power consumption, Arri has done done something I have not seen so far in a digital cinema camera, truly intelligent power management. If you are recording when your batteries start dying, the camera closes out the record, saving the file completely before fully shutting the camera down. You have the ability to change the remaining percentage of available, but Arri has the percentages close enough that I would leave them where they are. This was a big surprise, I have been one of the many people burned when not using RED Batteries during a shoot and the camera died without first closing out the file, loosing 20mins on the "A" camera during a concert shoot.
Tomorrow I will be talking about Speed and Sensitivity, I am going to leave you with this image, shot with available window light on the kitchen island in my loft on a partly cloudy day. That would not be a big deal, except for the fact that counter I am shooting on is nearly 20ft from the windows. This was shot at 800 asa @ f8 using Arri 100mm Macro, the partially open shades on the windows gave me light level at about 5 foot candles