Simon Jori, a local Digital Imaging Technician, has shared with us his findings and thoughts on Arri’s new Open Gate. Thank you to Simon for sharing. Continue reading
Arri recently released version 9 of the Alexa Firmware. Part of this update, for Alexa XT cameras, is a feature called Open Gate. Open Gate uses the full resolution of the sensor, including the space reserved for look around to generate a 3414×2198 resolution ArriRaw image meant to be up scaled to 4k. One of the issues with Open Gate, is that Arri’s Frame line generator web app. is not capable of generating frame lines for the new sensor mode. Included in the White Paper for Open Gate is a work around to generate frame lines. It’s nice of Arri to offer a work around, but the really cool thing about it is the other use of the work around. Continue reading
The first step in unraveling the great mystery of what IR filters do, why you need one, and which one do you chose, has to start with an explanation of What IR is. Infrared light is a part of the electromagnetic spectrum just bellow what we call visible light. Visible light is a very narrow part of the electromagnetic spectrum that the human eye is sensitive to and allows us to see. This is measured in wavelength between 390-700 nm (nanometers). Essentially the longer the wave the warmer the light. Reds being in the bottom of that range and blues and violets at the top and a shorter wavelength. Infrared is actually split into three ranges described by their distance from the visible range. Continue reading
After seeing what Arri put out on their Facebook page the other day, I wanted to try to achieve something similar. For my test I used an Alexa Plus 4:3 with a Zeiss Master Prime at T1.3, and an EK87 Infrared filter. The Camera was set to 3200iso, 5600° kelvin, 358° shutter.
There are a number of options to adding cool streaky flares to your shots. I have discussed one of these before with a previous post called Poor Man’s Anamorphic. A more effective way to achieve this look is with an actual blue streak filter. Blue for that matter is just the popular option. Schneider, for example, makes a full range of streak colour options like orange, pink, green, clear…. The filter works by a series of blue lines across a glass filter. as a bright light source hits the line, it flares the light out sideways to cast a line of light across the image. A vertical line will cast light along the horizon. Continue reading
One of our Alexa shows recently encountered a situation where they really needed an extra monitor out with separate menu options. They were using ARRI Look files for monitoring out to the director and video village. The camera assistant was also using the monitor out for his on-board monitor. The DP and DIT were using the record out with Log-C and referencing back and forth to the Look files they had built in prep. Continue reading
The question came up recently regarding a Red Epic camera and IR Filters. Here’s the background. Digital cameras are very sensitive to light, and the infrared spectrum can cause your blacks to look red, also known as IR Contamination. The sensor cover glass in the camera is calibrated to remove Inferred light to give you the best colour rendition. ND filters will block light, but not in the infrared spectrum, so the more light you block with ND filters, the higher the ratio is of IR light. Over a certain level, the built in filtration is not enough. Arri recommends the use of IR Filtration at and above ND.9. I haven’t yet seen any specific recommendations from Red so I think it calls for a test. Continue reading