Professional Technical Guide — N-Log Recording — En
Table of Contents N‑Log: A Primer.................................................................... 3 • Why Use N‑Log?................................................................................4 Filming N‑Log Footage....................................................... 6 • Using Camera Controls..................................................................10 • View Assist........................................................................................11 • Ensuring Consistent Exposure....
N‑Log: A Primer The term “N‑Log” is an amalgam of “N”, for “Nikon”, and “log”, short for “logarithmic function”. The logarithmic function in question is that used in digitizing light levels based on the density characteristics of negative film to render expo‑ sure differences much as humans perceive them. This is known as a “log curve”. The process of filming movies using a log curve is referred to as “logarithmic” or “log-format” recording.
l Why Use N‑Log? Shooting in N‑Log format preserves details in highlights and shadows and expands the range of effects available through color grading. Preserving Details in Highlights and Shadows N‑Log preserves highlights and shadows in high-contrast shots, such as those that mix indoor and outdoor lighting. Non– N‑Log Footage shot without N-Log shows loss of detail in highlights. N‑Log N-Log produces colors with less ap‑ parent contrast but more variation.
Improved Color Grading Third-party movie-editing software that supports color grading can be used to process the same footage in a va‑ riety of different ways, as is shown in the examples below.
Filming N‑Log Footage To record N‑Log footage, connect the camera to a digital recorder that supports 10-bit video. Use a Type C HDMI cable (available from third-party suppliers) and be sure the camera is off before connecting or disconnecting the cable. Choose cable with connector for external device To film N‑Log footage: 1 6 Select 10 bit for Output data depth. N‑Log footage can only be recorded at a bit depth of 10 bits. In the setup menu, select 10 bit for HDMI > Advanced > Output data depth.
2 Enable N‑Log recording. Return to HDMI > Ad‑ vanced in the setup menu and select N-Log for N-Log/ HDR(HLG) output options. Note that N-Log footage is recorded only to the exter‑ nal device, not to the cam‑ era memory card. 3 Configure the recorder for HDMI input. For details, see the documentation supplied with the device. 4 Start filming.
N‑Log Recording While N‑Log recording is in effect, Picture Controls cannot be used, ISO sensitivity cannot be set lower than ISO 800 or to values of from Hi 0.3 to Hi 2, Active D‑Lighting and high ISO noise reduction turn off automatically, and photographs will not be taken when the shutter-release button is pressed all the way down. The camera may also have trouble focusing; this is not a malfunction.
Filming N-Log Footage Frame Size/Frame Rate Note the following when choosing a frame size and frame rate for N‑Log recording: Frame size/frame rate Notes 3840 × 2160 60p (Z 7II only) N‑Log recording not available. 3840 × 2160 50p (Z 7II only) • Icons and characters in the monitor dis‑ 3840 × 2160 30p play at low resolution, but this has no effect on the footage actually recorded.
l Using Camera Controls If On is selected for HDMI > Ad‑ vanced > External recording control in the camera setup menu, you can start and stop recording using the camera movie-record button (for fur‑ ther information, contact the manufacturer). The camera displays A in movie live view and B during movie recording. During recording, check the recorder and recorder display to ensure that foot‑ age is being saved to the device.
Filming N-Log Footage l View Assist Although it increases the range of tones recorded, at default settings N-Log reduces the ap‑ parent contrast between colors when the footage is viewed in the camera monitor. If desired, the display of colors in the camera monitor can be simplified to enhance contrast for ease of viewing by selecting On for HDMI > Advanced > View assist in the camera setup menu.
Filming N-Log Footage l Ensuring Consistent Exposure If your recorder features a waveform display, you can film an 18% gray color chart and adjust exposure for a video signal level (IRE) of 35%, equivalent to a 10-bit code value of around 372.
N‑Log Specifications N‑Log specifications are available from the following web‑ site: https://downloadcenter.nikonimglib.com/en/products/558/Z_7II.
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