Sony Fs7 Owners Manual
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21 D. Preparing the camera and shooting ISO can be a little more confusing. ISO is used to determine the correct exposure for a camera when using an external light meter. As different gamma curves require slightly different exposure levels the optimum ISO (native sensitivity) will vary depending on the gamma curve used. STD Gamma curves = 800 ISO = 0dB Hypergamma HG1, HG2, HG3, HG4 = 800 ISO = 0dB Hypergamma HG7, HG8 = 1600 ISO = 0dB S-Log2 and S-Log3 = 2000 ISO = 0dB If you double the ISO, for example going from 800 ISO to 1600 ISO this is the same as adding 6dB of gain. So if you are using STD gamma and the camera is set to 1600 ISO that is the same as STD gamma at +6dB gain. I recommend that to avoid confusion when in custom mode you should use dB gain rather than ISO. Content sSection Index
22 D. Preparing the camera and shooting D3.2 To select the use of gain or ISO (MENU: Camera – ISO/Gain/EI – Mode). Manual gain control is then done via the gain switch on the side of the camera body the gain or ISO level assigned to each of the 3 switch positions can be set in: (MENU: Camera – ISO/Gain/EI – ISO/Gain) etc. To enable/disable automatic gain control press the Gain button on the camera body. If using the Cine EI mode please see the section on “Exposure Index”. Content sSection Index
23 D. Preparing the camera and shooting D4. White Balance (Custom Mode) Setting the white balance correctly ensures that white objects in the scene appear white and that the overall color response of the camera is true to life. There are several ways of setting the white balance. Pressing the white balance button on the camera will toggle between automatic white balance (ATW) and the white balance function selected by the white balance switch. ATW: The camera can determine the correct white balance automatically by continuously analyzing the scene being shot and adjusting the white balance while you shoot. This function is called ATW – Auto Tracing White Balance. Generally this works well but under some situations you may occasionally see a shift in colors while shooting. With the white balance switch you can chose between PRESET white balance and MEMORY A and MEMORY B white balance. Content sSection Index
24 D. Preparing the camera and shooting D4 .1 Preset The white balance can be fixed to a set value. When the white balance switch is set to PRESET the preset value is used. To change the preset value go (MENU: Paint – Preset White) and select the desired color temperature. D4.2 Memory Mode A and B There are two memories in the camera that will remember the white value for a white target. To set the white balance correctly aim the camera at a white target such as a piece of white paper that is under the same lighting as the rest of the scene. Expose correctly and then press the WB SET button on the front of the camera. This will store the white balance in the memory selected by the switch. D5. White Balance (Cine El Mode) When shooting using the Cine EI mode a white balance preset is selected using the white balance switch. Only 3 possible settings can be chosen, (Preset) 3200K, (A) 4300K, (B) 5500K. Choose the option closest to the scene you are shooting. Preset white balance is used to preserve the full dynamic range of the camera, fine tuning of the white balance would be done in post production as part of the normal grading process. Content sSection Index
25 D. Preparing the camera and shooting D6. Exposure, Zebras, Waveform and Histogram Exposure is controlled through a combination of shutter speed, gain/ISO, iris aperture and ND filter. The camera includes a number of tools for measuring exposure. D6 .1 Zebras Zebras are commonly used to measure the brightness of either skin tones or highlights. Zebra 1 is designed to be used for skin tones. (MENU: VF – Zebra). For STD gammas the default level of 70% works well in most cases, a small amount of zebras appearing across a face. However for the Hypergammas the zebra level should be reduced to 60% for good results. Zebra1 at 70% on skin tones with STD gamma (note how darker faces may not always show zebras at 70%). Content sSection Index
26 D. Preparing the camera and shooting In (MENU: VF – Zebra - Select) you can choose whether to show zebra 1, zebra 2 or both in the viewfinder. The zebras can be turned on and off via the push button on the side of the viewfinder or with (MENU: VF – Zebra – Setting). In Cine EI when a MLUT is enabled for the Viewfinder the zebras measure the exposure levels of the MLUT as seen on the viewfinders LCD screen, not the S-Log2 or S-Log3 recording level. Content sSection Index
27 D. Preparing the camera and shooting D6.2 Waveform Vectorscope and Histogram These are selected via (MENU: VF – Video Signal Monitor). Waveform: The waveform display measures the brightness of the recorded image and displays the brightness levels on a vertical scale that goes from 0% or black at the lower dotted line at the bottom to 109% (clipping point) at the top. There are additional dotted reference lines at 25, 50 75 and 100%. The left side of the waveform meter represents the left side of the image being recorded while the right side of the waveform meter is the right side of the image. The Waveform Monitor and the levels indicated Content sSection Index
28 D. Preparing the camera and shooting Vector: This is a vectorscope which is used to measure the color levels and color hue of what is being shot. In most cases it is not necessary to use the vectorscope. Histogram: The histogram displays the exposure brightness on a horizontal scale where black is at the left and 109% (clipping point) is on the right. The vertical height of the indicated level represents the amount of the image that is exposed at that brightness. Content sSection Index
29 D. Preparing the camera and shooting Video Signal Monitor Source: When shooting in the Cine EI mode it is possible to select whether the video signal monitor displays the levels of the recorded signal or the level of any LUT being used. Please refer to the Cine EI section of this guide to better understand which to use. The selected source signal is indicated just above the signal monitor. (MENU: VF – Video Signal Monitor – Source). The histogram Content sSection Index
30 D. Preparing the camera and shooting D7. Aper ture/Iris D 7.1 In Custom Mode the iris of an electronically controlled lens can be controlled automatically or manually. In the Cine EI mode only manual operation is possible. In Custom mode pressing assignable button 2 (iris) toggles between manual and automatic control. When manual control is selected the Iris Push Auto button can be used to momentarily set the iris automatically. When using auto iris it is possible to include an offset to the exposure to brighten or darken the image, for example to brighten a backlit scene via (MENU: Camera – Auto Exposure – Level). D7. 2 Custom and Cine EI modes The iris can be opened and closed using the iris control wheel on the side of the camera or by assigning iris control to the assignable dial on the handgrip (MENU: System – Assignable Dial). Content sSection Index