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Adjusting aperture on the EOS C500 Mark II.

Article ID: ART176224 | Date published: 01/31/2020 | Date last updated: 01/31/2020
 

Description

Included are instructions on how to adjust aperture on the EOS C500 Mark II.

Solution

Aperture

In CAMERA mode, you can affect the brightness of your recordings or change the depth of field by adjusting the aperture. Depending on the lens used, the aperture value displayed may differ (F value or T value) and available aperture values will vary as well. You can select the adjustment increment and even use the smallest iris increment allowed by the lens.
When the optional SG-1 Shoulder Style Grip Unit is connected to the camera, you can also adjust the aperture using the grip.

Manual aperture: Adjust the aperture value manully using the direct setting mode or the control dial on the camera or on the camera grip; or remotely, using Browser Remote on a connected network device.

Push Auto Iris: Momentary automatic aperture. During manual aperture, press the PUSH AUTO IRIS button or use Browser Remote to temporarily adjust the aperture automatically.

Automatic aperture: The camera adjusts the aperture automatically.

Required settings on EF Cinema lenses and broadcast lenses
To adjust the aperture from the camera, you will need to enable automatic adjustment using the controls on the lens. Required settings vary depending on the lens. Refer to the following table and the instruction manual of the lens used.
Lens Part used on the lens Setting for automatic adjustment
CN7x17 KAS S/E1, CN7x17 KAS S/P1,
CN20x50 IAS H/E1, CN20x50 IAS H/P1,
compatible broadcast lenses		 Iris operation change-over switch A
CN-E18-80mm T4.4 L IS KAS S,
CN-E70-200mm T4.4 L IS KAS S		 Iris auto/manual change-over switch A
 

 NOTES

  • When the optional SG-1 Shoulder Style Grip Unit is connected to the camera: To adjust the aperture from the grip, set the SG-1's IRIS (aperture control) switch to the M position. For details refer to the Cinema EOS System Expansion User Guide.


Manual Aperture: Changing the Aperture Value

  1. Select MENU > [​ Camera Setup] > [Iris Mode] > [Manual].
    • This setting is available only when a lens compatible with automatic aperture is attached to the camera. For non-compatible lenses, the aperture mode is automatically set to [Manual] and cannot be changed.
    • When using a compatible EF Cinema/broadcast lens, enable automatic adjustment on the lens.
  2. Select MENU >  [​ Camera Setup] > [Iris Increment] > [1/2 Stop] or [1/3 Stop].
    • You can also set MENU >  [​ Camera Setup] > [Fine Increment] to [On] to use the smallest iris increment allowed by the lens attached. Nevertheless, the aperture value displayed on the screen will be the closest value in the selected increment scale.
  3. Adjust the aperture value using the direct setting mode.
    • The selected aperture value will appear at the bottom of the screen.


Using the Control Dial

You can also adjust the lens's aperture value using the control dial on the camera or the one on the camera grip. By default, the function of both control dials is set to [Iris]. You can select the function assigned to each control dial independently.
  1. Select MENU > [ System Setup] > [Camera Ctrl Dial]
    (control dial on the camera) or [Camera Grip Ctrl Dial] (control dial on the camera grip) > [Iris].
  2. After closing the menu, turn the control dial assigned to [Iris] to adjust the aperture.
    • The selected aperture value will appear at the bottom of the screen.

 NOTES

  • You can use the MENU > [ System Setup] > [Camera Ctrl Dial Dir.] or [Camera Grip Ctrl Dial Dir.] setting to change the direction of the adjustment when you turn the control dial on the camera or on the camera grip, respectively.
  • If you set an assignable button to [Iris +] or [Iris -], you can press the button to respectively open up or close down the aperture.
  • When using an EF lens with no lens contacts or most EF Cinema lenses*, you cannot adjust the aperture using the camera. Adjust the aperture using the lens.
    * See the appendix for the list of EF Cinema lenses and broadcast lenses compatible with iris adjustment from the camera.
  • When using an EF lens that can correct the aperture value according to the position of the zoom, you can use the MENU >  [​ Camera Setup] > [Zoom-Iris Connection] setting to activate this correction.
  • When an optional RC-V100 Remote Controller is connected to the camera, you can adjust the aperture with the remote controller's IRIS dial. At default settings, turn the dial right to open up the aperture and left to close the aperture.
  • When an EF Cinema lens is attached to the camera, the aperture value displayed on the screen will be a T value. The aperture value (T value) displayed on the screen may differ from the indication on the lens's aperture scale.
  • When using an EF Cinema lens compatible with iris adjustment from the camera, when the iris is almost fully closed, the aperture value (T value) will appear in gray on the screen.
  • When using an EF Cinema lens compatible with iris adjustment from the camera, when you change the aperture value from a position of fully open or fully closed iris, multiple adjustment operations may be required until the aperture changes.


Momentary Automatic Aperture - Push Auto Iris

During manual aperture, you can press the PUSH AUTO IRIS button to have the camera temporarily take control and adjust the aperture automatically for an optimal exposure.
This function is not available when slow & fast motion recording is activated.
  1. Select MENU > [​ Camera Setup] > [Iris Mode] > [Manual].
    • When using a compatible EF cinema/broadcast lens, eneble automatic adjustment on the lens.
  2. Press and hold the PUSH AUTO IRIS button.
    • The camera will automatically adjust the aperture to obtain optimal exposure. As long as you hold the button pressed down,  will appear on the screen next to the aperture value.
    • When you release the button, automatic aperture mode will end and the  icon will disappear. The selected aperture value will appear at the bottom of the screen.

 NOTES

  • You can use the MENU > [​ Camera Setup] > [AE Response] setting to change how quickly the aperture changes during automatic aperture mode. This setting has no effect when using a CN7x17 KAS S/E1, CN7x17 KAS S/P1, CN20x50 IAS H/P1 or bradcast lens.
 

Automatic Aperture

When a compatible lens is attached to the camera, you can have the camera automatically adjust the aperture.
This function is not available when slow & fast motion recording is activated.
Select MENU > [​ Camera Setup] > [Iris Mode] > [Automatic].
  • When using a compatible EF Cinema/broadcast lens, enable automatic adjustment on the lens.
  • The camera will automatically adjust the aperture to obtain optimal exposure. The selected aperture value will appear at the bottom of the screen with an  icon next to it.

 NOTES

  • If you set an assignable button to [Iris Mode], you can press the button to toggle between the [Automatic] and [Manual] settings when a compatible lens is attached to the camera.
  • When MENU > [ Recording/Media Setup] > [Sensor Mode] is set to [Full Frame] and an EF-S lens or Super 35mm lens is attached to the camera, the camera will not achieve optimal exposure. Similarly, when MENU > [ Recording/Media Setup] > [Sensor Mode] is set to [Full Frame] or [Super 35mm (Cropped)] and a broadcast lens is attached to the camera, the camera will not achieve optimal exposure either.
  • The aperture value may change in the following cases.
    • While using the built-in extender or iris compensation function of an EF Cinema lens, when you switch from automatic aperture to manual aperture.
    • When the aperture controls on the lens are awitched between automatic/manual mode.
  • When using EF Cinema lenses/broadcast lenses that let you adjust the aperture gain, if the aperture gain is set too high, the aperture adjustment may not be stable ("aperture hunting"), depending on the shooting conditions. In such case, reset the lens's aperture gain to its initial value.


Exposure Compensation - AE Shift

Use AE shift to compensate the exposure that was set using automatic aperture, in order to darken or lighten the image.
You can also perform this function remotely using Browser Remote on a connected network device.
  1. Select MENU > [​ Camera Setup] > [AE Shift].
  2. Select the desired option.
    • You can select one of 17 AE shift levels from -2.0 to +2.0.
    • The selected AE shift level will appear next to the exposure bar and the camera will attempt to adjust the exposure accordingly.

 NOTES

  • If you set an assignable button to [AE Shift +] or [AE Shift -], you can press the button to adjust the AE shift level.
The exposure bar
The  on top of the exposure bar indicates optimal exposure without any shift (AE±0); the scale markings indicate the deviation from optimal exposure in 1/2 EV increments. The indicator inside the exposure bar represents the current exposure. When the difference between current and optimal exposure is larger than ±2 EV, the indicator will flash at the edge of the exposure bar. Optimal exposure will change depending on the light metering mode used.


Light Metering Mode

Select the light metering mode to match the recording conditions. Using the appropriate setting will help achieve a more appropriate exposure level when adjusting the exposure manually or using an automatic aperture function.
  1. Select MENU > [​ Camera Setup] > [Light Metering].
  2. Select the desired option.
    • The icon of the selected mode ( or , no icon for [Standard]) appears on the left of the screen.
Options
[Backlight]:
[Standard]:
[Spotlight]:
Suitable when recording backlit scenes.
Averages the light metered from the entire screen, giving more weight to the subject in the center.
Use this option when recording a scene in which only a certain part of the picture is lit, for example, when the subject is lit by a spotlight.

 NOTES

  • If you set an assignable button to [Backlight] or [Spotlight], you can press the button to turn the respective light metering mode on and off.
 

 

 

 


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