Canon 7D: Auto-ISO Flash Setting

category Cameras • hashtags Canon, 7D, 7DMk2, Flash • 1 min read

If you have your Canon 7D set to Auto-ISO and you slip your flash on, whether it’s a Canon flash or a third party flash, like Metz… What are the rules for the Auto-ISO? That will depend on the mode:

  1. Tv or Av or P or CA or Full Auto: The ISO speed will be set at ISO 400
  2. Av Fill-in Flash: If the pre-flash detects over-exposure …

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Flash: Factors In Controlling Exposure

category Cameras • hashtags Canon, 7D, Flash • 1 min read

The exposure mode determine the relationship between the flash and the camera. There are 4 different exposure modes when dealing with EOS Flashes:

  1. Aperture priority: Av
  2. Manual: M
  3. Program: P
  4. Shutter Speed priority: Tv
Mode Aperture Behaviour Shutter Behaviour
Aperture Priority: Av Set by the photographer Set by the camera for the ambient light: between a maximum X-Sync speed, 1/250 on a Canon 7D, and 30 seconds
Manual: M …

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Flash: Factors In Controlling Exposure

category Cameras • hashtags Canon, Nikon, Flash • 1 min read

A lot of people of people are afraid of flash. Flash is much more complicated and much more difficult to control because there are more parameters. Plus note of how many bad flash photos: the deer in the headlight look in a cavern.

One of the major problem is that people do not know what controls flashes:

Available Light Flash
Aperture Aperture
ISO sensitivity ISO sensitivity
Shutter speed
Distance from …

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Canon 7D: FEC: Flash Exposure Compensation

category Cameras • hashtags Canon, 7D, Flash • 1 min read

Contrarily to Nikon’s flash system, Canon’s doesn’t add the flash exposure compensation if it is set both on the camera and on the flash.

If you set the flash exposure compensation on the flash of -1EV and the of -0.5EV on the camera, the flash takes priority and the total exposure compensation is -1EV. The exposure compensation on the camera is ignored.

To contradict the previous …


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Canon 7D: Flash: Auto Focus Assist Light

category Cameras • hashtags Canon, 7D, Flash • 1 min read

Most of the Canon flashes have a big, monster red eye. It’s the auto focus assist light. On my 508EX-II, it’s made of 3 LEDs. When the ambient level of the light is low, it will illuminate to help the auto focus of the camera. But sometimes it doesn’t work.

The modern E series of the Canon flashes use a bar code pattern to illuminate the …


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Canon 7D: Fill-in Flash and Program Mode

category Cameras • hashtags Canon, 7D, Flash • 1 min read

If you turn on the flash and you are in Program mode and if the average light reading is fairly bright, the e-TTL-II will default to fill-in flash. Canon’s fill-in flash setting automatically applies a -2 flash exposure compensation for the Canon 7D. No user input is required.

  • What’s a fairly bright light reading? Around 13EV or f/8 @ 1/125s @ ISO: 100 or brighter. It …

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Canon E-TTL II Flash Metering

category Cameras • hashtags Canon, 7D, Flash • 1 min read

The E-TTL II is Canon’s second generation of the flash E-TTL metering system. E stands for evaluative, enhanced, embellished, improved improved…

A few basics:

  1. The E-TTL II always use the evaluative metering system with all modern EOS cameras. It doesn’t matter whether you are using evaluative, spot or average metering on the camera. It’s always evaluative matrix metering.
  2. E-TTL II never links exposure …

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