Canon’s wireless flash system means that you can fire two or more Speedlites together without any cables linking them.Check out the entire Infobank article at the Canon Professional Network.
Working with multiple Speedlites gives you creative control over your subject lighting. A main light can be used away from the camera, and other units can be used to provide backlighting or illuminate the background.
It has been possible to work with two or more flash units almost since the day they were invented. However, the problem has always been getting the exposure correct. Just synchronizing the flash outputs is not enough. You also need to control each output to give the correct amount of light for the subject.
Canon’s wireless flash does away with all this. You just set up the Speedlites and press the camera’s shutter release button. A series of pre-flashes are fired and the system automatically calculates the output required from each unit. It then fires all the units to give what should be a correctly exposed, well-balanced flash image.
The Canon wireless flash system is based on a master-slave relationship. The master unit is a flashgun, flash transmitter or built-in flash master fitted on or connected to the camera. The slave units are positioned on their own away from the camera. You can work with one master and one slave unit, or one master and between three and five slave groups. Each slave group can have one or more units. The system is very versatile, allowing almost unlimited control and creativity.
There are two types of wireless flash control within the Canon system. The newest and most versatile is the Radio Wireless system, introduced with the Speedlite 600EX-RT. The original system is an optical pulsed light system, found on previous Speedlite models.
"Thank you for helping us achieve our production of 100 million EF lenses worldwide*! In recognition of your continued support and the creativity you bring to the captured image, we are offering some of our best EF lenses at new prices. Long Live Imagination."While Canon states that the price drops are in celebration of 100 million EF lenses, we suspect that the increasing US dollar to Yen exchange rate may have been a contributing factor to making lower prices possible from a business perspective. One USD increased in value from 96.59 Yen in Oct 2013 to roughly 105 Yen today. [Sean]
* Refers to EF Lenses, EF-S Lenses and Cinema Lenses produced worldwide from 1987 to First Half of 2014.
"Peter Neill is one of life’s nice people. And yet the soft-speaking Irishman works in one of the most volatile businesses imaginable, where egos and excess converge with often-explosive results. The music business is not known for its manners, and yet here we meet a man who is charm itself. Could this be the secret to getting iconic shots of bands on the run? CPN Editor David Corfield finds out..."Check out the entire article (with 19 sample images) at the Canon Professional Network.
|Specification||EF-S 10-18mm f/4.5-5.6 IS STM||EF 16-35mm f/4L IS USM|
|IS Mechanism||Parallel-moving corrective optics (Single element.) IS unit is based on the one used in the EF-S 18-55mm f/3.5-5.6 IS II.||Parallel-moving corrective optics (Group of 4 elements.) IS unit is newly designed especially for this lens.|
|Shake Detection||Via gyro sensors (1 sensor each for yaw and pitch)|
|IS Activation||Turned on with the IS switch and activated by pressing the shutter button halfway (SW-1)|
|Centering/Lock when IS is Off||When the IS is Off, image stabilization optics are locked in place with a spring suspension mechanism rather than a center lock mechanism.||When the IS is Off, the image-stabilizing lens group is centered and locked in position.|
|Mode Selection||None (Automatic switching between normal shooting mode and panning mode is determined by gyro sensor signal.)|
|Vibration Reduction (Based on CIPA Standards)||Equivalent to 4 shutter speed steps faster (Focal length 18mm, 35mm equivalent: 29mm, using EOS 7D)||Equivalent to 4 shutter speed steps faster (Focal length 35mm, using EOS-1D X)|
|Dynamic IS/Hybrid IS||None|
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