Does "slave" on Canon Speedlite 420EX work same as a "slave unit" of years ago?

Posted on 2007-07-21
Last Modified: 2008-01-09
I have a Canon G6 digital camera and a Canon Speedlite 420EX flash. I know the flash has a slave you can turn on. In the old days, a "slave unit" on a secondary flash would make the secondary flash go off if there were another flash in the room (nearby) [whether you wanted it to go off or not].
Can anyone simply tell me whether or not I can use that same set up...In other words, take a flash picture with my G6 and have my 420EX also flash? If so, how?
Question by:dgage123
    LVL 38

    Accepted Solution


    Yes. In fact, if triggered by an advanced Canon TTL-managed flash (one where the actual flash is controlled by the TLL light measurements of the camera itself), the 420EX will also be controlled by the camera in slave mode. I'm a Nikon user, so I can't tell you exactly how to turn this on, but if you examine the settings on the back of the flash, you should be able to set it into slave mode. If a non-TTL flash fires, the 420EX will also fire at the settings set on the flash itself. If a TTL flash fires, it should send a signal to control the 420X.

    LVL 4

    Author Comment

    I will look at the 420EX instruction manual again and see if it makes more sense.
    [I actually found my ancient slave unit and used it with my ancient Vivitar 283, but it would only work once...and it would not fire again unless I either turned it on and then off...or if I fired it manually. I don't know why but that is another situation.]
    Thanks for your answer and I will let you know (within the next few days) how it works.
    LVL 4

    Author Comment

    Since I only have a Canon G6, I really think the 420EX is much too much flash for what I need...I am probably going to sell it on eBay, especially since my 25 year old Vivitar 283 still works. (I just wish I had taken the 420EX out of the box sooner and played with it instead of waiting for two years.)
    Thanks for your help.

    Write Comment

    Please enter a first name

    Please enter a last name

    We will never share this with anyone.

    Featured Post

    How to improve team productivity

    Quip adds documents, spreadsheets, and tasklists to your Slack experience
    - Elevate ideas to Quip docs
    - Share Quip docs in Slack
    - Get notified of changes to your docs
    - Available on iOS/Android/Desktop/Web
    - Online/Offline

    The Nikon Coolpix L18 is an intuitive 8-megapixel point and shoot camera with a 3x optical zoom.  Nikon has done a good job of incorporating several features such as image stabilization, on camera red eye fixing, and a large three-inch display on th…
    Article by: Geoff
    The Canon 7D helps to bridge the gap between Canon’s professional cameras and their prosumer line, fitting nicely between the 50D and the Canon EOS 5D Mark II. This camera works well for an experienced amateur or is a great second camera for a pro. …
    This video teaches viewers how to process images for a time-lapse video. Programs required: Adobe Lightroom, Adobe After Effects, Video Editing Program. In Adobe Lightroom: Import sequence image files into Adobe Lightroom: Develop settings of an I…
    Excel styles will make formatting consistent and let you apply and change formatting faster. In this tutorial, you'll learn how to use Excel's built-in styles, how to modify styles, and how to create your own. You'll also learn how to use your custo…

    758 members asked questions and received personalized solutions in the past 7 days.

    Join the community of 500,000 technology professionals and ask your questions.

    Join & Ask a Question

    Need Help in Real-Time?

    Connect with top rated Experts

    8 Experts available now in Live!

    Get 1:1 Help Now