6D shutter speed changes?????

[SMiller]

Hi everyone, I am new here and if this question has been asked previously please point me to the post. I did browse through the previous questions but did not see this particular problem.

My probles lies with my 6D I shoot automobile racing with a 70-200 2.8 and a 580EXII flash, A couple weeks back during the night I was shooting manual mode and I noticed that my shutter speed kept changing on it's own, so I switched to TV mode and it worked fine for one week, but I noticed last night it started doing the same thing. I am setting my speed at 400 and repeatedly it would change to 200 or even lower, thus making my shots overexposed. Anyone have any ideas as to why this is happening??

[RobertTheFat]

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@ebiggs1 wrote:

Oh, yes, I do remember that.  Yes it was the mode dial that kept switching.  Man and it hasn't been all that long since I sold off all my xD cameras.  

But it still can't accidentialy be changed on the 1 D series.  Most controls require two buttons or dials.

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Incidentally, I'd be surprised if the 7D2 doesn't have the same type of (locking) mode dial as the 5D3. Canon even offers an aftermarket modification to install a locking dial on the 7D. I never had it done to my 7D's because it costs $100, but there have been times when I've wished I had.

Truth be told, the locking dial is a bit awkward to use, since you have to keep one finger on the button while two others turn the dial. An old man's gnarled fingers can find that a bit of a chore. The shutter dial of at least one of my film Nikons had a better arrangement: you pulled up the rim of the dial and turned it to set the speed. Then when you let go, it snapped back down and couldn't be turned.

[ebiggs1]

It is gone altogether on the 1D series.  

[soulzeshifter]

Hi,

I've been browsing about this issue and the answers so far couldn't help me. then i just played around with my setting which has been a while since i did it. And somehow i found the the solution for me..not sure it's the same issue for those seeking the answer though

Mine is solved by going to C.FnI : Exposure, then in menu no, 6 - Exposure Safety Shift. somehow it was set to 1. Enable (Tv/Av). not sure if it was the standard setting. But once i disable it, my shutter is not changing anymore when i use shutter priority

i've tested the Av mode, it still works as it used to (shutter changes according to the set apperture). and my problem solved now!!