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FORUMS Photography Talk by Genre General Photography Talk 
Thread started 30 Sep 2013 (Monday) 13:00
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Had an interesting isue with my 7d this Sat.

 
flashpoint99
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Sep 30, 2013 13:00 |  #1

Had an interesting issue with my 7d this Sat. I was shooting a pop warner football game. I was on the sidelines using my 7d with a 70- 200mm 2.8 II. Kickoff was at 6pm. I was shooting in M..There was still plenty of daylight to keep the ISO @ around 400,stop the action with a SS of over 1000 and use an f stop of f4. Everything was going well and I was getting nice shots. As the first quarter ended the stadium lights came on as the sun began to fade. At that point I decided to change over to Av mode. Thats when things got weird. In Av I could not get a SS over 200. I upped the ISO. stopped down to 2.8 but whatever I did the camera was telling me I was no good. I then swtiched back to M and everything was fine. I had plenty of SS to the point I was able to drop the ISO back down again and maintain a fast SS. I figured at that point I had just made a mistake and again switched over to Av. Same issue. I have shot in Av many times and never had an issue so I figured it had to be a problem with my camera. I shut it off, pulled the battery waited abount a min and powered it back up. Again same issue in Av. Not wanting to miss any action I returned to M and shot the rest of the game without issue. When I got home, I again put the camera on Av and it worked fine. I am stumped as to why the 7D was not working on Av. Any experience with this issue or was it a glitch? Did the stadium lights in concert with the sunset cause an issue with my meter although I dont see how. Stumped!




  
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nathancarter
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Sep 30, 2013 13:04 |  #2

My guess is that you either had a flash attached, or the pop-up flash was up, or the camera THOUGHT the pop-up flash was up even though it was closed.

Av won't exceed maximum flash shutter sync speed, probably 1/200 on the 7D.


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flashpoint99
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Sep 30, 2013 13:17 |  #3

No external flash nor was the pop up flash in the up position .If that were the case the camera never indicated it. I can see an issue if the camera thought the flash was active ,that could explain it. You'd think pulling the batt would reset that fault if that were the case.




  
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nathancarter
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Sep 30, 2013 13:55 |  #4

It could have been a mechanical think instead of an electrical one - like the pop-up flash was closed enough to physically latch but not closed enough for the contacts or microswitch to know it was closed.

I vaguely remember having something like that happen to me before ...something like the flash button got pressed while the pop-up was obstructed, so it didn't open but the camera thought it was open.


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gjl711
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Sep 30, 2013 14:07 |  #5

nathancarter wrote in post #16335963 (external link)
Av won't exceed maximum flash shutter sync speed, probably 1/200 on the 7D.

7D has a 1/250th sync speed.


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xchangx
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Sep 30, 2013 14:13 |  #6

What metering mode were you using? There is/will be a significant difference between spot and matrix (or whatever you canon guys call it :) )


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flashpoint99
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Sep 30, 2013 15:47 |  #7

xchangx wrote in post #16336127 (external link)
What metering mode were you using? There is/will be a significant difference between spot and matrix (or whatever you canon guys call it :) )

Used evaluative metering. I did not change metering modes when switching to Av.




  
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gjl711
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Sep 30, 2013 18:05 |  #8

I don't think metering is going to limit shutter speed.


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tonylong
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Sep 30, 2013 18:58 |  #9

If things are now working "fine", well, who knows?


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Had an interesting isue with my 7d this Sat.
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