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FORUMS Canon Cameras, Lenses & Accessories Small Compact Digitals by Canon 
Thread started 18 Jul 2011 (Monday) 16:59
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SX20 IS hot shoe problem.

 
DZK
Hatchling
6 posts
Joined Mar 2011
Location: Plovdiv,Bulgaria
     
Jul 18, 2011 16:59 |  #1

Hey guys,
I have an external flash. Osram C250 studio, it is over 20 years old I used to use it with my old SLR ,but it work(ed) with the SX20 as well. I`ve used it once or twice in the past (with the SX20) ,but when I tried to do so today it didn`t work for me. I checked the flash with a different camera and everything was alright. The camera detects the flash ,but doesn`t fire it. Has anybody encountered a similar problem,or does anybody know how I can fix it. I can`t see a reasonable explanation to it working with the SX20 yesterday and not doing so today. And due to the flash being OK ,I`m left with a problem with the camera.


Canon SX20 IS.

  
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lar55
Senior Member
277 posts
Likes: 5
Joined Dec 2010
     
Jul 18, 2011 19:19 |  #2

You might have damaged your SX20 flash circuitry with the old flash. This is an old thread that has some info: https://photography-on-the.net/forum/showthre​ad.php?t=228311

In summary, some older flashes had trigger voltages that are too high for some cameras. From the SX20 manual: "Using a non-Canon brand flash (particularly a high-voltage flash) .. may damage the camera."

And before you ask, yes, it can work for a while before it fails. Electrical damage can be cumulative, or random.




  
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DZK
THREAD ­ STARTER
Hatchling
6 posts
Joined Mar 2011
Location: Plovdiv,Bulgaria
     
Jul 19, 2011 06:44 as a reply to  @ lar55's post |  #3

I`m going to measure the trigger voltage of the flash. Have you got any idea what`s the maximum trigger voltage for the SX20? 6 volts or less?

P.S. I just measured the trigger voltage of the flash (between the two terminals) and it stated 4.3V. Still,there is no signal between the center pin and the hot shoe rail of the SX20 when shooting with an external flash. :(


Canon SX20 IS.

  
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c2thew
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3,929 posts
Likes: 4
Joined Aug 2008
Location: Not enough minerals.
     
Jul 19, 2011 21:11 |  #4

try using a different flash to make sure that the camera triggers it. if it does, then it's the connection to your oscram 250


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SX20 IS hot shoe problem.
FORUMS Canon Cameras, Lenses & Accessories Small Compact Digitals by Canon 
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