Odd Sensor Blemish on Canon 40D

Discussion in 'Mirrorless Digital Cameras' started by graham john miles, Feb 26, 2008.

  1. Has anyone seen a blemish like this on their sensors? Appears to be in the same spot regardless of composition leading me to suspect it is not lens related. Any suggestions?
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  2. You need to clean your sensor. You need to get a wet sensor cleaning tool. Search the archives - this is one of the most asked questions here. It's not a big deal to do it yourself - you will be very anxious when you do this the first time, but pretty soon it becomes routine.
     
  3. Not a blemish, sensor dust. Good place to read and learn to clean is Copperhill. http://www.copperhillimages.com/

    The in-camera dust cleaning system is not perfect and you probably will still have to do manual cleaning.
     
  4. I'm puzzled though by the perfect circle. I would have suspected a dust spot would be more irregular and more pronounced instead of translucent. Am I wrong?
     
  5. OK I see now. It's the shadow of the dust isn't it. And at smaller aperatures it becomes more translucent. Thanks guys.
     
  6. You may not need to go all the way to a wet cleaning system. I'd try the "rocket blower" technique that Canon recommends. If that doesn't work, I'd next get a "static" brush (ex. http://www.visibledust.com/ ), and only if that doesn't work get into the "pads and fluid" techniques.

    FWIW, I'm a big fan of the Copperhill folks. I have their original Eclipse and PEC-Pads kit, but I only use it about once a year - the rest of the time my Sensor-Brush does the job with much less worry (and I clean my sensor/filter frequently - as often as every day when I'm on an assigment).
     

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