Canon EOS 400D Digital Camera Logo
Posted on Dec 27, 2009
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What is error 99

What does error 99 mean? I used a sigma wide angle lens and then when I put my original canon 18 - 55 lens back on, error 99 came up.

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Ian Waters

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  • Posted on Aug 21, 2014
Ian Waters
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Error 99 is a very general error meaning it could be several problems try this to track down exactly what the problem is .
1. Try your other lens and if it takes pictures just fine and auto focus is ok also its a problem with your Kit 18=55 mm lens.
2. Try cleaning the contacts on your kit lens using a pencil rubber or a cotton bud with a tiny amount of lens cleaner on it be careful not to let any of the rubbers dust into your lens.Replace the lens and see if the error 99 still comes up if it does then try this.
Take out both batteries the main and the lithium 2052 for at least 20mins.Replace and then try taking out the memory card if it still takes pics then your card is ok replace the card and try using the lens in manual mode if that takes decent shots then its the lens auto focus system.
As long as the mirrors look ok and it works with your Sigma lens its a fault with the kit lens.Try going to your local camera shop and fitting a kit lens that works and it should stop the error 99 if none of the advice works your camera needs a service.
Hope this helps i had the same prob and it was the kit lens and not the mirror system its usually one or the other with that fault number.

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  • Posted on Jan 11, 2010
Gary Maitland
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What wide angle lens is it need f number it may be to old to work on eos 400d

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  • Posted on Jun 24, 2012
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My Canon is displaying - Err 99 what should I do?

See if Sigma has any updated advice on this. Otherwise, I don't mean to sound rude or harsh, but unfortunately you may be out of luck with the compatibility...you will need to get a Canon lens. Error 99 is just a communication error and cleaning the contacts is about all you can really do so if that hasn't worked...I'm sure this is not the news you want to hear, but contact Sigma if you haven't already and see what they say.

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