Having problems with your Canon Digital Cameras ?

I have purchases a sigma 28-300 lens and it will not auto focus on my 350d. Manual focus is fine.


Answers :

Because it is a different manufacturer, there is no guarantee that the two will communicate fully.

You are actually doing well to not be having an error 99 message between the camera and the lens where you can't take photos at all and you have to keep removing the lens and cleaning the contacts.

If you do get that error at some point in the future, that will be the likely cause and solution, and the best advice I can give you is to get a Canon lens...I know that is just adding cost and not the answer you probably want to hear, but it is the most truthful answer I can give you.

Take Care and I Hope this Helps!
Repair Help & Product Troubleshooting for Canon Digital Cameras

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I have purchases a sigma 28-300 lens and it will not auto focus on my 350d. Manual focus is fine.


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