Question about Sigma 75-300mm f/4-5.6 DL Lens for Nikon AI
My Canon EOS 4000D keeps comming up with "error 99" whenever I try use a Sigma 75-300 zoom lens. Is there some defect with zoom lens? Can yuo help? "Thanks"
They where rechipping (some year ago). You can still use that lens but in AV mode. The new Canons are incompatible with the old Sigmas regarding aperture. If the machine needs to change it it will ALWAYS return a error 99. If the lens is on a bigger F stop you first need to use an old Canon (35mm) to open the aperture to the max (smaller F stop). Then you can use the lens but only in AV mode.
Posted on Jul 03, 2009
First, is the lens older than about five/six years old? If so then the electronics are almost certainly incompatible.
Error 99 is a generic code to say the camera isn't communicating with the lens. The first thing to try is thoroughly cleaning the contacts on the lens mounting flange, whilst doing so clean the contacts on the camera body as well. Don't use anything metallic to do this with.
If this fails then you either have a faulty lens or simply an incompatible one. By turning the lens slightly as if you're removing it, you can ensure that the contacts don't align correctly and then may be able to use the lens fully manually. Focus the old fashioned way and if there's an aperture ring you can set it to what you require: the viewfinder display may not show the correct exposure but will expose correctly when you press the shutter. It's a real bodge though and not something you'll be happy doing for very long.
Posted on Jun 30, 2009
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Posted on Jan 02, 2017
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