Question about Canon Telephoto EF 300mm f/2.8L IS Image Stabilizer USM Autofocus Lens

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Autofocus on 300mm 2.8 IS not working with 50D

Testing out the 300mm 2.8 IS lens with a 50D Camera. Can't get the autofocus to work. Any tips?

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Make sure the AF/MF mode button on the lens is set to AF.
What focusing mode do you have selected in the camera? Single Shot, AI focus or AI Servo? 
If Custom Function "C.Fn IV -1 Shutter button/AF-ON button" is set to option 2 or 3, the AF will start when you press the AF-ON button.
I hope this help you!
/Chris

Posted on Jan 19, 2009

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Sigma DL IF 28-300mm F/3.5-6.3 Lens is ok for D40?


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Why wont my Nikon af nikkor 70-300mm G lens autofocus its self with my D5000 camera


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My Sigma 70-300 doesn't workin autoFocus mode. It


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New Camera


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Sigma 70-300mm DL Macro Super Lens compatibility for Nikon D40X DSLR Camera


Here is Nikon's specs of lens compatibility for the D40X:


Compatible Lenses*: Nikon F mount with AF coupling and AF contacts Type G or D AF Nikkor:
1) AF-S, AF-I: All functions supported;
2) Other Type G or D AF Nikkor: All functions supported except autofocus
3) PC Micro-Nikkor 85mm f/2.8D: Can only be used in mode M; all other functions supported except autofocus
4) Other AF Nikkor*â¹/AI-P Nikkor: All functions supported except autofocus and 3D Color Matrix Metering II
5) Non-CPU: Can be used in mode M, but exposure meter does not function; electronic range finder can be used if maximum aperture is f/5.6 or faster
6) IX Nikkor lenses cannot be used
*â¹ Excluding lenses for F3AF

They do not recommend 3rd party lenses, ever

Feb 01, 2008 | Cameras

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