5D MIII Firmware Update and Sigma 500mm 4.5

Started May 9, 2013 | Discussions thread
egk4260 Contributing Member • Posts: 556
Re: 5D MIII Firmware Update and Sigma 500mm 4.5

Have you approached Sigma with this question?

Here is a somewhat related scenario. The majority of my gear is Nikon and I recently picked up the previously ridiculously priced V1 during its closeout. I got with it a lens adapter allowing me to use my DSLR lenses. The Sigma 85 f/1.4 lens would not autofocus. Sigma had me send in the lens for firmware upgrade. It arrived back in less than a week functional on that FT-1 adapter.

However, this adapter is really only a spacer. It does not alter focal length and therefore max aperture ratio like a TC, just positions lens so focal point is at sensor, much like those inter-brand lens mount adapters.

good luck


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