Canon 5D3 + Canon 15mm f/2.8 Fisheye in AI-Servo restricted to 3fps

Hi everyone, 
when using the Canon 15mm f/2.8 Fisheye on the Canon 5D Mark III in Autofocus and AI-Servo, the camera seems to deliberately slow down its maximum frame rate to 3fps instead of its potential 6fps.
I have tested numerous lenses incl. the cheapest and slowest plastic fantastic Canon 50mm f/1.8, which all work at the camera's maximum frame rate of 6fps. Only with the 15mm fisheye, the camera seems to restrict the frame rate.
Why is that? And how can I avoid this from happening? Is this a deliberate software restriction?
On other Canon cameras the 15mm Fisheye works at full speed.
I know the old fish is not the fastest and most reliable autofocus lens in Ai-Servo but for me it works most of the time, especially for underwater sports. Even if it misses, half the time you get something super quirky!
Cheers, Alex

I had the same issue with my 40D, 7D and 5D Mk III. There is no way around it, and it should also happen with all other Canon cameras that shoot faster than about 4 fps.  You probably just didn't notice it.
The slowdown in AI Servo is caused by Arc Form Drive AF lenses that autofocus and stop down the diaphragm sequentially rather than simultaneously. Newer lenses are designed to do this simultaneously and will give you the full 6 fps in AI Servo.
Chuck Westfall describes it here:    Chuck Westfall - Digital Journalist (scroll down to the comments section)
Chuck Westfall  −
Except for the EF80-200mm f/2.8L and EF20-35mm f/2.8L, all other EF lenses with AFD (Arc Form Drive) focusing motors were designed in such a way that autofocusing and diaphragm operation (via the Electromagnetic Diaphragm, or EMD for short) were carried out sequentially rather than simultaneously. This has no impact on continuous sequences in One-Shot AF, because no autofocusing occurs after the initial AF lock in this mode. But in AI Servo, both the focus and the diaphragm are operated for each photo, and consequently the camera's framing rate decreases.
For what it's worth, AFD motors were phased out of the EOS system for all new lenses introduced from 1990 onwards.
Best Regards--Chuck Westfall
Mike Sowsun
S110, SL1, 5D Mk III

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