Stu_bert said:
K-amps said:
privatebydesign said:
ahsanford said:
Also, didn't gripped cameras also deliver more power for AF on the superwhites at one point, if memory serves?
- A
Not sure about AF voltage, and I never noticed a difference , but the only way you can get 10fps with a 1VHS (last of the non gripped 1 series cameras) is to use the PB-E2
and the NP-E2 NiCad battery. The NP-E2 is the same actual battery pack, though not end cap, as the NP-E3 from the 1D/1Ds/1D MkII/1DS MkII/1D MkIIn line of 1 series cameras.
I think the 1Dx does drive lenses with greater voltage; case in point, the 85mm F1.2L AF's much faster on a 1Dx than a 5d3. I suspect EF in General lenses have voltage regulators built in to cater for this difference in Voltage between the 1 series and other bodies. The 85mm might just allow this greater voltage to be used to speed up AF, there might be others.
Correct, the 1Dx has a speed advantage with the large primes where is can drive the AF quicker through higher voltage. How much quicker - sorry, no idea, never seen any % comparison...
And how do you know that is down to a difference in voltage?
As far as I can see for the EF protocol AF voltage is 6V. Not 6-9V or ≥6V. The difference in AF speed could be down to faster clock speed, which comes from the camera body and probably the dedicated Digic processor on the 1DX, or from faster data transfer and response times.
I have seen it written many times that 1 series bodies deliver faster AF because they send higher voltage to the AF motors, but never seen anything that actually proves that. Having a higher voltage battery does not mean that voltage is passed on to the camera or lens circuits and the thought of 'souping up' the AF speed by simply applying more voltage is as whimsical as suggesting your computer will run faster if you plug it in to a higher voltage!
It wouldn't be difficult to adjust an AC kit for a rebel to deliver a 1 series AF voltage, I bet the lenses didn't perform at 1 series speeds though.