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Hypothesis - comments invited

PeterBeckett

Lincoln, US
834 posts

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PeterBeckett Gold Member Donor Ribbon awarded for his generous support to the Fundraising Campaign 2014 Nikonian since 04th Jan 2010
Tue 19-Mar-13 05:08 PM

As I have admitted many times, I'm more of a techie photographer than I am an artist - having enjoyed a lifetime's association with hardware and software development. My experiences lead me to be curious about the relative auto-focusing speed between the D4 and other Nikon DSLRs.

I doubt that I'll be challenged if I state that the D4 achieves faster autofocus than its stablemates. That being the case, I propose that the governing factor might well be the "beefier" battery used in the D4 - which may well allow greater surge currents during auto-focus than the lesser batteries used in other bodies.

Unfortunately, I sold my D4 but do have a couple of D800s which use the, somewhat puny, EN-EL15 batteries. I have a Nikon AC adapter with the matching connector for the EN-EL15 and have used this during lengthy AF fine-tuning tests. I have the potential to power D800s externally, either by a HD battery or the AC adapter.

Would anyone like to suggest a good way to quantify speed-of-AF during tests with different power options? Results might be dominated by the in-camera power circuitry, but could well depend on the capacity of the battery to maintain voltage during the surge current while auto-focusing.

Pete

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