Nikon recently (and quietly) updated the D4's A firmware to 1.03.
Stated to improve autofocus with lenses having a maximum aperture of F8 it also seems to reduce the focussing system's tendency to jitter backwards and forwards when using faster lenses in conjunction with AF-C and a non-moving subject. Winter light levels in the UK prevent any investigation of whether the performance in very bright sunlight has also improved (the latter being a long-term problem - the D3 series focussing system was never at its best in brighter conditions).
Also worth mentioning, the battery charger for my personal D4 has been dogged by an irritating problem since new, namely it will routinely reject an inserted battery and cease charging within a few minutes of commencing a charge. The charger alternately flashes the CAL light and the charging light and according to the manual this indicates a fault in the battery itself. Since this happens with every battery I have for the D4 I've always considered this unlikely but have never been able to find time to take the charger in for repair. The short term fix incidentally is to remove and reinsert the battery, whereupon normal charging will resume. I've now found a better solution, which is to plug the charger in to the mains a few minutes before it is needed. Having done that, everything works as intended.
Tom Parkes is a London based corporate and editorial photographer
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