5D mark III Central autofocus point performance with Tamron SP 150-600mm F/5-6.3
Today I discovered a very strange behavior of autofocus of this lens on 5D mark III.
If you use a single autofocus point it appears that the central point works much worse than others.
The main problem is in refocusing from near objects (~3m) to far away ones (30m).
If only a single center autofocus point is selected for use , the lens is refocusing from near objects to remote very badly. In many cases it gets stuck.
In fact, somehow, I obviously thought that the center point should give the best results. But it turned out that any other point except the central one provides much better refocusing (on 5D mark III). It works a bit slow but OK.
At first, I suspected that maybe it's my camera glitches. So, I put on the Canon EF300 / 4 L IS with 1.4x converter, and of cause the central point here worked exceptionally well with a Canon lens, so that means the camera is OK.
Just don’t understand how it is possible?
P.S.: The lens has actually been updated with the new firmware at a local Tamron service.
The AF menu, "Lens drive when AF impossible" is turned "ON".
I get odd results with the center point and my 100-400L too, so it's not likely to be 'just' Tamron's fault
5D3, 5D2, Sony α6000, G16 | EF: SY14/2.8, V20/3.5, 24/2.8, 35/2, Ʃ35/1.4, 50/1.8, Ʃ50/1.4 EX, 100L Macro, 17-40L, 24-105L, 70-200/2.8L IS II, 1.4x II, 2.0x III, 70-300L, T28-300 Di VC PZD | E: SY12/2, 35/1.8 OSS, 16-70 ZA OSS, 55-210 OSS, SY300/6.3 ED UMC CS, Metabones SB | Vintage FD & FL glass.