400 F/2.8 and 600 F/4 AF Accuracy with TCs poll

[marc]

Results will also vary of course on whether it's the 1.4 (external/NON built in) OR the 2.0 TC.
From my experience with my Z400TC:

1.4TC Internal/built in
STILLS: ZERO LOSS of AF accuracy
ACTION: ZERO LOSS of AF accuracy

1.4TC External/NON built in WITHOUT INTERNAL
STILLS: Virtually ZERO LOSS of AF accuracy
ACTION: Virtually ZERO LOSS of AF accuracy

2.0TC Without internal 1.4TC
STILLS; Minimal, (slower to lock) LOSS of AF accuracy
ACTION: A more noticeable slower & increased LOSS of AF accuracy, however I'd still rate that loss as more than acceptable and a night and day difference over the F mount 2.0TCIII

All these results are of course very subjective and one's MMV.

 

[Calson]

Huge difference between the DSLR cameras where one needed to guess the probable camera to subjects distances in inputting the autofocus offset values than a mirrorless camera and lens.

This was readily apparent when I took my wife's Olympus EM-1 camera and attached a new 300m f/4 lens and proceeded to photograph a lizard on a rock wall at a distance of 7 feet at 1/10s and the resulting images were as sharp as any I have seen. The Olympus and this lens have the equivalent of the Nikon Synchro VR with the Z camera and some of the S lenses.

With a teleconverter there is increase image magnification and any shortcomings in user technique becomes readily apparent. This includes subject motion blur with slower shutter speeds. Even with people standing and talking I know I need 1/80s or faster to avoid subject motion blur with the faces. With birds, even when perched on a branch, I need a shutter speed that is fast enough to avoid problems with them moving around.