comparo 300mm

Focus on center.

AF confirm with Tamron 670Au and Tair (looks like AF confirm made a front focus).
"Eyes confirm" focus with Tamron 54B and 55B.
Auto Focus with Sigma.

F 4.5	F 5.6	F 6.3	F 8.0	F 11
	Tamron 670Au f5.6		Tamron 670Au f8	Tamron 670Au f11
TAIR 3S f4.5	TAIR 3S f5.6		TAIR 3S f8	TAIR 3S f11
	Tamron 54B f5.6		Tamron 54B f8	Tamron 54B f11
	sigma 70-300 APO f5.6	sigma 70-300 APO f6.3	sigma 70-300 APO f8	sigma 70-300 APO f11
			Tamron 500mm f8 55B