但是所須校正值很小，幾乎調正負一或是完全不用調即可
目前感覺到原生鏡似乎沒有誤差的現象其實細究還是有一點點誤差
而FTZ轉接誤差因鏡而異，整體都比原生鏡誤差更大
某位網友實測
Z6
Tamron 70-200 G2 (+1) at 70 and 200
Nikon 105 Micro 2.8 (-2)
Nikon 24-70 2.8 S (0) 原生鏡
Z7
Tamron 70-200 G2 (+2) at 70 and 200
Nikon 105 Micro 2.8 (-6)
Nikon 24-70 2.8 S (0) 原生鏡
https://blog.reikanfocal.com/2018/10/the-new-nikon-z7-investigating-with-reikan-focal/
這個連結更有意思，在不同光圈下，其實最銳利的AF微調值其實會變動
像50 F1.4G看起來就蠻慘的...
不過在他們測焦的過程，Z的對焦重複性算是穩定
許多使用經驗指出FTZ轉接AF-C光線充足下，只會啟動PD，合焦就釋放快門，
若光線不佳或是特定對焦模式，才會加開對比對焦
"The phase detection autofocus system used by Nikon in
the Z6 and Z7 is generally accurate, but it is not always backed by
a contrast verification step. Indeed, contrast verification is not
performed most of the time; it’s only done in low light conditions or
with specific focus settings (e.g. Pinpoint AF)."
-Thom Hogan
但也有官方說法
Nikon engineers have now reached out to us and let us know that this initial answer was misinterpreted by us. The actual answer is that "both Phase and Contrast-Detect AF are in fact used when attaching an F-mount lens to the Z series cameras via the Mount Adapter FTZ."
現在韌體更新這麼多版，不清楚現在又變成什麼狀況
但若是PD+CD都啟動，理論上是不會移焦的
crossmatch wrote:
你就AF微調必要的意思是 ：
FTZ 是必要， Z 原生鏡就不必要
還是， 光線足夠下只會啟動PD對焦所以必要， 而光線不夠下用 Contrast detect 就不必要。 那就與是否用 FTZ 無關
