[latewind]

各位師兄:

日前得知 Tamron A16 裝在 Nikon D40 上不能自動對焦, 請問

是否 A16 內沒有裝對焦馬達呢?

如裝在 Nikon D80 等機身上是否要利用機身內的馬達推動呢? 是否如 F801 時代經軸傳動?

如裝在 Canon 機身上如 400D 是否可以自動對焦? 但 EOS 機身內好像沒有對焦馬達的?

敬請賜教

[pongyee]

請慢慢看：

http://www.dcfever.com/forum/read.php?f=1&i=499733&t=499733&phorum_auth=f57cb2bbf37f861e282ed07ce28bee8f&page=1

[老叟]

奇怪,弓都有既

[latewind]

ponqyee 兄 謝謝!

但該處完全未有解答小弟疑問,

相信很多師兄正使用這些器材, 希望有師兄能解答!

[vaworld]

除左 can0n mount a16, 其它mount 既全部無馬達.

[K_C]

A16 是沒有內置馬達的~ 對焦用相機內的馬達.

[Rol]

All Tamron (including A16) / Sigma lens for Canon must has motor in lens because all Canon body without motor.

All Tamron lens for Nikon is without motor in lens so rely on body motor for AF, but D40/40x without motor in body, so can't AF.

All Sigma lens for Nikon only HSM version has motor in lens. So only HSM lens use in D40/40x has AF.

[latewind]

Rol 兄所說似乎正確, 謝謝!

如所說只靠機身馬達驅動, 而之間須經軸承齒輪等, 速度應遠遠較慢.

未知是否如此?

[Rol]

yes, if condition same, motor at lens is faster than propel by body motor.

But exception is, AF 35/2 by body motor is faster than 500mm F6.3 by HSM sigma 50-500

Cos 35mm vs 500mm, F2 vs F6.3, zoom vs prime.