Diffrent between with and without motor

NewSuw · 31st October 2008

Hi wanna ask
what the different between
Tamron 28-75 (Nikon Mount) that have motor and that without??
i am using D90, and if i buy the one without motor will it still AF??

Blur Shadow · 1st November 2008

There is no difference, optically. The only difference is the motor. One is screw-driven, one has a built-in motor to focus. Both works very well, although the screw-driven lens tends to focus faster.

Yes, the screw-driven lens with work on your D90.

kayheem · 6th November 2008

Originally Posted by Blur Shadow

There is no difference, optically. The only difference is the motor. One is screw-driven, one has a built-in motor to focus. Both works very well, although the screw-driven lens tends to focus faster.

Yes, the screw-driven lens with work on your D90.

So, if you use the one with motor on the D90 (which is screw driven) won't it spoil the built-in motor in the lens? Do you need to turn the lens to manual focus (if it has the switch)?

Thanks!

calebk · 7th November 2008

Originally Posted by kayheem

So, if you use the one with motor on the D90 (which is screw driven) won't it spoil the built-in motor in the lens? Do you need to turn the lens to manual focus (if it has the switch)?

Thanks!

No, I believe you don't have to. I'm guessing the lens that has an in-built motor will not have the screw-slot on the lens mount.

Blur Shadow · 7th November 2008

Calek is correct. The model built-in motor does not have a screw-slot for focusing and will work normally on the D90. I've been using the built-in motor version on my D70 for 6 months now. No problems there.

kayheem · 7th November 2008

If the lens does not have the screw slot, then wouldn't the screw drive on the camera mount be grinding against something, unless, there is a dummy hole to fit the screw drive from the camera?

psychobiologist · 8th November 2008

Originally Posted by kayheem

If the lens does not have the screw slot, then wouldn't the screw drive on the camera mount be grinding against something, unless, there is a dummy hole to fit the screw drive from the camera?

once the slot key is depressed, there is some dis-engagement i think..

31st October 2008	#1
NewSuw New Member Join Date: Oct 2008 Posts: 20	Diffrent between with and without motor Hi wanna ask what the different between Tamron 28-75 (Nikon Mount) that have motor and that without?? i am using D90, and if i buy the one without motor will it still AF??

1st November 2008	#2
Blur Shadow Member Join Date: Sep 2005 Posts: 1,286	Re: Diffrent between with and without motor There is no difference, optically. The only difference is the motor. One is screw-driven, one has a built-in motor to focus. Both works very well, although the screw-driven lens tends to focus faster. Yes, the screw-driven lens with work on your D90.

7th November 2008	#5
Blur Shadow Member Join Date: Sep 2005 Posts: 1,286	Re: Diffrent between with and without motor Calek is correct. The model built-in motor does not have a screw-slot for focusing and will work normally on the D90. I've been using the built-in motor version on my D70 for 6 months now. No problems there.

7th November 2008	#6
kayheem Member Join Date: Jun 2004 Posts: 487	Re: Diffrent between with and without motor If the lens does not have the screw slot, then wouldn't the screw drive on the camera mount be grinding against something, unless, there is a dummy hole to fit the screw drive from the camera?