Sigma lens question for Canon 400D

[David A]

Quick question on the Sigma 18-50mm F/3.5-5.6 DC Lens for Canon EOS Digital SLR Cameras and the Sigma 70-300mm f/4-5.6 APO DG Macro Zoom Telephoto Lens

Do these have an autofocus motor in the lens or if not are they driven by the camera? I'm slightly confused as the sigma site only references the HSM motors which i don't think that these have....

Thanks

[slinky]

There is an AF motor in the 70-300..

[David A]

Thanks and the kit lens?

[Gemm]

I think any EOS-fit Sigma lenses (or any other makes) have an AF motor, but conventional motor (non-HSM) is slower and noisier.

Edited by Gemm on Sunday 20th May 20:14

[David A]

Thanks we will see when it arrives !

[mmertens]

slinky said:

There is an AF motor in the 70-300..

Are you sure? I had it for Nikon and there certainly is no AF motor in the lens... it's very cheap (certainly not bad for the price) and I don't think for the price it could have a motor...

[robdickinson]

mmertens said:

slinky said:

There is an AF motor in the 70-300..

Are you sure? I had it for Nikon and there certainly is no AF motor in the lens... it's very cheap (certainly not bad for the price) and I don't think for the price it could have a motor...

Canon EF bodies do not have built in AF motors, so every AF lens needs its own motor, so sigma put in cheap ones for low sepc canon lenses.

[mmertens]

robdickinson said:

mmertens said:

slinky said:

There is an AF motor in the 70-300..

Are you sure? I had it for Nikon and there certainly is no AF motor in the lens... it's very cheap (certainly not bad for the price) and I don't think for the price it could have a motor...

Canon EF bodies do not have built in AF motors, so every AF lens needs its own motor, so sigma put in cheap ones for low sepc canon lenses.

Ah OK. I stand corrected in that case! Sorry for potentially causing confusion.