Sigma 12-24mm f 4.4-5.6 EX DG Lens


RodsPentax

Link Posted 22/11/2020 - 02:13
Can I use autofocus with a Sigma 12-24mm f 4.4-5.6 EX DG Lens (which has HSM) on a Pentax K1 body?
Iíve spent hours online trying t find out and Iím still not sure!
Many thanks for any advice!

bforbes

Link Posted 22/11/2020 - 07:35
if it's the Pentax fitting like mine it still has the focus screw drive. I'm not certain that the Pentax version has HSM link
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes
https://www.flickr.com/photos/189482630@N03/

Mike-P

Link Posted 22/11/2020 - 09:48
Yes it works fine but it's screw drive not HSM.
No equipment list here but thanks for taking an interest. My Flickr

RodsPentax

Link Posted 22/11/2020 - 11:07
Thank you both!
Iím not an expert in understanding how autofocus works so can I check my interpretation of this please.
Iím thinking that the screw drive you mention enables the cameraís innate autofocus to autofocus the lens (as long as it is a Pentax fitting - the one Iím interested does have this).
HSM is a separate additional (I think quicker) capability that this lens has when fitted to some cameras (Canon, Nikon etc with the appropriate fitting) but which this lens doesnít have on a Pentax - but the basic autofocus is still there. This is where I was uncertain but I think you are both reassuring me.

Mike-P

Link Posted 22/11/2020 - 11:14
Correct, the lens will autofocus fine on any Pentax DSLR including the K-1.

I sold mine when I bought the 15-30mm but the Sigma works fine on a full frame body. Just be careful to check it well as there is a tendency for this lens to be soft on one side of the image.
No equipment list here but thanks for taking an interest. My Flickr
Last Edited by Mike-P on 22/11/2020 - 11:15

RodsPentax

Link Posted 22/11/2020 - 11:26
Thanks Mike-P (and bforbes) - youíve reassured me greatly!
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