no autofocus

whatsthisbuttondo
Posted 10/01/2011 - 11:55 Link
Just bought sigma 120-400 dg os hsm will not autofocus on samsung gx20 can anyone please help very much the beginner
gartmore
Posted 10/01/2011 - 12:06 Link
I know this sounds obvious but is the lens inadvertently set to manual focus?
Ken
“We must avoid however, snapping away, shooting quickly and without thought, overloading ourselves with unnecessary images that clutter our memory and diminish the clarity of the whole.” - Henri Cartier-Bresson -
pentaxanne
Posted 10/01/2011 - 12:31 Link
gartmore wrote:
I know this sounds obvious but is the lens inadvertently set to manual focus?
sounds about right.
whatsthisbuttondo
Posted 10/01/2011 - 12:39 Link
no lens and camera set to autofocus
whatsthisbuttondo
Posted 10/01/2011 - 12:40 Link
Should say this first hsm lens others all direct drive thanks pete
pentaxanne
Posted 10/01/2011 - 13:25 Link
the lens and body both need to be set to af.
whatsthisbuttondo
Posted 10/01/2011 - 13:28 Link
both camera and lens are set to autofocus have manual focus only
fatspider
Posted 10/01/2011 - 13:35 - Helpful Comment Link
A GX10 owner couldn't get my SDM lenses to work on his despite assuring me he'd updated firmware, though the GX20 should work with SDM/HSM lenses out of the box without any Firmware updates, it sounds like you've tried the obvious so only option is back to the shop and ask to try another, a bit awkward if bought online.

Are there any Pentax/Samsung owners in your area you could meet up with to try the lens on another body?
My Names Alan, and I'm a lensaholic.
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whatsthisbuttondo
Posted 10/01/2011 - 13:40 Link
will try local camera club to see if any pentax or samsung owners thanks
fatspider
Posted 10/01/2011 - 14:03 Link
Another option would be to visit a local camera shop and ask to try a SDM/HSM lens with a view to buying one
My Names Alan, and I'm a lensaholic.
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My Flckr link
greynolds999
Posted 10/01/2011 - 14:32 Link
Have you cleaned your contacts. Could be that causing the issue?
whatsthisbuttondo
Posted 10/01/2011 - 18:00 Link
just tried lens on camera with live view on camera makes noise and shudders as though its trying to do something. Perfect with direct drive lenses though ?
pentaxanne
Posted 10/01/2011 - 18:50 Link
have you got the latest firmware.
Edited by pentaxanne: 10/01/2011 - 18:52
greynolds999
Posted 10/01/2011 - 19:50 Link
You can get the firmware from here.

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