Any historic or known issues sigma DC lens (18-125mm) on a K10?

**marcusBMG** · 03-06-2019, 04:06 PM

I have had a lens returned to me cos the buyer couldn't get it to work on his K10 - lens wasn't recognised, wouldn't autofocus. This is a sigma DC 18-125mm. There's no fault I can detect with the lens on my K3, fully functioning. Buyer said his sigma 28-80mm (KAF mount) works fine. Any insight anyone.. buyer isn't demanding a refund, I offered to send him my other one, but since there's no fault with the returned one, might simply run into the same issue...

**boriscleto** · 03-06-2019, 04:11 PM

Did you ask if the buyer has the last K10 firmware? The 18-125 is an HSM lens...Or is it the older version?

Adam · 03-06-2019, 04:11 PM

Originally posted by marcusBMG

I have had a lens returned to me cos the buyer couldn't get it to work on his K10 - lens wasn't recognised, wouldn't autofocus. This is a sigma DC 18-125mm. There's no fault I can detect with the lens on my K3, fully functioning. Buyer said his sigma 28-80mm (KAF mount) works fine. Any insight anyone.. buyer isn't demanding a refund, I offered to send him my other one, but since there's no fault with the returned one, might simply run into the same issue...

Sounds like perhaps the K10D might need a firmware update to support the HSM autofocus?

**boriscleto** · 03-06-2019, 04:15 PM

Originally posted by Adam

Sounds like perhaps the K10D might need a firmware update to support the DC autofocus?

DC means it's an APS-C lens in Sigma terms...HSM is autofocus...unless it's the old version which had screw AF...

**marcusBMG** · 03-06-2019, 04:25 PM

I should have been more specific this is the older version, screw drive.

Sigma 18-125mm F3.5-5.6 DC Lens Reviews - Sigma Lenses - Pentax Lens Review Database

**Lowell Goudge** · 03-06-2019, 04:49 PM

I have had an issue from time to time with some lenses, specifically the sigma 70-200/2.8 and the alignment of the screw drive when swapping between the K10D and my PZ1

It seems that the k10 and the PZ1 leave the screw drive at different angles of rotation and the screw drive does not cleanly drop in place whe the AF motor starts to spin. It is a little fiddly but only when swapping to my PZ1 and back to the K10. No issue with *istD, K7, K5 or K1

Also, and not sigma only some times the contacts don't quite align and the lens info is not sent to the camera so it does not AF

03-06-2019, 04:06 PM	#1
marcusBMG Site Supporter Join Date: Nov 2012 Location: North Wales Photos: Gallery \| Albums Posts: 2,870	Any historic or known issues sigma DC lens (18-125mm) on a K10? I have had a lens returned to me cos the buyer couldn't get it to work on his K10 - lens wasn't recognised, wouldn't autofocus. This is a sigma DC 18-125mm. There's no fault I can detect with the lens on my K3, fully functioning. Buyer said his sigma 28-80mm (KAF mount) works fine. Any insight anyone.. buyer isn't demanding a refund, I offered to send him my other one, but since there's no fault with the returned one, might simply run into the same issue...

03-06-2019, 04:11 PM	#3
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,608	Originally posted by marcusBMG I have had a lens returned to me cos the buyer couldn't get it to work on his K10 - lens wasn't recognised, wouldn't autofocus. This is a sigma DC 18-125mm. There's no fault I can detect with the lens on my K3, fully functioning. Buyer said his sigma 28-80mm (KAF mount) works fine. Any insight anyone.. buyer isn't demanding a refund, I offered to send him my other one, but since there's no fault with the returned one, might simply run into the same issue... Sounds like perhaps the K10D might need a firmware update to support the HSM autofocus? Adam PentaxForums.com Webmaster (Site Usage Guide \| Site Help \| My Photography) PentaxForums.com server and development costs are user-supported. You can help cover these costs by donating or purchasing one of our Pentax eBooks. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, KEH, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

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03-06-2019, 04:11 PM	#2
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,477	Did you ask if the buyer has the last K10 firmware? The 18-125 is an HSM lens...Or is it the older version?

03-06-2019, 04:15 PM	#4
boriscleto Loyal Site Supporter Join Date: Dec 2009 Location: North Syracuse, NY Photos: Gallery Posts: 16,477	Originally posted by Adam Sounds like perhaps the K10D might need a firmware update to support the DC autofocus? DC means it's an APS-C lens in Sigma terms...HSM is autofocus...unless it's the old version which had screw AF...

03-06-2019, 04:25 PM	#5
marcusBMG Site Supporter Join Date: Nov 2012 Location: North Wales Photos: Gallery \| Albums Posts: 2,870 Original Poster	I should have been more specific this is the older version, screw drive. Sigma 18-125mm F3.5-5.6 DC Lens Reviews - Sigma Lenses - Pentax Lens Review Database

03-06-2019, 04:49 PM	#6
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,892	I have had an issue from time to time with some lenses, specifically the sigma 70-200/2.8 and the alignment of the screw drive when swapping between the K10D and my PZ1 It seems that the k10 and the PZ1 leave the screw drive at different angles of rotation and the screw drive does not cleanly drop in place whe the AF motor starts to spin. It is a little fiddly but only when swapping to my PZ1 and back to the K10. No issue with *istD, K7, K5 or K1 Also, and not sigma only some times the contacts don't quite align and the lens info is not sent to the camera so it does not AF