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Vinanne · 02-11-2015, 05:29 PM

First time user wanting to know information about 18-250mm lens I am want to purchase for my K10D. I recently purchased a Sigma brand 18-250mm lens but unfortunately the autofocus would not work. When I inquired about this with the supplier, it was a suggestion it could be a compatibility issue because the lens had "HSM". Any suggestions - I am travelling through Europe for 8 weeks soon and would rather take only one lens instead of the two I currently use........

hcc · 02-11-2015, 05:58 PM

The DA18-250mm is likely to work on the K10-D. (I do not have a K10D, but the DA18-250mm.) The DA18-250mm works on screw-drive autofocus.

The DA18-250mm is out of production but it is regularly available at PF marketplace, Keh.com, B&H Used and Adorama Used. I would use these in that older, with ebay the last option. I got mine from Keh.com.

The DA18-250mm is a great lens, manufactured by tamron. hence you may also find it as Tamron 18-250mm for K-mount, sometimes slightly cheaper. But it is the same optics.

Hope that the comment may help.

**Des** · 02-11-2015, 07:54 PM

SDM means that the lens has a small motor that works the autofocus (rather than being driven mechanically by the camera body through a small screw).

The K10D will work with an SDM lens if you install the latest firmware for the camera. Instructions and the download can be found here: Firmware Update Software for K10D | Software Downloads?RICOH IMAGING CANADA

That should fix it.

**mike.hiran** · 02-11-2015, 08:26 PM

Originally posted by Des

SDM means that the lens has a small motor that works the autofocus (rather than being driven mechanically by the camera body through a small screw).

The K10D will work with an SDM lens if you install the latest firmware for the camera. Instructions and the download can be found here: Firmware Update Software for K10D | Software Downloads?RICOH IMAGING CANADA

That should fix it.

is sdm (pentax lens motor) and hsm (sigma lens motor) the same? I've heard some older bodies don't work with hsm...

**Des** · 02-11-2015, 09:21 PM

Originally posted by vagrant10

is sdm (pentax lens motor) and hsm (sigma lens motor) the same? I've heard some older bodies don't work with hsm...

Yes they are. Sigma and Pentax use different names for this kind of lens motor.

Support for SDM & HSM lenses was introduced to Pentax DSLRs with the K100D Super (that is what made it Super and was the main feature that distinguished it from the K100D). A firmware update for the K10D released about the same time added support in that camera. All later model Pentax DSLRs (K200D, K20D, etc) included support for SDM/HSM.

Cameras earlier than the K100D Super/K10D (such as *ist, K100D and K110D) can't be updated to drive the AF mechanism in HSM/SDM lenses.

r0ckstarr · 02-11-2015, 09:52 PM

Also, the Pentax 18-250 will eventually suffer from lens creep. This means, if you don't have the lock switch on, and aim the camera at the ground, the lens will fully extend on its own.

**Kerrowdown** · 02-12-2015, 02:15 PM

As lots of other folk have already stepped up to the mark with replies to your question, I'll just say welcome to the forum.

**beachgardener** · 02-12-2015, 09:47 PM

G'day Mate and welcome to the forum

Vinanne · 02-13-2015, 02:50 AM

Originally posted by Vinanne

First time user wanting to know information about 18-250mm lens I am want to purchase for my K10D. I recently purchased a Sigma brand 18-250mm lens but unfortunately the autofocus would not work. When I inquired about this with the supplier, it was a suggestion it could be a compatibility issue because the lens had "HSM". Any suggestions - I am travelling through Europe for 8 weeks soon and would rather take only one lens instead of the two I currently use........

Thanks everyone for your help. I have uploaded to the latest version and now using the 18-250mm lens that I had repacked ready to return to the supplier. Yep one very happy person

02-11-2015, 05:29 PM	#1
Vinanne New Member Join Date: Feb 2015 Posts: 2	18-250mm lens First time user wanting to know information about 18-250mm lens I am want to purchase for my K10D. I recently purchased a Sigma brand 18-250mm lens but unfortunately the autofocus would not work. When I inquired about this with the supplier, it was a suggestion it could be a compatibility issue because the lens had "HSM". Any suggestions - I am travelling through Europe for 8 weeks soon and would rather take only one lens instead of the two I currently use........

02-11-2015, 09:21 PM	#5
Des Loyal Site Supporter Join Date: Jan 2014 Location: Victoria Australia Photos: Albums Posts: 6,285	Originally posted by vagrant10 is sdm (pentax lens motor) and hsm (sigma lens motor) the same? I've heard some older bodies don't work with hsm... Yes they are. Sigma and Pentax use different names for this kind of lens motor. Support for SDM & HSM lenses was introduced to Pentax DSLRs with the K100D Super (that is what made it Super and was the main feature that distinguished it from the K100D). A firmware update for the K10D released about the same time added support in that camera. All later model Pentax DSLRs (K200D, K20D, etc) included support for SDM/HSM. Cameras earlier than the K100D Super/K10D (such as ist, K100D and K110D) can't be updated to drive the AF mechanism in HSM/SDM lenses. Last edited by Des; 02-12-2015 at 03:08 PM.*

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02-11-2015, 05:58 PM	#2
hcc Pentaxian Join Date: Nov 2009 Location: Brisbane, Australia Photos: Gallery \| Albums Posts: 3,983	The DA18-250mm is likely to work on the K10-D. (I do not have a K10D, but the DA18-250mm.) The DA18-250mm works on screw-drive autofocus. The DA18-250mm is out of production but it is regularly available at PF marketplace, Keh.com, B&H Used and Adorama Used. I would use these in that older, with ebay the last option. I got mine from Keh.com. The DA18-250mm is a great lens, manufactured by tamron. hence you may also find it as Tamron 18-250mm for K-mount, sometimes slightly cheaper. But it is the same optics. Hope that the comment may help.

02-11-2015, 07:54 PM	#3
Des Loyal Site Supporter Join Date: Jan 2014 Location: Victoria Australia Photos: Albums Posts: 6,285	SDM means that the lens has a small motor that works the autofocus (rather than being driven mechanically by the camera body through a small screw). The K10D will work with an SDM lens if you install the latest firmware for the camera. Instructions and the download can be found here: Firmware Update Software for K10D \| Software Downloads?RICOH IMAGING CANADA That should fix it.

02-11-2015, 08:26 PM	#4
mike.hiran Site Supporter Join Date: May 2007 Location: portland Photos: Albums Posts: 1,491	Originally posted by Des SDM means that the lens has a small motor that works the autofocus (rather than being driven mechanically by the camera body through a small screw). The K10D will work with an SDM lens if you install the latest firmware for the camera. Instructions and the download can be found here: Firmware Update Software for K10D \| Software Downloads?RICOH IMAGING CANADA That should fix it. is sdm (pentax lens motor) and hsm (sigma lens motor) the same? I've heard some older bodies don't work with hsm...

02-11-2015, 09:52 PM	#6
r0ckstarr Veteran Member Join Date: Sep 2009 Location: Texas Photos: Gallery Posts: 3,507	Also, the Pentax 18-250 will eventually suffer from lens creep. This means, if you don't have the lock switch on, and aim the camera at the ground, the lens will fully extend on its own.

02-12-2015, 02:15 PM	#7
Kerrowdown PEG Moderator Join Date: Aug 2008 Location: Highlands of Scotland... "Hold Infinity in the palm of your hand" - William Blake Photos: Gallery Posts: 57,319	As lots of other folk have already stepped up to the mark with replies to your question, I'll just say welcome to the forum.

02-12-2015, 09:47 PM	#8
beachgardener Site Supporter Join Date: Sep 2013 Location: Australia Photos: Gallery Posts: 3,843	G'day Mate and welcome to the forum

02-13-2015, 02:50 AM	#9
Vinanne New Member Join Date: Feb 2015 Posts: 2 Original Poster	Originally posted by Vinanne First time user wanting to know information about 18-250mm lens I am want to purchase for my K10D. I recently purchased a Sigma brand 18-250mm lens but unfortunately the autofocus would not work. When I inquired about this with the supplier, it was a suggestion it could be a compatibility issue because the lens had "HSM". Any suggestions - I am travelling through Europe for 8 weeks soon and would rather take only one lens instead of the two I currently use........ Thanks everyone for your help. I have uploaded to the latest version and now using the 18-250mm lens that I had repacked ready to return to the supplier. Yep one very happy person

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