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02-11-2015, 05:29 PM   #1
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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, 05:58 PM   #2
hcc
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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
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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
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QuoteOriginally posted by Des Quote
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, 09:21 PM   #5
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QuoteOriginally posted by vagrant10 Quote
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.
02-11-2015, 09:52 PM   #6
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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
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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
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G'day Mate and welcome to the forum

02-13-2015, 02:50 AM   #9
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QuoteOriginally posted by Vinanne Quote
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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