Sigma 70-200, which need a re-chip to work

LensBeginner · 01-02-2015, 11:16 AM

Hi all,
I've read somewhere that some Sigma 70-200 need an updated chip for the (CDAF only? both?) AF to work with (some? all?) Pentax DSLRs; I believe it was on dpreview but can't find the page, and I can't find much in the Lens Database either.
Would a 70-200 f/2.8 APO DG EX (old screwdrive) work right off the box with any Pentax camera, maybe including a K-01 (I know, not the best match...)? What about the HSM versions?
Thanks in advance.

**Lowell Goudge** · 01-02-2015, 11:32 AM - **1 Like**

Don't know about newer bodies than K5D but I have used the same sit a 70-200/2.8 EX (non DG) lens with the *istD, K10D and K7D as well as my K5 with no need to "re chip". Use also with my PZ1 film body. For me a lens is a lens is a lens. Cameras are usually made to be backwards compatible with older sies of lenses, at least for pentax

**c.a.m** · 01-02-2015, 11:33 AM - **1 Like**

I have the 70-200 HSM II version.

When I first got it a couple of years ago, I enquired with Sigma Canada as to its inconsistent live-view/CDAF performance (K-7 at the time). They informed me I could send in the lens and they would update the chip, or firmware, at no cost to me. I never sent it in because I use it only in PDAF mode, in which the lens works very well on my K-5 II and previously on the K-7.

- Craig

Dave's clichés · 01-02-2015, 04:29 PM - **1 Like**

Older HSM Sigma lenses did not have firmware for LV CDAF because at that time cameras didn't have it, Sigma will update the existing chip with the newer firmware for free, you pay just the postage.

Edgar_in_Indy · 01-02-2015, 07:10 PM - **1 Like**

I know that at least some copies (most copies?) of the 50-150mm f/2.8 EX HSM II required a firmware update to work with live view CDAF. Maybe that's the lens you were thinking of?

LensBeginner · 01-03-2015, 01:07 AM

So apparently it's only a thing regarding HSM models?
Ok, then, thanks for the info!

01-02-2015, 11:16 AM	#1
LensBeginner Veteran Member Join Date: Sep 2014 Photos: Albums Posts: 4,696	Sigma 70-200, which need a re-chip to work Hi all, I've read somewhere that some Sigma 70-200 need an updated chip for the (CDAF only? both?) AF to work with (some? all?) Pentax DSLRs; I believe it was on dpreview but can't find the page, and I can't find much in the Lens Database either. Would a 70-200 f/2.8 APO DG EX (old screwdrive) work right off the box with any Pentax camera, maybe including a K-01 (I know, not the best match...)? What about the HSM versions? Thanks in advance.

01-02-2015, 07:10 PM - 1 Like	#5
Edgar_in_Indy Veteran Member Join Date: May 2010 Location: Indiana, USA Photos: Gallery Posts: 2,685	I know that at least some copies (most copies?) of the 50-150mm f/2.8 EX HSM II required a firmware update to work with live view CDAF. Maybe that's the lens you were thinking of? Last edited by Edgar_in_Indy; 01-02-2015 at 07:55 PM.

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01-02-2015, 11:32 AM - 1 Like	#2
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,886	Don't know about newer bodies than K5D but I have used the same sit a 70-200/2.8 EX (non DG) lens with the *istD, K10D and K7D as well as my K5 with no need to "re chip". Use also with my PZ1 film body. For me a lens is a lens is a lens. Cameras are usually made to be backwards compatible with older sies of lenses, at least for pentax

01-02-2015, 11:33 AM - 1 Like	#3
c.a.m Site Supporter Join Date: Jan 2013 Location: Ottawa, Canada Photos: Gallery \| Albums Posts: 4,189	I have the 70-200 HSM II version. When I first got it a couple of years ago, I enquired with Sigma Canada as to its inconsistent live-view/CDAF performance (K-7 at the time). They informed me I could send in the lens and they would update the chip, or firmware, at no cost to me. I never sent it in because I use it only in PDAF mode, in which the lens works very well on my K-5 II and previously on the K-7. - Craig

01-02-2015, 04:29 PM - 1 Like	#4
Dave's clichés Forum Member Join Date: Jan 2014 Posts: 98	Older HSM Sigma lenses did not have firmware for LV CDAF because at that time cameras didn't have it, Sigma will update the existing chip with the newer firmware for free, you pay just the postage.

01-03-2015, 01:07 AM	#6
LensBeginner Veteran Member Join Date: Sep 2014 Photos: Albums Posts: 4,696 Original Poster	So apparently it's only a thing regarding HSM models? Ok, then, thanks for the info!

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