Compatibility of Sigma lenses with K70

Johnthevet · 01-04-2020, 02:31 PM

I have a Sigma 70-300 1.4-5.8 APO macro AF and a 24-70 aspherical AF which I used on a Pentax istD. Are these lenses compatible with the Pentax K70?
Many thanks in anticipation.

jeallen01 · 01-04-2020, 02:40 PM

Can't comment on that lens as I haven't had one, but, OTOH, I haven't had any troubles with other Sigma lenses on the K-5, K-3 & K3 II and now the K-70, apart from having to calibrate some of them on relevant bodies

The only thing I can add to the above is that the Pentax 55-300 "PLM" lens would be a massive "step up" in most respects from that "quite old" Sigma lens, if and when you could possibly afford one.

BTW, the K-70 is an "awsome" little beast regardless of anything else

gatorguy · 01-04-2020, 02:48 PM

Originally posted by Johnthevet

I have a Sigma 70-300 1.4-5.8 APO macro AF and a 24-70 aspherical AF which I used on a Pentax istD. Are these lenses compatible with the Pentax K70?
Many thanks in anticipation.

K-Mount lenses are K-Mount lenses. If it fit one K-Mount camera it will fit another like the K-70 and KP and K-1, the issue specific to the K-1 and certain Sigma's causing minor cosmetic damage to the body notwithstanding,

MikeyBugs95 · 01-04-2020, 02:50 PM

All K-mount lenses are compatible with all modern Pentax cameras. There are some lenses that can't use all of their functionality on some older DSLRs, like the DFA* 50 and the DA 55-300 PLM, but all older lenses are fully functional on Pentax cameras.

jeallen01 · 01-04-2020, 02:55 PM

The 55-300 "PLM" IS compatible with the K-70 "out of the box"

MikeyBugs95 · 01-04-2020, 02:58 PM

Originally posted by jeallen01

The 55-300 "PLM" IS compatible with the K-70 "out of the box"

I was talking about on older DSLRs like the K-10D.

jeallen01 · 01-04-2020, 03:08 PM

Originally posted by MikeyBugs95

I was talking about on older DSLRs like the K-10D.

Quite so!

OTOH, the OP is specifically interested in the K-70.

swanlefitte · 01-04-2020, 03:28 PM

The only incompatible thing is on the k1. Some sigma lenses scratch the overhang slightly.

**nitehntr** · 01-04-2020, 03:41 PM

Originally posted by swanlefitte

The only incompatible thing is on the k1. Some sigma lenses scratch the overhang slightly.

i have had communication issues with older film era screw drive sigma lenses and the K1 the older tamrons work just fine i have never been able to figure out what the problem is with the older sigma's on the K1

jeallen01 · 01-04-2020, 03:48 PM

Originally posted by nitehntr

i have had communication issues with older film era screw drive sigma lenses and the K1 the older tamrons work just fine i have never been able to figure out what the problem is with the older sigma's on the K1

PLEASE focus on the OP's original question (and apologies for my comments which probably lead to many of the following posts going "off-thread")!

gatorguy · 01-04-2020, 03:55 PM

Originally posted by jeallen01

PLEASE focus on the OP's original question (and apologies for my comments which probably lead to many of the following posts going "off-thread")!

The OP got his answer by the third post in. I'm assuming every answer since was a member working on post count for this month.

Adam · 01-04-2020, 04:32 PM

Originally posted by Johnthevet

I have a Sigma 70-300 1.4-5.8 APO macro AF and a 24-70 aspherical AF which I used on a Pentax istD. Are these lenses compatible with the Pentax K70?
Many thanks in anticipation.

If the lenses worked with your ist D, they will work with the K-70. With very few exceptions, older lenses will always work on a newer Pentax body.

hypermodern · 01-04-2020, 11:42 PM

Originally posted by Adam

If the lenses worked with your ist D, they will work with the K-70. With very few exceptions, older lenses will always work on a newer Pentax body.

I had a Sigma 50-150 f2.8 which worked perfectly on my K50 but wouldn’t communicate consistently with my K3ii, autofocus and aperture control dropped out intermittently. I’ve heard other people had similar problems with this lens on later Pentax DSLRs.

kypfer · 01-05-2020, 03:42 PM - **1 Like**

In answer (in part) to the original question, my Sigma APO 150-500mm DG OS HSM works perfectly on my K-70, as does my Sigma 18-50mm DC and my Sigma EX 70-200mm f/2.8 with it's matching 2x teleconverter. My only other Sigma lens is an old M42-screw 21-35mm, still in regular use, currently fitted to my *istDS

01-04-2020, 02:31 PM	#1
Johnthevet New Member Join Date: Jan 2020 Posts: 1	Compatibility of Sigma lenses with K70 I have a Sigma 70-300 1.4-5.8 APO macro AF and a 24-70 aspherical AF which I used on a Pentax istD. Are these lenses compatible with the Pentax K70? Many thanks in anticipation.

01-04-2020, 02:40 PM	#2
jeallen01 Pentaxian Join Date: May 2008 Location: London, UK Posts: 1,697	Can't comment on that lens as I haven't had one, but, OTOH, I haven't had any troubles with other Sigma lenses on the K-5, K-3 & K3 II and now the K-70, apart from having to calibrate some of them on relevant bodies The only thing I can add to the above is that the Pentax 55-300 "PLM" lens would be a massive "step up" in most respects from that "quite old" Sigma lens, if and when you could possibly afford one. BTW, the K-70 is an "awsome" little beast regardless of anything else Last edited by jeallen01; 01-04-2020 at 02:51 PM.

01-04-2020, 04:32 PM	#12
Adam Administrator Site Webmaster Join Date: Sep 2006 Location: Arizona Photos: Gallery \| Albums Posts: 51,594	Originally posted by Johnthevet I have a Sigma 70-300 1.4-5.8 APO macro AF and a 24-70 aspherical AF which I used on a Pentax istD. Are these lenses compatible with the Pentax K70? Many thanks in anticipation. If the lenses worked with your ist D, they will work with the K-70. With very few exceptions, older lenses will always work on a newer Pentax body. 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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01-04-2020, 02:48 PM	#3
gatorguy Moderator Join Date: Feb 2015 Location: Central Florida Photos: Gallery Posts: 6,092	Originally posted by Johnthevet I have a Sigma 70-300 1.4-5.8 APO macro AF and a 24-70 aspherical AF which I used on a Pentax istD. Are these lenses compatible with the Pentax K70? Many thanks in anticipation. K-Mount lenses are K-Mount lenses. If it fit one K-Mount camera it will fit another like the K-70 and KP and K-1, the issue specific to the K-1 and certain Sigma's causing minor cosmetic damage to the body notwithstanding,

01-04-2020, 02:50 PM	#4
MikeyBugs95 Pentaxian Join Date: Sep 2017 Location: New York Photos: Gallery \| Albums Posts: 1,206	All K-mount lenses are compatible with all modern Pentax cameras. There are some lenses that can't use all of their functionality on some older DSLRs, like the DFA* 50 and the DA 55-300 PLM, but all older lenses are fully functional on Pentax cameras.

01-04-2020, 02:55 PM	#5
jeallen01 Pentaxian Join Date: May 2008 Location: London, UK Posts: 1,697	The 55-300 "PLM" IS compatible with the K-70 "out of the box"

01-04-2020, 02:58 PM	#6
MikeyBugs95 Pentaxian Join Date: Sep 2017 Location: New York Photos: Gallery \| Albums Posts: 1,206	Originally posted by jeallen01 The 55-300 "PLM" IS compatible with the K-70 "out of the box" I was talking about on older DSLRs like the K-10D.

01-04-2020, 03:08 PM	#7
jeallen01 Pentaxian Join Date: May 2008 Location: London, UK Posts: 1,697	Originally posted by MikeyBugs95 I was talking about on older DSLRs like the K-10D. Quite so! OTOH, the OP is specifically interested in the K-70.

01-04-2020, 03:28 PM	#8
swanlefitte Pentaxian Join Date: May 2015 Location: Minneapolis Photos: Gallery Posts: 4,068	The only incompatible thing is on the k1. Some sigma lenses scratch the overhang slightly.

01-04-2020, 03:41 PM	#9
nitehntr Site Supporter Join Date: Jun 2009 Location: Rivesville West Virginia Photos: Gallery Posts: 238	Originally posted by swanlefitte The only incompatible thing is on the k1. Some sigma lenses scratch the overhang slightly. i have had communication issues with older film era screw drive sigma lenses and the K1 the older tamrons work just fine i have never been able to figure out what the problem is with the older sigma's on the K1

01-04-2020, 03:48 PM	#10
jeallen01 Pentaxian Join Date: May 2008 Location: London, UK Posts: 1,697	Originally posted by nitehntr i have had communication issues with older film era screw drive sigma lenses and the K1 the older tamrons work just fine i have never been able to figure out what the problem is with the older sigma's on the K1 PLEASE focus on the OP's original question (and apologies for my comments which probably lead to many of the following posts going "off-thread")!

01-04-2020, 03:55 PM	#11
gatorguy Moderator Join Date: Feb 2015 Location: Central Florida Photos: Gallery Posts: 6,092	Originally posted by jeallen01 PLEASE focus on the OP's original question (and apologies for my comments which probably lead to many of the following posts going "off-thread")! The OP got his answer by the third post in. I'm assuming every answer since was a member working on post count for this month.

01-04-2020, 11:42 PM	#13
hypermodern Senior Member Join Date: Jun 2018 Posts: 131	Originally posted by Adam If the lenses worked with your ist D, they will work with the K-70. With very few exceptions, older lenses will always work on a newer Pentax body. I had a Sigma 50-150 f2.8 which worked perfectly on my K50 but wouldn’t communicate consistently with my K3ii, autofocus and aperture control dropped out intermittently. I’ve heard other people had similar problems with this lens on later Pentax DSLRs.

01-05-2020, 03:42 PM - 1 Like	#14
kypfer Pentaxian Join Date: Jan 2018 Location: Jersey C.I. Posts: 3,592	In answer (in part) to the original question, my Sigma APO 150-500mm DG OS HSM works perfectly on my K-70, as does my Sigma 18-50mm DC and my Sigma EX 70-200mm f/2.8 with it's matching 2x teleconverter. My only other Sigma lens is an old M42-screw 21-35mm, still in regular use, currently fitted to my *istDS