Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
05-11-2016, 03:17 AM - 1 Like   #1

Join Date: Jan 2012
Location: Tokyo
Photos: Gallery
Posts: 1,627
Sigma announcement about K-1 lens issue

Sigma has just announced that a number of their current and past lenses may damage the K-1 mount.

Use of Pentax mount SIGMA interchangeable lenses when attached to the ?Pentax K-1 - SIGMA CORPORATION

Not very happy news, but I figured it's something owners would want to know asap.

05-11-2016, 03:34 AM   #2

Join Date: Dec 2007
Location: Siberia
Photos: Gallery | Albums
Posts: 8,255
It means that Sigma even can't produce 100% the same K-mount and has no any agreement with Ricoh-Pentax about producing lenses with mount K.
05-11-2016, 04:08 AM   #3

Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 11,628
But what does it mean?

It sounds like they are saying Pentax made the K-1 mount ring dimensions physically different from previous cameras, or something.

When some SIGMA interchangeable lenses for Pentax mount are attached to the PENTAX K-1, the upper part of the mount can be scratched.
※This phenomenon is due to the interference with the shape of the upper part of the mount on the PENTAX K-1 camera body and it does not occur to any cameras other than PENTAX K-1.

Usage Notice for customers who are using Pentax mount SIGMA lenses on a PENTAX K-1
In some cases, depending on the lenses to be attached on the camera, the angle-of-view cannot be recognized automatically. Please select an angle-of-view that is appropriate for the lenses to be attached from “Crop” in the camera’s menu.
05-11-2016, 04:09 AM - 1 Like   #4
Site Supporter
Site Supporter
kev.pride's Avatar

Join Date: Feb 2008
Location: Modbury North, South Australia
Photos: Gallery | Albums
Posts: 348
Since the problem does not exist with any other K mount camera, instead of blaming Sigma I would suggest Ricoh has made a subtle change to the mount of K1 which has caused this issue. How can you read it any other way. Perhaps the problem exists with Tamron lenses also.


05-11-2016, 04:12 AM   #5
Senior Member
Genobreaker's Avatar

Join Date: May 2013
Location: Kansas
Photos: Gallery | Albums
Posts: 114
Does this apply to sigma lens that's not in that list? (I have a a 17-70 2.8-4)
05-11-2016, 04:17 AM - 1 Like   #6
Senior Member

Join Date: Jul 2008
Posts: 123
This bewilders me. The mount couldn't have changed, how could it? It's been the same since forever. Otherwise, even Pentax's own lenses would scratch the mount.

Very strange.

I assume that once they have all the details, the service will be done at the cost of Sigma, right?
05-11-2016, 04:26 AM   #7
Loyal Site Supporter
Loyal Site Supporter
Bengan's Avatar

Join Date: Nov 2012
Location: Stockholm
Photos: Gallery | Albums
Posts: 743
In the beginning of the document it says:
"We have found that some SIGMA interchangeable lenses for Pentax mount could leave a small scratch on part of the camera body when they are attached to the PENTAX K-1".

I read that as a scratch to the body just above the mount ring and not as a scratch to the ring itself.
I know that it reads further down that the scratch could be on the mount, but I think that's just a translation error. I could of course be wrong. It would be interesting to hear from someone that has both a K-1 and a listed Sigma lens.
05-11-2016, 04:27 AM   #8
Loyal Site Supporter
Loyal Site Supporter

Join Date: Jan 2008
Location: Virginia, USA
Photos: Albums
Posts: 257
It's a little bit confusing, but in reading that announcement it sounds like to me that they might be talking about the part of the body that slopes forward, just above the actual metal mount, that is actually getting scratched.

---------- Post added 05-11-16 at 07:27 AM ----------

What Bengan just said.

05-11-2016, 04:27 AM - 1 Like   #9
Veteran Member
fwbigd's Avatar

Join Date: Jun 2007
Location: Fort Worth TX
Posts: 339
Everyone should know by now that Sigma DOES NOT pay a license fee to camera manufactures. Sigma reverse engineers their lens to work with the various camera bodies to avoid paying the license fee. Therefore, Sigma must continually upgrade their firmware and hardware for the lens to work the new cameras bodies be it Nikon, Canon or Pentax. This is why Sigma brought out the docking station to easily upgrade the firmware.
05-11-2016, 04:28 AM   #10
Forum Member

Join Date: Jul 2011
Location: Edinburgh
Posts: 64
Perhaps it's on the body inside the mount?

05-11-2016, 04:30 AM   #11
Loyal Site Supporter
Loyal Site Supporter
dakight's Avatar

Join Date: Sep 2014
Location: Phoenix, AZ
Photos: Albums
Posts: 1,216
If you read the release carefully it says that the Sigma lens can leave a small scratch on the camera body... not the mount. The clearance where the body overhangs the top part of the mount is pretty tight so perhaps that's the issue. The mount per se has not changed but the body dimensions have. I don't have any of the affected lenses so I'm not terribly worried about it but I will certainly be mindful when considering future purchases. As I understand it, Sigma does not use the standard K-mount but have rather reverse engineered a compatible mount. They probably missed something in the dimensions that didn't matter until now.
05-11-2016, 04:31 AM   #12

Join Date: Jun 2009
Location: GMT +10
Photos: Albums
Posts: 11,628
Are Sigma saying some of their lenses are having trouble with this?

05-11-2016, 04:50 AM   #13
Forum Member

Join Date: Jul 2011
Location: Edinburgh
Posts: 64
QuoteOriginally posted by rawr Quote
Are Sigma saying some of their lenses are having trouble with this?
That was what I was thinking.

05-11-2016, 04:58 AM   #14
Veteran Member
Oldbayrunner's Avatar

Join Date: Mar 2013
Location: Havre de Grace, MD
Posts: 1,267
Crap all of my FF Sigma lenses are listed and these were what I was counting on using non cropped. I think Karma is telling me to stick with just using my wonderful K3ll and K5lls.
05-11-2016, 05:07 AM   #15
Loyal Site Supporter
Loyal Site Supporter
Scorpio71GR's Avatar

Join Date: Nov 2014
Location: Michigan
Photos: Gallery | Albums
Posts: 4,407
Rupert has been using his 50-500 OS on his K1. He has not mentioned any problems yet.

  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
announcement about k-1, body, camera, compatibility, design, dozen, dslr, full frame, full-frame, issue, k-1, k-1 lens, k1, lens, lenses, mount, nikon, pentax, pentax k-1, pka, scratch, sigma, sigma announcement, space, third party lenses
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
my 1-k words about the K-1 jimr-pdx Pentax Full Frame 35 05-15-2016 02:32 PM
Question How to Unpin the 'Pentax K-1 Full Frame' announcement at the top of page mee Site Suggestions and Help 8 02-26-2016 09:00 AM
Announcement no one is talking about: Macro converter GM-1 astron Ricoh GR 4 02-23-2016 02:31 PM
For Sale - Sold: Sigma 50mm f1:2.8 K-A Mount 1:1 Macro Manual Focus Lens $85 shipped to US Archimedes the Dog Sold Items 7 11-28-2015 09:46 AM
Dreaming about next PMA announcement regken Pentax DSLR Discussion 3 02-28-2007 08:24 AM

All times are GMT -7. The time now is 06:45 PM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]