Sigma reports lens mount scratching issue with Pentax K-1, prepares fix for affected lenses


posted Thursday, May 12, 2016 at 11:33 AM EST


Third-party lens maker Sigma has today disclosed a potential issue with some of its lenses when used in concert with the just-released Pentax K-1 DSLR. Three current Sigma lenses and eight discontinued models are affected, and each can cause a minor scratch to appear in the K-1's body directly above the lens mount. The problem occurs only with the K-1, due to the mount on the Sigma optic protruding slightly further than that on first-party lenses, and Sigma notes that it is preparing a replacement part for optics suffering this issue.

Affected lenses in Sigma's current lineup include the following:

  • 30mm F1.4 DC HSM | Art

  • 35mm F1.4 DG HSM | Art

  • APO 50-500mm F4.5-6.3 DG OS HSM

Certain Sigma lenses can cause a minor scratch to appear on Pentax K-1 bodies. A total of eleven lenses -- three current and eight historic -- are affected, and a fix is being prepared.

A further eight discontinued optics can also cause the same problem. These include the following:

  • 50mm F1.4 EX DG HSM

  • 85mm F1.4 EX DG HSM

  • 24-70mm F2.8 IF EX DG HSM

  • APO 70-200mm F2.8 EX DG OS HSM

  • APO 70-200mm F2.8 II EX DG MACRO HSM

  • APO 50-150mm F2.8 II EX DC HSM

  • APO 120-400mm F4.5-5.6 DG OS HSM

  • APO 150-500mm F5-6.3 DG OS HSM

​For the time being, Sigma recommends not using any of these lenses with the K-1 body until a fix is available and has been applied to your lenses. The company also notes that for some of its lenses, the Pentax K-1 body will not correctly determine the crop factor -- either full-frame or APS-C -- and so users must manually make this selection. No list of optics for which this will be the case has been provided, but the company recommends configuring the camera to use full-frame for DG lenses, and APS-C for DC lenses.