We received no resonse from Sigma when we inquired about whether there were any known compatibility issues in the Pentax version of the 30mm. This further supports the second theory proposed above. We tested the 30mm lens with the Pentax 1.4x teleconverter, and it was unable to lock focus on the K-3 in daylight, though it did "hunt" while attempting to do so. ![]() Some of our forum members have reported compatibility issues between certain Sigma HSM lenses and Pentax DSLRs, citing incompatibilites in the lens firmware and issues when using teleconverters. We will report on this should we learn more. Thus, a lens firmware update might solve the AF problem in the future. We suspect that the latter is more likely, as reviews of the Canon and Nikon versions of this lens have been favorable. We had no such issues with the Sigma 35mm F1.4 "Art", which leaves us with two possible explanations for the 30mm's poor performance: either the lens's low contrast at F1.4 has a negative impact on the camera's autofocus system, or Sigma's adaptation of HSM for Pentax is flawed in this particular lens. To confirm these findings, we verified that front/back focus was not an issue and then tested the lens on the Pentax K-50 and K-5 IIs in addition to our primary test body, the K-3. This erratic performance gave us considerable trouble with hand-held close-ups and resulted in a number of out-of-focus photos, also including landscapes. The performance worsened at close focusing distances, which while shooting often gave us the impression that the lens was at its minimum focusing distance even when was not. The overall AF speed is also not stellar. Both through the viewfinder and in live view, the camera would often focus slowly or simply fail to focus correctly, attempting to make micro-adjustments than would normally be necessary. While using it in the field, in the studio, and in outdoor tests, the lens did not consistently deliver reliable results. In addition, to make the lens easier to hold and to speed up the focusing performance, the focusing ring does not move while the lens motor is active, as you can see in the video.īefore we move on, we unfortunately have to report some bad news about the autofocus performance of this lens. This is a very handy feature, and one we've grown used to seeing on premium lenses. What about that forgotten film that was found when buying old camera?Īs we mentioned earlier, this lens supports full-time manual focus adjustments without the need to switch to manual focus mode.Weekly Challenge Winners Weekly Challenge*Weekly Challenge #634 The winter is coming.Photo Story European Green Woodpecker Eating.Weekly Challenge Weekly Challenge #635: Four or More.Project 52 PROJECT 52-11-66 (Supplementary) - NECESSARY THINGS - Clothing. ![]()
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