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Forum: Pentax DSLR Discussion
08-21-2018, 05:35 PM
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I'd go for the DFA 15 -30, the DFA 80-200 and new DFA* 50 1.4. Then add a few extra $$ to get another K-1.
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Forum: Pentax K-1 & K-1 II
07-09-2016, 01:12 PM
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TEST CONDITIONS I did some further tests of the K-1 continuous autofocus tracking of a moving bicycle subject. There were three cases: 1) Full Frame, Select-9 AF mode; 2) Full Frame, Auto-9 AF mode; 3) APS-C Crop mode, Select-9 AF mode. Common settings for all three tests: DA*300/4 at F/4, DNG file format (no JPEG files), SR off (not that it matters), hand held, shutter about 1/2000 sec, AF hold off, composition level adjustment off, medium speed burst mode shutter, first frame action in Cont C set to focus priority (i.e. system locks onto focus before firing shutter), Action in AF.C Cont set to focus priority (i.e. system does not fire shutter unless it registers focus lock).
TEST RESULTS 1) FF, Sel-9: 21 images, 6 in focus, 15 out of focus; 2) FF, Auto-9: 26 images, 8 in focus, 18 out of focus. In both cases there tends to be a run of in-focus images (2 to 6) and then strings of out of focus. 3) APS-C, Sel-9: 24 images all in focus. There is a completely different feel to the tracking and shutter action in APS-C mode versus FF mode. In APS-C mode, it feels like the camera will go on forever (or at least as long as data buffer capacity is available) staying locked onto focus, firing the shutter and delivering 100% in focus images as it tracks the rider.
Some have asked for image files with EXIF data attached. I will include some in a separate post (I need to go to a different computer to get the files).
In another separate post I will describe what I thinking is going on technically. In summary, I think the K-1 optical and sensor hardware is fine to support reliable continuous focus tracking.
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Forum: Welcomes and Introductions
07-08-2016, 06:37 PM
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Greetings all,
I am grateful for the wonderful resource of the Pentax Forums and think it's about time I joined. As the title implies, I have a technical orientation although I love the art of photography (not that I am good at it). I've used most of the Pentax SLRs and DSLRs over the years and just keep upgrading. The digital era is fantastic. My initial motivation for joining the forum is to engage in a discussion about the autofocus, especially the continuous autofocus, of the Pentax K-1. I just started a new thread on this subject and look forward to learning how best to use and perhaps improve this function.
I feel the Pentax K-1 is a wonderful camera (except for continuous autofocus) and a fantastic accomplishment by a small (but hopefully now rapidly growing) camera company (compared to you know who). I think the K-1 business strategy, technical specifications and implementation (with the noted exception) are brilliant. Congratulations to the staff and management of Pentax.
It's a privilege to join the Pentax Forum community.
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