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Forum: Troubleshooting and Beginner Help 02-04-2016, 01:39 PM  
Autofocus Problem K3 + 1.4x + 150-450
Posted By biz-engineer
Replies: 10
Views: 2,204
Nothing to do with the amount of light. When using 27 AF point, the AF move to the shortest focus distance, even outdoor in fully sun weather, when using 9 points of center point only, it works, even with less light: the AF servo moves in the correct direction. When using 27 AF point, the AF move closer and does not perform a full range attempt as it does when it misses focus in a normal case.
Forum: Troubleshooting and Beginner Help 02-04-2016, 09:32 AM  
Autofocus Problem K3 + 1.4x + 150-450
Posted By biz-engineer
Replies: 10
Views: 2,204
I know this problem, so I don't use 27 AF tracking when TC is mounted, I use 9 points and it works fine. To me, it's not that I had a faulty camera / lens, I think all K-3/K-3II have this same limitation (I have another problem that is AF does not always lock with center point with DA300... but I'm working on it). That said, there are a number of guys who are having their 7D+Tamy 150-600 AF servo that does not work...
Forum: Troubleshooting and Beginner Help 02-03-2016, 10:17 PM  
Autofocus Problem K3 + 1.4x + 150-450
Posted By biz-engineer
Replies: 10
Views: 2,204
That's what my K-3 does with HD TC + DA300 and AFC 27 points, unless when pre-focused and there is a lot of contrast between the subject and the background, otherwise, the camera does a full AF trip from infinity to nearest focus distance and get stuck there. With spot AF or 9 points AF, auto-focus works. So, it is not the same issue as your , but the common point is that the camera AF algorithm get stuck at nearest focus distance. Well, to check you AF module, you could manually focus and check if you get focus confirmation (green indicator) or not. Same thing with live view. And take a few shots, try DoF preview optical to check if the lens aperture is not stuck during AF operation. Try with different lenses with/without TC. Send the whole thing (camera+lens) for repair.
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