The problem with the autofocus on the Pentax K10D

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29.12.2008 10:26:00
Hello!
I have this problem: in the pictures from the camera Pentax K10D (version 1. 3) in the AF mode field area farther than I need: the sharpness or the background or on the ears, back of the head (in the portrait).
(sometimes zone of sharpness is closer to the "right" place, sometimes - on. Rarely, yet sometimes autofocus "hits the target»)
in the viewfinder when shooting can be seen that the sharpness where needed (for example, in front of - in portrait). (This, of course, can be a mistake to view..)

were tested camera with different lenses - the same result. These lenses with a different camera work correctly.
problem was and to update the camera software - has not disappeared after the update (up to 1. 3).
Different AF points behave the same mistake. The problem manifests itself in different lighting conditions: artificial light, studio flash, ample natural lighting. The camera was tested by different people.
(still produced dust from the mirror)

Prompt, than it may be caused by,
how to fix it
and what should I do?
 

29.12.2008 10:42:00


Fotozagadka or poltergeyts with K10D Pro autofocus and other tricks.

Again, auto / focus, read the forums tangled in the end

Software adjustment in CH Pentax AF, there is a need. . .

quote:
:
were tested camera with different lenses - the same result.
These lenses with a different camera work correctly.
and what should I do?
cameras - send to the service center or return back to the store.

29.12.2008 11:11:00
clear. prompt, description, which I did here is enough for the service center? or something else is required?

29.12.2008 11:19:00
quote:
:
clear. prompt, description, which I did here is enough for the service center? or something else is required?
If it is a service center of "Pentara" in St. Petersburg, it is likely they will ask for printed images in the format of 10x15 cm and will ask what's in focus.

29.12.2008 11:42:00
oh! Well, okay, I will prepare the prints. and everything?
(camera bought a year ago. First autofocus lens - a month ago. Naturally, I noticed a problem with the auto-focus recently. Such terms will not prevent anything? Type, I do not have pictures with "penalties" for the entire first year of use of the camera - and then just store asked if I do not drop the camera? * Do not drop *)


Fotozagadka or poltergeyts with K10D Pro autofocus and other tricks.
thank you for this link are considered the most specific cases. I read. I will understand more


29.12.2008 19:45:00
quote:
:
camera bought a year ago. first autofocus lens - a month ago. of course, I noticed the problem with the auto-focus recently. such periods will not interfere with anything?
depends on the duration, the type of repair to discuss the service center - a guarantee this is the case, or is a paid service for setting up auto-focus after the expiration of the warranty.
Call the service center - they're all tell you what to do and what to provide.
http: // www. pentax. ru / service /

29.12.2008 20:12:00
Just do not throw a locomotive!
kind of problem AF universal scale. I Olympus E-420, with whales all to the point strikes female, but as better put the full aperture optics seams, t. E. Do you have back-focus. . . Test test revealed a bug carcasses, optics everything is fine. The bug is that the focus area is the "norm" of the camera is too high for the quality optics, t. E. Wider depth of field of the lens, and hence misses. . . I will be after the holidays hollow odds for narrowing the focus area to a minimum (like it is possible to adjust the program, it is necessary only in the SC specialists exert all the way), let alone the lens elozeet than misses. . .
way you can determine what your bug. For this fiksiruesh camera angle of 45 degrees to the surface, placing the lens at maximum zoom, open the aperture, you put a straight edge. First, doing shots with AF "as is" and then doing shots in manual mode at the edges of the focus confirmation compare. If you zone the "norm" is equal to or greater than the depth of field, it is necessary to adjust the sensitivity of the subject, and if the zone is 2-3 times less than the depth of field and a miss "more" is a pure back-focus.

29.12.2008 20:39:00

you K10D, and you can adjust yourself

29.12.2008 22:21:00

bug is that the focus area is the "norm" of the camera is too high for the quality optics, t. E. Wider depth of field of the lens, and hence misses. . .
hmm, so really there? And whether it is possible to set up for my Alpha
 

30.12.2008 1:13:00

hmm, so really there? And whether it is possible to set up for my Alpha It is necessary to recognize the SC, in principle (in accordance with the fundamentals of electronics) the width of the focus depends on the sensitivity (gain) of the system, the higher the sensitivity of the narrower zone (dead), t. E. system responds to small phase mismatch probe. The downside is the fluctuation of the system (ёrzanie focus). If the gain is too high to make the system enters the vibrational mode is not acceptable. A stable system can be obtained either with high accuracy and perform a thorough tune (and this is more money) or "rough" system, the main thing that-be was enough for the whales (which is much cheaper). This situation will continue until not develop adaptive self-adjusting system AF phase, or at least introduce a simple algorithm for semi-automatic adjustment. By the way on the Panas soap dish in the service menu has a function, and quite efficient, but there is a contrast AF.
And more interesting comes out, one of the main arguments zerkalschikov (though I zerkalschik) against the compact, fast AF phase actually merges slower contrasting AF focus precision and stability of results over time. . . When I move in LiveView and focus with contrast AF is produced even more slowly than the compact digital cameras, but misses to focus aperture is almost there. . . So it turns out that all the future developments for the fast contrast AF rather than zerkalochnym phase, all the more so with time occurs unbalance phase system (dust on the sensor and the gradual displacement of the mirrors because they are all the time up and pecked down breakneck speed) is not present at the contrast AF. It is believed that the accuracy of the phase AF affects an even temperature. . .

30.12.2008 9:20:00

way you can determine what your bug
I take pictures ruler: in manual and autofocus modes, getting to the right place (= the place where I had seen in the viewfinder). The autofocus area field sometimes not evenly distributed (not start a little earlier, "the object of desire", but directly to him, and - further, perhaps to explain - I could "swing" when shooting).
in general, believe that there is a "simple" a reference to the back-focus problem is explained sometimes because the sharp image where you want, and the distance at which the slip are different.

(you may need to attach the image. How to do it?)

30.12.2008 9:46:00

(you may need to attach the image. How to do it?)

use the link "Leave a Reply" at the bottom of this page, use the controls on the "Attachments" below the text input field.

30.12.2008 13:37:00
quote ():
I have this problem: in the pictures from the camera Pentax K10D (version 1. 3) in the AF mode field area farther than I need: the sharpness or the background or on the ears, back of the head (in portrait).
'll have to test on the test target (the procedure is described on the same site, download the image to the target in the same place). If the results of testing the defect is confirmed, the photos show and when.

Focus System Pentax have actually constructive strange - I had the feeling that she does not like to move in the frame, among other things. By the way, the links above discussion smoked, and found something like an explanation these oddities.

30.12.2008 13:49:00
:
quote:


bug is that the focus area is the "norm" of the camera is too high for the quality optics, t. E. Wider depth of field of the lens, and hence misses. . .
hmm, so really there? And whether it is possible to set up for my Alpha

For your Alpha does not happen. Any Alpha set out to accurately brought into focus with the aperture optics.

30.12.2008 16:13:00


If you want to align the AF, then it is necessary to withdraw in affective mode. The target type http: // www. ixbt. com / digimage / lensvs. shtml is not necessary to align the camera + lens bundles. AF sensor larger than the red marker on the frosted glass and can not hang for what you want. You can determine the quality of this target AF in complex background, but adjust better as specified new DSLR camera Pentax K20D, Samsung GX20. Volume II. using flat minsheni, and then check on-demand subjects.
fact that different people get different ways, this is normal. Yesterday, one shot, our team, even 5, 6 come into focus one of six! group portrait shots with flash. best to do everything yourself, for monotony. Dust shake off the mirror does not work, you can only damage or bring down adjustment. In an extreme case, an enema or a soft brush to blow away very carefully.
If you wish to receive a normal result of the adjustment, it is necessary to stand and the same lighting conditions. Attempts to establish immediately at all distances and all types of lighting would only worsen the situation. This applies to any system, not even photographic.

30.12.2008 21:33:00
quote:
:
For your Alpha does not happen. Any Alpha set out to accurately brought into focus with the aperture optics.

 

31.12.2008 1:09:00

The autofocus area field sometimes not evenly distributed (not start a little earlier, "the object of desire", but directly to him, and - then, perhaps to explain - I could "swing" when shooting). Similarly, on my E-420 with lens ZD 14-54 / 2. 8-3. 5 wide open. If the angle of the line to less than 45 degrees, the depth of field starts right from the point of focus. just that and no longer in focus and tilt of the camera than closer to 90 degrees the more uniform distribution of the point of focus regarding the Gripen. And whales do not exist, all the time, "to the point" is not dependent on the angle to the line. . .
Here's a garbage produced. . . We think. . .


It is even possible, that's like an excerpt from a post - inserted word. Probable cause "priority distant objects." Often removed from the pre-defocusing and do it in Russian, in a big way, to infinity. Then include AF, which is moving to infinity, is stopped at the first sharp objects dropped into a zone, the farthest natural.
gee. . . I just do the same, but does not disable the AF, but first focus on distant objects, and then refocus on what we must do to close the focus is to infinity. . .
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The problem with the autofocus on the Pentax K10D

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