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Forum: Troubleshooting and Beginner Help
07-06-2013, 03:13 AM
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malcallm yes, I have to take it back to a repair shop. Basically the motor that controls the apecture flap was broken and they just had to replace that.
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Forum: Troubleshooting and Beginner Help
05-05-2011, 02:42 AM
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Thanks. Well I've already mentioned that I have tried 2 lens and I am very sure it's not a lens problem.
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Forum: Troubleshooting and Beginner Help
05-03-2011, 02:33 AM
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erm yes and no. Yes cause it has a UV filter, and always had been there. No cause it won't dim the picture like that lol
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Forum: Troubleshooting and Beginner Help
05-02-2011, 05:40 AM
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Thx, not much help since optical preview only works with lens attached. But I can see now that even in viewfinder the image is darkended in optical preview, and that F-stop settings has no effect on brightness.
I can't see what's wrong with it, I guess I will have to phone Pentax. I hope it won't be expensive. Warranty just expired.
There is 1 year warranty only, I think that's a bit short in this year and age :/
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Forum: Troubleshooting and Beginner Help
05-01-2011, 05:18 AM
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Thanks, that's very relevant.
I was reading your reply number 6
What's a DOF button?
Currently the actuator lever is very firm. I cannot move it. If it's controlled by a linear motor without spring mechanism on a k-x then that's normal that I cannot move it. Can't see a spring either
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Forum: Troubleshooting and Beginner Help
05-01-2011, 05:08 AM
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Thanks. I think I know the partial cause.
The apeture actuator, which is a linear motor controlling a flap which moves during shutter release, pushing the apeture lever in the lens in process, seemingly ignores the F-stop setting. It is on the left of the camera when looking into the inside from front.
I manually blocked the lens lever so that the minimum apeture is bigger, and that produced brighter picture.
However, I cannot verify this is the case because after one removes the lens, the F-stop setting is unavailble. I can see however the actuator moves full step all the time. If it is to obey a F4 setting, it should not do so.
The cause of it ignoring the setting is unknown however.
I cleaned the contacts, and there seemingly is a contact on the lens contact ring on the camera, the fifth from vertical bottom when counting counter-clockwise. It looks depressed but at the same time looks like a different contact type. So I am not sure whether that is normal.
The others looks like steel spheres in holes, but the fifth one is a sunken flat pillar.
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Forum: Troubleshooting and Beginner Help
04-30-2011, 05:46 AM
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Done that just now, no help.
If I use LV before taking picture, strangely the pictures are brighter, but still not good enough
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Forum: Troubleshooting and Beginner Help
04-30-2011, 05:26 AM
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Bright sunshine outside, using auto mode:
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Forum: Troubleshooting and Beginner Help
04-29-2011, 05:05 PM
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The same behavior happens in both F-stop settings... The apecture remains fully open just before I press shutter release, then a diaphragm closes for 1/4 sec and opens up again. The size of the closed down apecture is the same as far as naked eye can judge...
The apecture closes if lens is unscrewed from camera
Thanks for the help from everyone so far, I am off to bed and I will investigate more tomorrow.
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Forum: Troubleshooting and Beginner Help
04-29-2011, 04:56 PM
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I can send you many many picutres of auto mode of anything I take. None of it will be correctly exposed. The AE metering is telling the correct settings to use, but the image that comes out somehow is not.
I've been under the sun today, taking auto-mode pictures all the time. that was outdoor. All the picture which came out were completely dark. Getting pitch dark pictures outdoor under the sun even with auto mode I can assure you is abnormal, and I have never seen anything like it. It's not the first time I take pictures. I know from experience that 1/150 at ISO400 is correct exposure for this amount of lighting.
All 3 AE metering mode I have tried, same effect
Now I will take one of my PC monitor, auto mode, relatively bright but my room light is also on so it's a normal situation.
AE tells me use 1/250:
As you can see below, pitch dark. I can honestly tell you this is what happens when I photograph outdoor under the sun as well.
No my lens cap wasn't on :P
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Forum: Troubleshooting and Beginner Help
04-29-2011, 04:37 PM
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That's what I did, when shutter is on, the apecture diaphragm closes like an iris and retain a smaller hole for light to go in. Correct me if I am wrong. I think the size of the hole is determined by F stop settings. To be honest I cannot tell the difference for the size of the hole between F4 and F22, for both lens.
Completely normal, as with video mode.
Nopes
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Forum: Troubleshooting and Beginner Help
04-29-2011, 04:32 PM
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I've clarify in that post that I've tried all camera modes, reseting custom function settings.
Batteries are fresh, I have just changed it. I even updated firmware from 1.01 to 1.02. I don't have a new set of SD card, but that shouldn't be the problem. Without the card this issue still present using digital preview.
Diaphragms on the lens are not stiff. The fact that both lens kit exhibit this problem makes it unlikely that it's the lens. The diapraghm is fully open until the shutter is released.This I have visually checked by just looking into the lens from front.
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Forum: Troubleshooting and Beginner Help
04-29-2011, 04:25 PM
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Thanks you are correct.
I did not use the manual mode. Any other mode produces the same result.
Sadly I went to delete the problem pictures just after the problem started.
I attached two photos.
The one with the woodpecker, is taken with manual mode, after auto picture mode produced pitch dark pictures. I increased ISO setting to compesate.
ISO6400 on a relatively bright situation, with 1/30 shutter speed at F4.5. At any normal situation using such a high ISO value, the image should have been white washed.
The other photo is me just now taking a picture of my ceiling lamp. I intentionally put the focus next to it instead of directly since AE was going to set my shutter speed to 1/1500 if I aim directly. With 1/180 even with F4.5, the picture as you can see is completely underexposed. This is abnormal as the lamp is bright and such a setting as suggested by AE is very reasonable.
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Forum: Troubleshooting and Beginner Help
04-29-2011, 03:47 PM
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Hi
My camera is broken today. The pictures it takes suddenly gone very dark, so dark that unless I have >1 sec exposure or point to it at a strong light or sun, all you can see is black color on both PC and LCD of the camera.
Even at ISO 12800 doesn't help at normal AE metering settings. AE metering showing what should have been correct exposure settings at +0EV will produce pictures completely pitch dark. I am not a beginer at photography and I can assure you this haven't happened before. It started happening today after I changed lens.
Now, I have tried both lens from the official kit, the 18-55mm and 55-200mm. Both have the same problem now. I have tried perform general cleaning on the lens and CCD sensor, I don't see anything wrong with it.
Changing ISO settings have an effect, so the setting is working. Changing shutter speed also works. One thing I can't verify is the apecture ring. Looking into the lens when I press the shutter, F4 and F22 looks the same size to me but I am not sure. Maybe somehow it's stuck at apecture setting? Nevertheless the picture can't be that dark surely.
Video works quite well though through the lens. If I take lens away and just perform naked CMOS shot, it comes out completely white.
I don't get this at all.
Any ideas?
Thanks very much
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