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08-19-2014, 12:20 PM   #16
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I've been experiencing this lately too, especially when camera scanning some negatives. It only happens on my D FA 50mm f/2.8 lens. I can easily get one out of four shots goofed up because my aperture went to f/32 instead of f/5.6. Yes, I have turned the camera around and watched the aperture close down. It happens in both LiveView and when shooting through the OVF ... but only on that lens. Every other lens is just fine. In LiveView, the aperture ends up stuck closed after taking the shot too.

08-19-2014, 12:57 PM   #17
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I don't think the lens is a factor because, as mentioned upthread, it's fine on my K110D.

The camera has now gone to Pentax for examination. I'll let you know what I hear.

Thanks all for the advice.
09-03-2014, 02:58 PM   #18
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245 from Pentax to replace the diaphragm

It didn't cost much more than that, and it's only done 2800 exposures.
09-03-2014, 03:17 PM   #19
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QuoteOriginally posted by MEtoK110D Quote
245 from Pentax to replace the diaphragm

It didn't cost much more than that, and it's only done 2800 exposures.
Are you still on warranty by any chance? I am not sure, but I believe that Pentax cameras in the EU carry 2 year warranties.


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09-03-2014, 11:30 PM   #20
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That's really helpful. I'll check today. The shop didn't mention it, but none of the staff who helped me were Pentax specialists.
09-04-2014, 02:23 AM   #21
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Now that I think about it, I did actually get the warranty out of the box before sending the camera for service. Have done so again. The warranty is one year, and branded Ricoh-Pentax Maybe on merger they brought Pentax in line with Ricoh? It was about that time that I bought the camera.

Going to bite the bullet, I think, but will ask about warranty on the repair...

My wife is rather reasonably suggesting that my cameras, costing so much compared to compacts, should do better than 20 months and 2800 shots.

Or, after 30 years, I could go Nikon...
09-25-2014, 07:34 PM   #22
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the same problem here

Hi MEtoK110D and 6BQ5, it happened on my camera, too. Did you guys find any solutions? Mine is also out of warranty. I talked to Pentax people on the phone and I was told that they were not aware of this issue. I don't think that is true though. This should be a defect for their product but they just do not want to do anything about it. PS, I just bought this last May.
09-26-2014, 04:14 PM   #23
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Depends what you mean by a solution. I'm due to collect the camera from the shop on Monday, after repair by Pentax. 245 for a replacement diaphragm and checking and cleaning. After only 2800 exposures, I'm not exactly happy, and I've been using Pentax equipment for 30 years (even though, as that number of exposures suggests, I'm not the heaviest user).

09-26-2014, 05:57 PM   #24
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Since the under exposure problem been observed by so many and on various models. I would like to share my experience of fixing a K-2000 "dark" picture problem here and hope that can help the fix-itselfers.

This is what it look like: (view from right side of body. The right side of picture is front of camera where lens is attached)

From bottom is the motor. It just a linear DC motor that drives a gear box. In the gear box there is a timing wheel which engage with a optical interrupter. Join together that controls the position and speed. The gears (and more inside) above that engaged with mirror and aperture actuator. The movement of aperture actuator also controlled by a solenoid above the gear box. This was where my problem started. The actuator of solenoid did not retreat which cause aperture fire at wrong time and at wrong position when mirror is flipped. The coil box of solenoid got slide off from the metal frame. The coil box is made of plastic and is positioned to the frame with two plastic "hooks" that got loose because not have enough (or no) sealant. Slide it back and add little glue fixed it.

I will guess this is most of "dark" picture issue is originated by looking at this weak structure of solenoid assembly design. Other part of gear box works fine. I abused them lot while trying to diagnose this problem and they all held very well.
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