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08-23-2019, 09:34 AM   #106
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QuoteOriginally posted by photogem Quote
No, this is not at all the case:
Thank you for your experience. Others have reported otherwise. A difference in live view vs. optical viewfinder is not diagnostic, but inappropriate stop-down (even once) is significant for both cases.


Steve


Last edited by stevebrot; 08-23-2019 at 10:19 AM.
08-23-2019, 10:21 AM   #107
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QuoteOriginally posted by stevebrot Quote
Thank you for your experience. Others have reported otherwise.
And where have others reported "otherwise"?
Here in this forum?
Can you supply links?
08-24-2019, 01:43 PM   #108
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Sadly the firmware reset did not fix it. A new symptom has shown up post firmware reset though and that is that pictures taken with OV now are dark as ever but when he takes photos with LV, they are fine.


By the way, the aperture test Steve posted a while back for testing for the aperture block problem showed that the aperture does not open super wide when it is set to F4.5 either both before and after the test.
08-24-2019, 05:43 PM   #109
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QuoteOriginally posted by tanz Quote
Sadly the firmware reset did not fix it. A new symptom has shown up post firmware reset though and that is that pictures taken with OV now are dark as ever but when he takes photos with LV, they are fine.


By the way, the aperture test Steve posted a while back for testing for the aperture block problem showed that the aperture does not open super wide when it is set to F4.5 either both before and after the test.
I will add this report regarding your dad's camera to the list. Was f/4.5 the maximum aperture for your dad's lens? It is important that the camera is set to not close the opening at all for exposure. Anything other than staying wide open indicates a problem. The test should also be not be done in live view.

Post back here with any news regarding repair or other cure. If still under warranty, sending it in for repair might be a good option.


Steve

08-29-2019, 06:00 PM - 1 Like   #110
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Precision Camera just replaced the “aperture control assy” and “resistor chip” on my k-70.
The nearly black images in all auto modes are gone. Exposures are now correct and the repair was performed astoundingly quickly.
08-29-2019, 06:27 PM   #111
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QuoteOriginally posted by rwhynacht Quote
Precision Camera just replaced the “aperture control assy” and “resistor chip” on my k-70.
The nearly black images in all auto modes are gone. Exposures are now correct and the repair was performed astoundingly quickly.
Thanks for the update. The replacement of the "resistor chip" is something new.


Steve
09-09-2019, 07:24 AM   #112
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So just had the black death on my K70 - sorry - possible aperture issue.

If I set the F-stop wide open (3.5 on this lens) and look in while on bulb mode the aperture is closed as much as it can be.
I held the shutter down to take a series of pics in auto of same scene and I got 3 very dark exposures followed by 2 correct then another dark. Seems to sometimes work.

I'm on holiday at the moment, so can't get to a repair station.
Spent the day in aperture priority mode or Tav with aperture set closed and pics looked as good as can be expected for a closed aperture.
Tried live view and as others experienced, the few I took seemed to work normally (there were a couple over exposed).
Tried 35mm prime rather than kit 18-135mm zoom with same result.

I bought March 2018 so 18 months ago and out of warranty (I suspect). Not happy! I don't know how to see number of shutter releases but I'm not a heavy user.
09-09-2019, 09:54 AM   #113
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UK is still part of the EU and anyway you have your 2015 Consumer Rights Act which goes further than the EU 2-years warranty if pushed rightly through:
But even under EU law you have 2 years, so go for it:
FAQs - Guarantees and returns - Your Europe

Any company within the EU giving just 1 year warrany tries to wiggle out of their duty! They hope people believe it and give in.
Shuttercount: Google shuttercount + Pentax and you find it

09-09-2019, 02:46 PM   #114
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Manufacture Date 2017:09:14

I'll be checking details about warrenty once I'm home at the end of the week. It was an ebay purchase - albeit a new camera.
09-09-2019, 02:48 PM   #115
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Sample photo attached. This was bright sunlight.
Attached Images
View Picture EXIF
PENTAX K-70  Photo 
09-09-2019, 05:08 PM - 1 Like   #116
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QuoteOriginally posted by riverrock Quote
So just had the black death on my K70 - sorry - possible aperture issue.

If I set the F-stop wide open (3.5 on this lens) and look in while on bulb mode the aperture is closed as much as it can be.
I held the shutter down to take a series of pics in auto of same scene and I got 3 very dark exposures followed by 2 correct then another dark. Seems to sometimes work.

I'm on holiday at the moment, so can't get to a repair station.
Spent the day in aperture priority mode or Tav with aperture set closed and pics looked as good as can be expected for a closed aperture.
Tried live view and as others experienced, the few I took seemed to work normally (there were a couple over exposed).
Tried 35mm prime rather than kit 18-135mm zoom with same result.

I bought March 2018 so 18 months ago and out of warranty (I suspect). Not happy! I don't know how to see number of shutter releases but I'm not a heavy user.
Welcome to the Pentax Forums!

I'm sorry to see that you are having problems, but thank you for visually confirming that your camera fails aperture control as the most likely cause. I have added your camera to the list in the original post. With any luck, you may still have warranty rights and are able to get this fixed at minimal expense. If you get the camera fixed, it would be very good if you were to post back here with what repair was done. Thanks in advance and good luck!


Steve

Last edited by stevebrot; 09-09-2019 at 05:20 PM.
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