First 4 images are overexposed

HArendsen · 11-03-2022, 05:02 AM

How comes?

Everytime I turn on my K-5II and I do some clicks the first 4 images are overexposed, nearly white.
In RAW I cant do anything to make them better.

**Lowell Goudge** · 11-03-2022, 05:45 AM - **3 Likes**

Care to share a 5-6 frame sequence including camera exif data?

Ausable · 11-03-2022, 06:48 AM

Originally posted by HArendsen

How comes?

Everytime I turn on my K-5II and I do some clicks the first 4 images are overexposed, nearly white.
In RAW I cant do anything to make them better.

Does this happen with all of your lenses or just one? I am wondering whether the problem might be caused by aperture blades sticking after a period of inaction.

**FozzFoster** · 11-03-2022, 08:31 AM

is your bracketing turned on? or exposure compensation?

Ryszard · 11-04-2022, 08:28 AM

Originally posted by HArendsen

Everytime I turn on my K-5II

Mine does 1st frame black after a week in the drawer. And it's not ABF, not an entry-level camera. I'll study my case and share information, assuming that I could ever find the root cause ;-) However, I'm going to check other lenses and clean all exposed electrical contacts. This should be good starting point.
p.s. Camera acquired very recently, second hand, mint appearance and 70k clicks.

HArendsen · 11-06-2022, 01:03 PM

Originally posted by Lowell Goudge

Care to share a 5-6 frame sequence including camera exif data?

I found something strange in the exif data.
The first over exposed images there is no Exposure Program data...

**Lowell Goudge** · 11-06-2022, 02:17 PM

Originally posted by HArendsen

I found something strange in the exif data.
The first over exposed images there is no Exposure Program data...

What does it show as the lens connected? It may be that no lens was detected through the data pin

Ryszard · 11-17-2022, 03:53 AM

HArendsen - any new findings? I updated the firmware and re-set all possible settings, which wouldn't help at all. Then I took IPA to clean all connectors (lens, lens mount, battery and it's compartment). We'll see ;-)

HArendsen · 11-23-2022, 06:12 AM

Still no clue. I can live with it, but it becomes ennoying.

Ryszard · 05-31-2023, 11:30 AM

I'm getting used to my issue. Checked carefully what's happening, here's the sequence:
a) mirror flaps
b) 2nd curtain closes
c) 1st curtain opens
d) mirror goes down, shutter is cocked and cures itself magically.
From this moment it works properly. Tested in several modes, different lenses, high/low ambient temperatures etc. Just the initial exposure fails.

scwinn · 10-25-2023, 06:51 AM

Could it be the onset of the dreaded aperture block problem??

Ryszard · 10-26-2023, 12:22 AM

In my case? Definitely not. The K-5 has different aperture control mechanics. And I observed the shutter curtains behavior without the lens. It's the shutter, I'm sure.

**photogem** · 10-28-2023, 01:24 AM

Originally posted by scwinn

Could it be the onset of the dreaded aperture block problem??

The dreaded ABF happens only to Pentax DSLRs since the K30 using a solenoid for aperture control.
Also the two early semi-professional K10D and K20D used it as well, it was a different solenoid "made in Japan",
while from the K30 up to the K-70/KF it is made in China. Only since Jan. 2021 onwards Ricoh finally solved it,
so late K70's and the KF don't suffer the problem anymore.
The problem wasn't Ricohs fault but the manufacturer in China used a cheap alloy which changed the magnetic characteristic of the alloy over the time.
The solution was finally very simple, just a smaller permanent magnet was needed.
From the K7/5 etc. (and KP and K-01 as well) Pentax used a stepper-motor for those instead of a solenoid, a more expensive and "larger" solution,
but of course much better.

Sandy Hancock · 10-28-2023, 01:43 AM

Resurrected after a year of inactivity and it now becomes another solenoid thread?

As photogem said, this is NOT a solenoid issue as the K-5 series bodies do not have that component. On top of that, aperture block failure results in dark frames, not overexposed images.

Please keep on topic or the thread will be closed.

**photogem** · 10-28-2023, 02:12 AM

Originally posted by Sandy Hancock

Resurrected after a year of inactivity....

Member @Ryzard "resurrected" this thread 5 month ago. His last serious question before this one was Nov. 2022.

Originally posted by Sandy Hancock

.... and it now becomes another solenoid thread?

No but actually the opposite: A person asked about it and I answered accordingly, i.e. that it is NOT a solenoid problem and explained why.
Nothing wrong with this!

Originally posted by Sandy Hancock

As photogem said, this is NOT a solenoid issue as the K-5 series bodies do not have that component. On top of that, aperture block failure results in dark frames, not overexposed images.

This is not always the case:
If the magnet is too weak of the plunger too strongly modified the plunger will not hold anymore and thus overexposure will be the case!

Also: Aperture-block-failure can and does happen as well to the semi-prof. Pentax DSLRs using a stepper-motor, although this is quite rare.
If the stepper-motor stops working, it depends in which position it is stuck!
It either will produce dark frames OR overexposed images!

Originally posted by Sandy Hancock

Please keep on topic or the thread will be closed.

I really don't understand why my post would be off topic.
I just tried to explain the difference and help.

Anyway, I won't post in this thread anything concerning "a solenoid" anymore because everything is said now.
There was no intention to "turn a thread towards a solenoid discussion".

11-03-2022, 05:02 AM	#1
HArendsen New Member Join Date: Apr 2021 Posts: 7	First 4 images are overexposed How comes? Everytime I turn on my K-5II and I do some clicks the first 4 images are overexposed, nearly white. In RAW I cant do anything to make them better.

11-17-2022, 03:53 AM	#8
Ryszard Junior Member Join Date: Jan 2016 Location: Gdansk, PL Posts: 46	HArendsen - any new findings? I updated the firmware and re-set all possible settings, which wouldn't help at all. Then I took IPA to clean all connectors (lens, lens mount, battery and it's compartment). We'll see ;-) Last edited by Ryszard; 11-17-2022 at 05:10 AM.

05-31-2023, 11:30 AM	#10
Ryszard Junior Member Join Date: Jan 2016 Location: Gdansk, PL Posts: 46	I'm getting used to my issue. Checked carefully what's happening, here's the sequence: a) mirror flaps b) 2nd curtain closes c) 1st curtain opens d) mirror goes down, shutter is cocked and cures itself magically. From this moment it works properly. Tested in several modes, different lenses, high/low ambient temperatures etc. Just the initial exposure fails. Last edited by Ryszard; 05-31-2023 at 11:56 PM.

10-26-2023, 12:22 AM	#12
Ryszard Junior Member Join Date: Jan 2016 Location: Gdansk, PL Posts: 46	In my case? Definitely not. The K-5 has different aperture control mechanics. And I observed the shutter curtains behavior without the lens. It's the shutter, I'm sure. Last edited by Ryszard; 10-26-2023 at 10:05 PM.

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11-03-2022, 05:45 AM - 3 Likes	#2
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,888	Care to share a 5-6 frame sequence including camera exif data?

11-03-2022, 06:48 AM	#3
Ausable Senior Member Join Date: May 2019 Posts: 148	Originally posted by HArendsen How comes? Everytime I turn on my K-5II and I do some clicks the first 4 images are overexposed, nearly white. In RAW I cant do anything to make them better. Does this happen with all of your lenses or just one? I am wondering whether the problem might be caused by aperture blades sticking after a period of inaction.

11-03-2022, 08:31 AM	#4
FozzFoster Custom User Title Join Date: Jan 2016 Location: Alberta Photos: Albums Posts: 6,806	is your bracketing turned on? or exposure compensation?

11-04-2022, 08:28 AM	#5
Ryszard Junior Member Join Date: Jan 2016 Location: Gdansk, PL Posts: 46	Originally posted by HArendsen Everytime I turn on my K-5II Mine does 1st frame black after a week in the drawer. And it's not ABF, not an entry-level camera. I'll study my case and share information, assuming that I could ever find the root cause ;-) However, I'm going to check other lenses and clean all exposed electrical contacts. This should be good starting point. p.s. Camera acquired very recently, second hand, mint appearance and 70k clicks.

11-06-2022, 01:03 PM	#6
HArendsen New Member Join Date: Apr 2021 Posts: 7 Original Poster	Originally posted by Lowell Goudge Care to share a 5-6 frame sequence including camera exif data? I found something strange in the exif data. The first over exposed images there is no Exposure Program data...

11-06-2022, 02:17 PM	#7
Lowell Goudge Site Supporter Join Date: Jan 2007 Location: Toronto Photos: Gallery \| Albums Posts: 17,888	Originally posted by HArendsen I found something strange in the exif data. The first over exposed images there is no Exposure Program data... What does it show as the lens connected? It may be that no lens was detected through the data pin

11-23-2022, 06:12 AM	#9
HArendsen New Member Join Date: Apr 2021 Posts: 7 Original Poster	Still no clue. I can live with it, but it becomes ennoying.

10-25-2023, 06:51 AM	#11
scwinn New Member Join Date: Dec 2015 Location: Montreal Posts: 18	Could it be the onset of the dreaded aperture block problem??

10-28-2023, 01:24 AM	#13
photogem Site Supporter Join Date: Apr 2015 Posts: 3,520	Originally posted by scwinn Could it be the onset of the dreaded aperture block problem?? The dreaded ABF happens only to Pentax DSLRs since the K30 using a solenoid for aperture control. Also the two early semi-professional K10D and K20D used it as well, it was a different solenoid "made in Japan", while from the K30 up to the K-70/KF it is made in China. Only since Jan. 2021 onwards Ricoh finally solved it, so late K70's and the KF don't suffer the problem anymore. The problem wasn't Ricohs fault but the manufacturer in China used a cheap alloy which changed the magnetic characteristic of the alloy over the time. The solution was finally very simple, just a smaller permanent magnet was needed. From the K7/5 etc. (and KP and K-01 as well) Pentax used a stepper-motor for those instead of a solenoid, a more expensive and "larger" solution, but of course much better.

10-28-2023, 01:43 AM	#14
Sandy Hancock Moderator Site Supporter Join Date: Feb 2012 Location: Adelaide Hills, South Australia Photos: Gallery \| Albums Posts: 11,272	Resurrected after a year of inactivity and it now becomes another solenoid thread? As photogem said, this is NOT a solenoid issue as the K-5 series bodies do not have that component. On top of that, aperture block failure results in *dark* frames, not overexposed images. Please keep on topic or the thread will be closed.

10-28-2023, 02:12 AM	#15
photogem Site Supporter Join Date: Apr 2015 Posts: 3,520	Originally posted by Sandy Hancock Resurrected after a year of inactivity.... Member @Ryzard "resurrected" this thread 5 month ago. His last serious question before this one was Nov. 2022. Originally posted by Sandy Hancock .... and it now becomes another solenoid thread? No but actually the opposite: A person asked about it and I answered accordingly, i.e. that it is NOT a solenoid problem and explained why. Nothing wrong with this! Originally posted by Sandy Hancock As photogem said, this is NOT a solenoid issue as the K-5 series bodies do not have that component. On top of that, aperture block failure results in *dark* frames, not overexposed images. This is not always the case: If the magnet is too weak of the plunger too strongly modified the plunger will not hold anymore and thus overexposure will be the case! Also: Aperture-block-failure can and does happen as well to the semi-prof. Pentax DSLRs using a stepper-motor, although this is quite rare. If the stepper-motor stops working, it depends in which position it is stuck! It either will produce *dark* frames OR overexposed images! Originally posted by Sandy Hancock Please keep on topic or the thread will be closed. I really don't understand why my post would be off topic. I just tried to explain the difference and help. Anyway, I won't post in this thread anything concerning "a solenoid" anymore because everything is said now. There was no intention to "turn a thread towards a solenoid discussion".