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12-22-2015, 11:32 AM   #1
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Pentax k3 bulb mode problem

Hi all

I seem to be having a problem with my bulb mode on my pentax k3. Last week it seemed to be working fine but every now and then it behaves strangely

I tried testing with my O gps on and off but for some reason it always just take a exposure of 1/25 sec. I tried with and without the pentax cable release and even changed the bulb behavior in the menu to mode 2 but still no luck. I can see the exposure is only 1/25 and it is not a total dark frame.

Can anyone please help.

Please also feel free to ask for more info.

12-22-2015, 11:47 AM   #2
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QuoteOriginally posted by johan kruger Quote
Hi all

I seem to be having a problem with my bulb mode on my pentax k3. Last week it seemed to be working fine but every now and then it behaves strangely

I tried testing with my O gps on and off but for some reason it always just take a exposure of 1/25 sec. I tried with and without the pentax cable release and even changed the bulb behavior in the menu to mode 2 but still no luck. I can see the exposure is only 1/25 and it is not a total dark frame.

Can anyone please help.

Please also feel free to ask for more info.
So, you are holding the shutter down and it just stops and flips the mirror back up after 1/25 second while you are still holding it down?
12-22-2015, 11:53 AM   #3
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QuoteOriginally posted by johan kruger Quote
Hi all

I seem to be having a problem with my bulb mode on my pentax k3. Last week it seemed to be working fine but every now and then it behaves strangely

I tried testing with my O gps on and off but for some reason it always just take a exposure of 1/25 sec. I tried with and without the pentax cable release and even changed the bulb behavior in the menu to mode 2 but still no luck. I can see the exposure is only 1/25 and it is not a total dark frame.

Can anyone please help.

Please also feel free to ask for more info.
Hello, the bulb mode with GPS, has 2 positions.
1 Bulb
2 ASTROTRACER
Go to the menu GPS ASTROTRACER
12-22-2015, 12:40 PM   #4
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It is even Stranger. I for example hold down the shutter either by hand or cable release. It sounds like it makes a shutter sound. I then hold for 1 min and release and it makes a shutter sound but exposure was only 1/25 when you look at photo. All noise reduction is off. Battery was more than half full.

As said I tried with O gps powered on and off

12-22-2015, 12:56 PM   #5
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How do you know it is 1/25 s ? Do you see it in the EXIF or by judging from the brightness of the image?

Try with the lower manual speeds such as 1 or 4 seconds. Do you get the correct exposure then or still the 1/25?

What I suspect is a faulty latch for the second curtain. If so the slow manual speeds will also not work. If the slow manual speeds work correctly then it is almost certainly a firmware problem and might be fixed with a factory reset and perhaps a firmware upgrade if you are not already on the latest.
12-22-2015, 01:04 PM   #6
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Thanks lister. I see from the exif that it is 1/25 but you can see it in the exposure as well. In manual mode exposure up to 30 sec does still work. Also as said some days it works and some it does not. I will try and update the firmware then. It is still the original firmware.
12-22-2015, 02:08 PM   #7
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When in Astrotracer mode, the O-GPS1 takes over shutter operation and the shutter is controlled by the unit. Is this happening in Astrotracer or gps mode?
12-23-2015, 12:01 AM   #8
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Try resetting the camera (menu).
Remove the battery for a night.

When you look into the camera (with no lens) you should see the sensor open.
If it's only 1/25 s you should see the sensor closed.

12-25-2015, 03:38 PM   #9
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Hi

I have updated the firmware and it is still not working.

I have tested without a lens in manual I can set it all the way to 30 second and the shutter does open and it exposes as normal.

When I put it in bulb mode and look at the sensor it only opened very fast and expose for 1/25 of a second no matter how long you hold the shutter.

This is very strange. Maybe I should try keeping the battery outside for a day.

Regards jk
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