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09-22-2013, 05:54 PM   #1
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What do suppose caused this?

I bought a K01 to use on a weather balloon flight for interval shooting. I tested the camera before hand on the ground twice and managed to get hours of photos. I had a 28mm manual focus lens on it. It took great shots once in the air, but after 65 minutes all of the remaining photos look like the one I've attached. The camera was in a heated space. I'd be surprised if it was the cold, though, since I've used many different lithium powered cameras in the past and have never encountered anything like this.

Does anybody know what this is symptomatic of?

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09-22-2013, 06:23 PM   #2
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Is it still producing shots like these? If so, maybe the sensor or electronics was damaged? A heavy shock, or perhaps some form of radiation (although I don't think your cam would be high enough to be affected by radiation...)?
09-22-2013, 06:39 PM   #3
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Do you know what the internal temperature of the space was?
and was the outer side of the lens exposed to near space (allowing the heat to escape)?

I've never seen a purple spot like that before.

at 64 minutes flight time, the outside would be about as cold as it gets ~-40 degrees.
electronics aren't designed to work at those temperatures, perhaps the sensor was doing some weird temperature dependant thing despite the heater.

if it's OK on the ground, maybe send it up again and see if the problem repeats itself?

I'm sorry I can't be more help. I'd be interested to know if you find the cause.
09-22-2013, 07:04 PM   #4
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The altitude look incredibly high. There is a thing called outgassing that happens when you take away the atmosphere. Maybe the something separated on the sensor like the alias filter or the bayer fllter??? Just guessing.

09-22-2013, 07:07 PM   #5
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Well, you can see from the attached photo that the quality image the K01 was producing was quite good before it crapped out. The balloon was not that high 65 minutes in, relatively speaking. It topped out at 100,000 to 105,000 feet. It took pics the whole 3 hour flight, but after 65 minutes they all looked screwed up like that. Perhaps it was the cold (I didn't have a temp logger), but I wish I had a technical explanation so i knew what to do next time! I thought I had found the perfect camera for my balloon flights, long battery life, interchangeable SLR lenses, built-in intervalometer, huge sensor. It was a real disappointment.
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PENTAX K-01  Photo 

Last edited by joflaig; 09-22-2013 at 08:44 PM.
09-22-2013, 07:09 PM   #6
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OH, and I just tried the camera and it works fine. Perhaps that is telling.
09-22-2013, 07:16 PM   #7
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That looks like nearly magenta which would be zero on green channel and some positive values on red and blue.
Is it possibly the spot on the sensor was overloaded or even damaged by the sun?

Edit> Well you are fortunate it is still ok, maybe just overload?
09-22-2013, 07:50 PM   #8
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If the camera was heated and the optic was cold--perhaps there is some lubricant/fluid evaporating and then depositing on the colder glass. This would also be consistent with initially no problems/it developing over time. Do the pictures show the area growing from nothing outwards (assuming the time between shots isn't very long)? Also if this is the case (on the glass) the area should likely be very diffuse--or does it have a defined border (from the picture it seems to have a somewhat defined border/pixels).

09-22-2013, 08:18 PM   #9
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Camera temperature, according to the EXIF, was 14 degrees C, which is cool, but certainly not freezing.

This does look like a read noise issue with the sensor, as I understand it. First time I've seen anything precisely like that with the K-01/K-5 however. I have encountered purple patches of a different kind before on my K200D when doing longish exposures though.
09-22-2013, 08:48 PM   #10
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Here's another psychedelic example.
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09-22-2013, 09:22 PM   #11
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Oh my goodness, 100,000 ft?! No way the camera was at 14deg C lol. the atmospheric lapse rate is 2deg/1000ft. It was probably very much below -20degC up there. The camera was also well above most of the atmosphere that protects us from UVA and UVB radiation. I would say the purple colour is an effect from the excessive amounts of UV light, whether it is related to the cold or not I can't say.
09-22-2013, 09:30 PM   #12
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Your 2nd example looks a bit like newton rings. It would likely be condensation (outgassing then condensing) and it appears to be on the sensor.
09-22-2013, 09:36 PM   #13
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One other thing. Maybe the K-01 sensor is more responsive to UV/other effects. Based on 2nd picture (and 1st) and the differences--it may be real sensor response (to light spectrum above ozone affect?).
09-22-2013, 10:39 PM   #14
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2nd freaky space shot also reads 14 degrees C camera body temperature.
Sunset over the clouds shot shot reveals 21 degrees C, so the temperature sensor was working all the way up.

How does the camera work if you lower the temperature (in the refridgerator maybe) to about 14 degrees C and shoot it into a bright light?

Last edited by rawr; 09-22-2013 at 10:45 PM.
09-23-2013, 02:12 AM   #15
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It's almost as if something is "burning" the sensor and spreading.
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