HOT PIXEL in my brandnew K5. WHO ELSE?

[pentx4life]

I got my new K5 today and before complaining about this issue, I want to say. STUNNING CAMERA. FAAST AF (compared to my K10D), great HighISO (again vs my k10D), and a completely new experience...

BUT..

I have 4 hot pixel in Video which do not go away with the Hot Pixel Mapping Function (did it a few times)

I made a Video, extracted 35frames with VLC-Player (Snapshot-function), stacked them in Photoshop CS5, converted them to a smart object, and set the stack mode to 'mean'.
Maybe you need to view the original filesize to see it good.

I took the Video with F 2.8, so it shouldn't be dust spots... and they are brighter than the background, so they are hot pixel.





Has anybody else made this experience? Or could someone try to do the same? Does that happen a lot?

What would you recommend to do? All suggestions welcome! I could send it back, but what if it doesn't get better with other K5s-cameras? ... hm...

I NEED a working camera until end the of dezember, because I want to get the 150€ from the Pentax-cashback... and fot that I need the bill.

Thank you!
Kevin

 

[MightyMike]

Well i found 1, but it seems to have vanished, i'm not worried about it
--
Mike from Canada

'I like to think so far outside the box that it would require a telephoto lens just to see the box!' ~ 'My Quote '



http://www.airliners.net/search/photo.search?sort_order=views%20DESC&first_this_page=0&page_limit=180&&emailsearch=mighty_mike88%40hotmail.com&thumbnails=

 

[falconeyes]

I can only see one in your image (at the top). Anyway, I believe a much easier test is to make a short video with the lens cap on and then extract a frame in-camera, ready to be zoomed in right in camera.

My K-5 has one hot pixel which becomes visible after a couple of minutes into straight video, when the sensor gets hot. My K-7 has one too. I think thats rather common and not to be worried about. I don't see my hot pixel in normal footage. I think all dSLRs suffer from this because pixel mapping doesn't work in video. I once returned my K-7 because of the single video hot pixel and received one with another one.

You may return your K-5 and receive one with either zero, one or two hot pixels. It's a game. Most people won't report about it because they never notice and don't care. I've still to see a Pentax HDSLR where this is a real issue. The D7000 seems to have a worse problem even visible in still imaging for some cameras.

 

[KitTP]

You may also want to check different photos taken under different conditions and different times to confirm whether you have an actual defective pixel.

Sometimes "hot pixels" are no longer visible after one or more camera On/Off cycles or under different lighting - those are more likely just quirks in the electronics or signal processing.

 

[pentx4life]

Thank you all for your reply!

My point is... it will be very easy to search and destroy ;-) a hot pixel in a jpg via PP... but it will be quite impossible for me to do the same in video.

The annoying thing is, that the position stays the same, in jpg, and in video. If I shoot with the lens cap on, that problem does not occur...

 

[sensingsys]

If I shoot with the lens cap on, that problem does not occur...

I think it is not a hot pixels problem.
http://www.imaging-resource.com/ARTS/HOT/HOT.HTM
Read towards the end of the page.

 

[pentx4life]

If I shoot with the lens cap on, that problem does not occur...

I think it is not a hot pixels problem.
http://www.imaging-resource.com/ARTS/HOT/HOT.HTM
Read towards the end of the page.

Thanks for that link, just read it and it seems, they describe that I should return my camera...

"But with exposures of a quarter second or less, hot pixels just shouldn't appear in your images. If they do, you've got a returnable product" (from the article)

and I think as Video framerate is 25fps, every picture of my video has a max. shutter time of 1/25... so ... damnit...

 

[gazonk]

You may return your K-5 and receive one with either zero, one or two hot pixels. It's a game.

I returned my W10 because it had a quite annoying hot pixel in video. 3 years later I started pixel-peeping the images I shot with the first Optio and discovered that the tele images weren't as soft as from the camera I kept (which I tend to avoid using at longest tele range), and concluded that the new camera I got had a slight decentering in the lens at maximum zoom.

Although I mostly use the camera only for family snapshots on the beach, and mostly at wide angles anyway, I still wish I hadn't been so obsessed by that video hot pixel
--
Espen

 

[Deleted1929]

They could be hot pixels, but in that case they'd appear on all frames - do they ?

If not they could be video artefacts - encoding and/or decoding.

We don't know what ISO this is at. Could just be a noise reduction artefact. I suspect performance consideration preclude running full NR on every video frame.

They could be a lot of things, but we don't know.

Are these noticeable without freezing frames and pixel peeping the result ?

--
StephenG

 

[pentx4life]

They could be hot pixels, but in that case they'd appear on all frames - do they ?
If not they could be video artefacts - encoding and/or decoding.

We don't know what ISO this is at. Could just be a noise reduction artefact. I > suspect performance consideration preclude running full NR on every video frame.
They could be a lot of things, but we don't know.
Are these noticeable without freezing frames and pixel peeping the result ?

I took a video and I suddenly saw one green glowing pixel. pretty bright, and then I was like ...whaat...?? and then I started to look closer in a 30s vid and I did discover 4 hot pixel which are always there. And once you see them you always see them... And for that much money I expect s.th. else. I want to make some 1080p shortfilms, or Band-Videos... and so that should be different.

They appear in all frames, especially visible in dark frames, and besides the video, I did discover one always red pixel in all shots, no matter what ISO-Setting (even with Iso 80, 1/500)... So I decided, I could live with hot-pixel in video, but NOT in stills. I did try the Pixel-mapping a few times, but it didn't solve the problem.

A friend of mine also got a new K5, and we only discovered 1 sometimes bright/hot-pixel in Video... so I still have hope... and I couldn't find one in stills, so it seems not to be a too typical problem with the K5.
Greetings! Kevin

 

[A Schamber]

I read a long time ago in LL that ALL cameras come with death pixels, because sensors usually have no less than 3 to 5.

Manufacturers map those pixels away, and everyone is happy, and anyone is making a big deal of it.

So... since the K20, Pentax cameras have the possibility to map those pixels yourself: hot or death ones. Why don't you just do that, and stop making a big deal of something that it is not?
--
Alan Schamber

Progress is not possible without deviation from the norm - Frank Zappa

 

[pentx4life]

So... since the K20, Pentax cameras have the possibility to map those pixels yourself: hot or death ones. Why don't you just do that, and stop making a big deal of something that it is not?

I DID do the Pixel-Mapping-Function about 10 times, and it did not change anything! I still have a small red dot on all pictures, in video, Raw or Jpg, NR enabled, or disabled... even in jpg with smaller resolution this thing gets integrated...

I would not post about s.th. like that if I could change it myself...!

I would be more than happy if I could do anything about it and NOT sending back my brandnew camera with which I was really satisfied and happy about. I am not a Troll, trying to make a big discussion about nothing!!

Best wishes
Kevin

 

[Philip Goh]

All my pixels are hot and together they make spectacular images

 

[A Schamber]

So... since the K20, Pentax cameras have the possibility to map those pixels yourself: hot or death ones. Why don't you just do that, and stop making a big deal of something that it is not?

I DID do the Pixel-Mapping-Function about 10 times, and it did not change anything! I still have a small red dot on all pictures, in video, Raw or Jpg, NR enabled, or disabled... even in jpg with smaller resolution this thing gets integrated...

Have you tried using RAW, and for example, Capture One? It masks them out.

I would not post about s.th. like that if I could change it myself...!

I would be more than happy if I could do anything about it and NOT sending back my brandnew camera with which I was really satisfied and happy about. I am not a Troll, trying to make a big discussion about nothing!!

I know you are not a troll... we all know it.
--
Alan Schamber

Progress is not possible without deviation from the norm - Frank Zappa

 

[GraniteShoppe]

I was afraid of this...Nikon is going through this with their D7000 (same sensor, but I'm sure you knew that). Some people have become obsessed with getting a perfect copy and are on their 4th one. Others live with stuck pixels in video mode because they rarley, if ever, will use the video mode and claim that DSLRs aren't made for video. They claim, "If you want video, get a camcorder." Not that I agree with that previous statement, but the video is kind of a marketing gimick for me personally.

I'd recommend doing a RAW shot at 3200 with the cap on and inspect for hot pixels. If you see any, send it back. If not, reevaluate your video needs. Most point and shoot cameras do video nowdays.

It would still be understandable if you decide to return it anyway as this is a huge investment. Good luck with whatever you choose.

 

[Bernard Delley]

I am keen to understand pixel mapping in the K5 for still images.
I would really appreciate if you could post (loss-less or uncompressed) raw
shots with lens cap on (black frames) and all noise reduction options off.
You could alternatively put them in ftp anonymous at
ftp.psi.chSI_incoming/delley

these 6 raw would give a systematic insight:
ISO... time1 time2
100 ..... 1/5..... 30s
800 .....1/40...... 4
6400 ..1/320... 1/2

If you have visible hot pixels, please activate the pixel mapping function after this first set. (how long does this take approximately? 1s 10s 1min)
Then please redo the test set of 6 raw black frames and post/ftp

I will tell what I can learn from the raw numbers.

PS: a K5 or K7 with many hours of air travel should be particularly interesting for this

 

[Two Hands]

I found this workaround some time ago on the net I copy and paste it.
maybe this works:

From Pentaxeros.com ¡¡Tu comunidad Pentax en español!! :
[Translation from Spanish]
----------------------

Well, I wanted to share this "discovery" with those who suffer this problem and hope to relieve headaches (mine sure) ...

I don't know if this method was described somewhere, but after searching everywhere I have not seen anything like explaining and solving this problem. but I'm really excited about this method and hope that it'll be fixed with a Pentax firmware.

After many tests, I found a / (the ?) solution, I smiled back and finally this allowed me to stay with my K-5 (which has not just one, but several hot pixels).

THE TRICK (not sloppy or messy):

1 • ... is, to NOT DIRECTLY BOOT with VIDEO MODE and shoot VIDEO!

2 • I mean, if you start up in VIDEO MODE choose a PHOTO MODE nearby on the dial, USER or Automatic (just for ease)

and ... VERY IMPORTANT! PRESS [LV] - Live View, to turn the LCD on. (No need to take pictures or anything else ..)

3 • Finally, with the dial, set up back to VIDEO MODE ... that's it !!! ... and record as long as you want, freely .. even in very low light ... the result is PERFECT! (In my case it is)

I think this activate the internal map of dead pixels (or hotpixels) as PHOTO, but in VIDEO MODE, really what the K-5 is supposed to do automatically in VIDEO. I guess Pentax will solve it by a firmware as it will be done soon by Nikon.

Why are there spots in the video I shoot with the D7000?

I hope this method can be useful to others and enables them to record videos with the K-5 without hot pixels.

I'm interested to know about your tests.

Read more at:

 

[Two Hands]

Mmmmm, Someting went wrong. Here's the tekst I found some time ago.
2nd trial:

Hot pixels in video k5

But I've found workaround to the Video HotPixels issue ... so here I give you the trick, translated by google from Spanish.

Well, I wanted to share this "discovery" with those who suffer this problem and hope to relieve headaches (mine sure) ...

I don't know if this method was described somewhere, but after searching everywhere I have not seen anything like explaining and solving this problem. but I'm really excited about this method and hope that it'll be fixed with a Pentax firmware.

After many tests, I found a / (the ?) solution, I smiled back and finally this allowed me to stay with my K-5 (which has not just one, but several hot pixels).

THE TRICK (not sloppy or messy):

1 • ... is, to NOT DIRECTLY BOOT with VIDEO MODE and shoot VIDEO!

2 • I mean, if you start up in VIDEO MODE choose a PHOTO MODE nearby on the dial, USER or Automatic (just for ease)

and ... VERY IMPORTANT! PRESS [LV] - Live View, to turn the LCD on. (No need to take pictures or anything else ..)

3 • Finally, with the dial, set up back to VIDEO MODE ... that's it !!! ... and record as long as you want, freely .. even in very low light ... the result is PERFECT! (In my case it is)

I think this activate the internal map of dead pixels (or hotpixels) as PHOTO, but in VIDEO MODE, really what the K-5 is supposed to do automatically in VIDEO. I guess Pentax will solve it by a firmware as it will be done soon by Nikon.

Why are there spots in the video I shoot with the D7000?

I hope this method can be useful to others and enables them to record videos with the K-5 without hot pixels.