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06-05-2014, 12:25 PM   #1
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Pentax K-5ii problem with blue color

Hi,

I just bought a new Pentax K-5ii with 18-135mm and tried to take some shots with the kit lens and the Tamron 90mm macro.

As you can see in the samples below (which are parts of the original images), there is strong blue "cast" at some spots. This blue light comes from the TV which was turned on.
Is this normal for the K-5? I had never such a problem with the K100D Super which I am still using.





The camera was at P and Auto program while taking the shots.

I hope this isn't a hardware problem. I had great expectations from the K-5 but I am very disappointed now

06-05-2014, 12:37 PM   #2
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QuoteOriginally posted by axel12p Quote
This blue light comes from the TV which was turned on.
Maybe I am over simplifying but are you not just picking up reflected blue light from the TV? Seems that is what I would expect to happen. The camera cannot just filter out the blue light because you don't want it there.

Try the shot with the TV off and see what happens.
06-05-2014, 12:42 PM   #3
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I'm not sure what you are expecting. These are photographs of shiny objects that show specular highlights and reflections of any light source in the room.

I would expect your K100D to show similar results with the same lens, same camera angle, and same light sources.
06-05-2014, 03:17 PM   #4
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Thanks for your replies!

I inderstand that I am picking up blue light from the TV, the problem is that the camera seems to boost the blue light.

Check for example the photo below




After your comments I' ve changed the custom image option from "Bright" (default) to "Natural" and tried again with both cameras and the Tamron lens.

The first photo is from the K100D (with boosted saturation and contrast settings) and the second one is from the K5.





Hopefully the "problem" hasn't been replicated this time.

I just want to be sure that there is no hardware problem, because the camera is brand new.

06-05-2014, 03:21 PM   #5
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Hmmm I do find it weird. Can you check tbe RGB values forthe blu parts? It looks as if the channel is completely saturated. Your tv (if LCD) is emmiting polarized light so you could try a polarizer to see if its just the tv or theres something wrong with the sensor
06-06-2014, 06:59 AM   #6
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How can I check the RGB values for the blue parts?

I don't believe that it has to do with the TV light, since the same happens with the blue leds from the laptop at the first photo of my previous post.

I will full charge the camera's battery and I will try to update to the latest firmware version. Now it has v.1.00 !!!???
06-06-2014, 07:23 AM   #7
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From what I can see, you're having exposure problems and forgetting that the K-5 has more dynamic range.. not to mention experiencing some issues with contrast... I can't tell from you examples... what the issue might be. For comparison purposes, you need to put the camera on a tripod, change lens and shoot exactly the same scene form the same location, and then reduce the images to the same size, in terms of pixel width. And you need to be shooting raw. If you aren't going to do with that, just fiddle with the K-5 settings until you find something you like. It won't work exactly like your K100D, but, it's not supposed to. What would be the point in the new camera if they worked exactly the same?

You've got so many uncontrolled variables, you don't know what is going on, and neither does anyone else.
06-24-2014, 06:05 AM   #8
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Reset your settings and try again.

07-07-2014, 08:05 PM   #9
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I read somewhere here in the forum that the problem appears when setting the camera to P mode.
07-07-2014, 08:28 PM - 1 Like   #10
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your TV doesn't happen to be a LED TV is it? LED lighting is well known for wreaking havoc with photography, the funny thing is that film handles it better than digital does.
07-08-2014, 12:33 AM   #11
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QuoteOriginally posted by Digitalis Quote
your TV doesn't happen to be a LED TV is it? LED lighting is well known for wreaking havoc with photography,
Indeed. It's a curse. Certainly worth looking into it's possible effects here.
07-15-2014, 08:22 AM   #12
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I have the same issue when I use my 35mm f2.8. The blues are boosted a little and look like some type of glow. It doesn't happen with my other lenses. I'm still investigating tough...
07-15-2014, 12:55 PM   #13
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The K-5 II and all Pentax cameras since the K-x, have an overly cool white balance (i.e. blue cast). The K100D Super and all Pentax cameras with CCD, have an overly warm white balance (i.e. yellow cast). Warm up the light temperature in the K-5 II photo, and cool the light temperature in the K100D, both will be closer to real life.

Here's a link to an experiment I did recently along the same lines. I warmed up the white balance of a K-3 photo until it looked like a K100D Super photo. No other changes:

https://picasaweb.google.com/100586096103361553535/CCDVsCMOS?authkey=Gv1sRgC...&noredirect=1#

Last edited by audiobomber; 07-15-2014 at 01:08 PM.
07-16-2014, 01:13 AM   #14
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In my case it is not a blue cast since the rest of the image looks OK, but a glowing blue halo around certain dark objects. It does not happen often though.
07-16-2014, 01:59 AM - 1 Like   #15
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this effect is what you get from lighting reflective subjects with a bright led light source. This isn't a problem with the camera/lens it is a lighting issue.



Pentax K5IIs - SMCP-FA77mm f/1.8 Limited @ f/4 ISO 80 10s

This is similar to the effect you are getting on specular reflections.

Last edited by Digitalis; 07-16-2014 at 08:23 AM.
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