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05-17-2013, 04:15 AM   #16
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Those examples aren't comparable. I have a RX100 and it struggles mightily with LEDs, this is not a pentax specific issue.

05-17-2013, 04:26 AM   #17
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QuoteOriginally posted by incidentflux Quote
Sorry but I see the same blue in your Sony shots. Also the K5 shot looks like ISo was VERY high and that may be contributing to what you are seeing there. To do a fair comparison you would have to take the same scene with same settings not 2 randomn totally different scenes and set ups.
05-17-2013, 06:12 AM   #18
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As long as you leave the JPEG image setting at an unmodified "Bright", colors will be prone to over-saturation. Suggest you either go -1 Saturation in Bright or switch to Neutral and then do the evaluation.
05-17-2013, 06:41 AM   #19
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Here is another beautiful test shot of my office coffee pot

This is a K-30 in TAv mode with a shoe mounted 56 LED panel and the 18-135 lens. Distance was about 4 feet / 122cm. Ambient room light was very low. The RAW file was opened in Photoshop Elements 11 for conversion to JPG, then the JPG opened in Microsoft Office Picture Manager solely to knock the size down to 1024X768. No adjustments were done to exposure or tonality. Other than it is obvious why I rarely use this panel for this type of photography, I see no overtly blue cast on anything - including the white trim on my office door.

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05-17-2013, 06:58 AM - 1 Like   #20
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Jim there are leds and leds

This what standard led looks like for normal light.


As you can see a peak in the blue and little bit of other colours so it's not nice for colours when photographing or filming.
Leds for professional lighting for video and photography are often more balanced and have a wider spectrum of colours. Thats why you easily pay thousands of dollars sometime for such panels, it's the quality of the light.
05-17-2013, 10:27 AM   #21
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QuoteOriginally posted by twitch Quote
Those examples aren't comparable. I have a RX100 and it struggles mightily with LEDs, this is not a pentax specific issue.
The common factor being Sony sensors.
05-17-2013, 12:10 PM   #22
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QuoteOriginally posted by Anvh Quote
Jim there are leds and leds

This what standard led looks like for normal light.


As you can see a peak in the blue and little bit of other colours so it's not nice for colours when photographing or filming.
Leds for professional lighting for video and photography are often more balanced and have a wider spectrum of colours. Thats why you easily pay thousands of dollars sometime for such panels, it's the quality of the light.
+1

I sometimes draft the 5000k LED bulb in my desk lamp for lighting purposes. It casts a wonderful effect. It doesn't mean when I shoot a blue LED someone is using for a sign or whatever that it won't look horrible. Heres a shot of a local restaurant with LEDs in the windows. This is unedited, straight OOC as the K-30 processed it.




EDIT: A quick search on flickr for "LED lighting problems" led to this guy's blog talking about it - and he shoots Canon
http://redfishingboat.com/2012/02/led-problems-in-concert-photography/

Last edited by Sagitta; 05-17-2013 at 12:17 PM.
05-17-2013, 12:19 PM   #23
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QuoteOriginally posted by incidentflux Quote
Your RX-100's first shot shows white where the blue LEDs are. It's not efficiently handled.

For everyone else - clicking the linked thread about the k-5 being over sensitive should answer some questions. it's a problem for all sensors, not just Pentax.

05-17-2013, 10:50 PM   #24
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QuoteOriginally posted by JinDesu Quote
Your RX-100's first shot shows white where the blue LEDs are. It's not efficiently handled.

For everyone else - clicking the linked thread about the k-5 being over sensitive should answer some questions. it's a problem for all sensors, not just Pentax.
You're right, but the blue bleeding isn't that pronounced. At this point and I'm well and truly entrenched with Pentax with all the lenses I bought. However I did a search with the Nikon D7000 and couldn't find any threads like these. So something's a miss here.

Can someone please post some more samples if they can?

Last edited by incidentflux; 05-18-2013 at 01:40 PM.
05-18-2013, 07:11 AM   #25
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QuoteOriginally posted by incidentflux Quote
You're right, but the blue bleeding isn't that pronounced. At this point and I'm well and truly entrenched with Pentax with all the lenses I bought. However I did a search if the Nikon D7000 and couldn't any threads like these. So something's a miss here.

Can someone please post some more samples if they can?
First of it is not possible to get proper comparisons how one camera versus another handles a situation unless you perform the evaluation at the same time under identical conditions. There are so many things that effect results that otherwise could change the the results. Many of the samples that we have seen have been at high ISO and relatively long exposure and probably hand help. Also as someone said photographing lights at night is a unique experience with its own set of difficulties. Blue in itself presents issues and again especially when there are heavy shadows which in themselves move things toward the blue end. I have spent a bit of time looking for pictures on the web of leds and I couldn,t find one that didn't have some bleeding of blue LED's. This is not a Pentax issue but rather a subject issue just as shooting snow scenes is a subject issue that needs to be dealt with.
05-18-2013, 07:17 AM   #26
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QuoteOriginally posted by incidentflux Quote
You're right, but the blue bleeding isn't that pronounced. At this point and I'm well and truly entrenched with Pentax with all the lenses I bought. However I did a search if the Nikon D7000 and couldn't any threads like these. So something's a miss here.

Can someone please post some more samples if they can?
It's not a Pentax issue, its a Bayer filter issue. Any sensor with a Bayer filter is going to show this. LEDS don't use the green wavelength for light, which means the standard Bayer filter is not going to recieve about half the data it should when shooting an LED. It will get pure red and/or blue, with almost no shadow qualities involved causing that wonkiness.

Bayer filters are pretty much used by *everybody* so any claims of superiority of one brand over another is baseless unless they're using a different filter system entirely.

I'd be curious to see how a K5II would work on LEDs, actually.
05-18-2013, 11:20 AM   #27
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QuoteOriginally posted by Sagitta Quote
It's not a Pentax issue, its a Bayer filter issue. Any sensor with a Bayer filter is going to show this. LEDS don't use the green wavelength for light, which means the standard Bayer filter is not going to recieve about half the data it should when shooting an LED. It will get pure red and/or blue, with almost no shadow qualities involved causing that wonkiness.

Bayer filters are pretty much used by *everybody* so any claims of superiority of one brand over another is baseless unless they're using a different filter system entirely.

I'd be curious to see how a K5II would work on LEDs, actually.
Hey, there's Sigma cameras around!
05-18-2013, 12:20 PM - 1 Like   #28
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We could wait for a debayered KIIx or diy...

Not for the faint of heart
https://www.google.ae/search?safe=off&q=debayering+a+dslr+&oq=debayering+a+d...rp.uT9Bop1GD70
05-18-2013, 01:02 PM   #29
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QuoteOriginally posted by incidentflux Quote
We could wait for a debayered KIIx or diy...

Not for the faint of heart
https://www.google.ae/search?safe=off&q=debayering+a+dslr+&oq=debayering+a+d...rp.uT9Bop1GD70
Really cool link!
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