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> [PIC-A-Day Thread] Post your daily shots here!, A Pictar A Day Keeps Da Fungus Away! XD~ (Photography)

PCHo
post Yesterday, 11:36 PM


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Noob here. blink.gif
Need some help analyzing this photo.
It seems there is a strange blueish glow on top of the lights in this photo.
Does anyone know what caused them and how to prevent them?

Model - Lumix LX3
Aperture - f/8
Shutter - 1/2
ISO - 200
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vincent_audio
post Yesterday, 11:45 PM


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QUOTE(PCHo @ Aug 28 2008, 11:36 PM)
» Click to show Spoiler - click again to hide... «


Noob here. blink.gif
Need some help analyzing this photo.
It seems there is a strange blueish glow on top of the lights in this photo.
Does anyone know what caused them and how to prevent them?

Model - Lumix LX3
Aperture - f/8
Shutter - 1/2
ISO - 200

*


I believe those are Chromatic Aberration. It's lens problem, but can be fix using adobe photoshop

This post has been edited by vincent_audio: Yesterday, 11:46 PM
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PCHo
post Yesterday, 11:58 PM


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QUOTE(vincent_audio @ Aug 28 2008, 11:45 PM)
I believe those are Chromatic Aberration. It's lens problem, but can be fix using adobe photoshop
*



Izzit?
I thought Chromatic Aberration was supposed to be related to subjects with bright backgrounds.
Is there something wrong with my lens or settings? blink.gif

And since you mentioned that photoshop is able to fix it, can give some tips on fixing them?
thanks notworthy.gif
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Wonka
post Today, 12:04 AM


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Camera Model - Sony Alpha A200
Lens - SAL75300
Aperture - f/5.6
Shutter Speed - 1/60
ISO - 400
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lwliam
post Today, 12:38 AM


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QUOTE(vincent_audio @ Aug 28 2008, 11:45 PM)
I believe those are Chromatic Aberration. It's lens problem, but can be fix using adobe photoshop
*




Chromatic Aberration is when different wavelengths (aka white light) from infinity does not get to focused entirely onto a single focal point after passing through the lens. This is caused due to different wavelengths travel at different speeds in a medium, which in this case, the lens.

What were observing here is flares bouncing off either:-

a) your UV filter (if its on, and its not a UMC) - but in your case, shouldnt be it...
b) your lens elements inside the lens.

it does not look like your regular lens flare coz now the light source is directly in front of you, and not out of the light path into the sensor.

i suggest to try move the camera around to eliminate/minimize the effect.

This post has been edited by lwliam: Today, 12:42 AM
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PCHo
post Today, 12:51 AM


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QUOTE(lwliam @ Aug 29 2008, 12:38 AM)
Chromatic Aberration is when different wavelengths (aka white light) from infinity does not get to focused entirely onto a single focal point after passing through the lens. This is caused due to different wavelengths travel at different speeds in a medium, which in this case, the lens.

What were observing here is flares bouncing off either:-

a) your UV filter (if its on, and its not a UMC) - but in your case, shouldnt be it...
b) your lens elements inside the lens.

it does not look like your regular lens flare coz now the light source is directly in front of you, and not out of the light path into the sensor.

i suggest to try move the camera around to eliminate/minimize the effect.
*




My LX3 doesn't have a UV filter.
The lens is a fixed Leica DC Vario Summicron.

I checked through the settings of my photos for the night.
And found that the blueish hue was due to the Aperture.
At the fastest aperture of f/2.0, there was no such blueish hue.
But at the slowest f/8.0, the blueish hue became very bad.
I was playing around with Aperture Priority mode, so there were quite a few samples for me to analyze.
As the aperture decreased, the blue hue became more apparent.

Is there something wrong with my lens?
The photo also shows that the upper left hand corner has this phenomenon, but not the background lights (as the lights move further away, there is no blue hue).

Is this some kind of lens defect? shocking.gif
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lwliam
post Today, 01:10 AM


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QUOTE(PCHo @ Aug 29 2008, 12:51 AM)
My LX3 doesn't have a UV filter.
The lens is a fixed Leica DC Vario Summicron.

I checked through the settings of my photos for the night.
And found that the blueish hue was due to the Aperture.
At the fastest aperture of f/2.0, there was no such blueish hue.
But at the slowest f/8.0, the blueish hue became very bad.
I was playing around with Aperture Priority mode, so there were quite a few samples for me to analyze.
As the aperture decreased, the blue hue became more apparent.

Is there something wrong with my lens?
The photo also shows that the upper left hand corner has this phenomenon, but not the background lights (as the lights move further away, there is no blue hue).

Is this some kind of lens defect?  shocking.gif
*




i know your lens doesnt have a UV filter, i was just giving case examples wink.gif

it could very well be diffraction, it happens more severely when your aperture is stopped down significantly. not exactly a defect, just some slight limitation.

i'd comment on your slow and fast aperture terminology, but i guess u probably know what ur trying to say anyway although its technically incorrect.

This post has been edited by lwliam: Today, 01:12 AM
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