Blue around the edges? Anyone?
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What causes the blue around the edges. Is it a problem
with the camera, a Sony or the photographer? It happens a lot if the camera is pointed towards bright light? -- Cheers Wendy, who is a point & click on automatic, pic taker! No Spam Email Address Invalid |
Blue around the edges? Anyone?
This is a common photographic artifact, often called "Purple
Fringing", and it is usually caused by a technical effect called "Chromatic Aberration". CA is a function of the lens and according to Wikipedia, CA is caused by different wavelengths of light having slightly different focus points as they pass through the lens elements. High-tech (read; "expensive") lenses can minimize CA with special materials and construction, but this is one reason why two lenses of the same focal length can differ in cost by 2-3-times. Short of buying new super-duper lenses, Wikipedia says; Commonly advocated methods of avoiding purple fringing include: - avoid shooting with a wide-open lens in high contrast scenes; - avoid overexposing highlights (e.g., specular reflections and bright sky behind dark objects); - shoot with a Haze-2A or other strong UV-cut filter. Post-processing to remove purple fringing (or chromatic aberration in general) usually involves scaling the fringed colour channel, or subtracting some of a scaled version of the blue channel. JD On Sun, 26 Nov 2006 07:37:03 -0800, "wendy7" wrote: What causes the blue around the edges. Is it a problem with the camera, a Sony or the photographer? It happens a lot if the camera is pointed towards bright light? |
Blue around the edges? Anyone?
Thanks for the scoop John,
-- Cheers Wendy No Spam Email Address Invalid John - Pa. wrote: This is a common photographic artifact, often called "Purple Fringing", and it is usually caused by a technical effect called "Chromatic Aberration". CA is a function of the lens and according to Wikipedia, CA is caused by different wavelengths of light having slightly different focus points as they pass through the lens elements. High-tech (read; "expensive") lenses can minimize CA with special materials and construction, but this is one reason why two lenses of the same focal length can differ in cost by 2-3-times. Short of buying new super-duper lenses, Wikipedia says; Commonly advocated methods of avoiding purple fringing include: - avoid shooting with a wide-open lens in high contrast scenes; - avoid overexposing highlights (e.g., specular reflections and bright sky behind dark objects); - shoot with a Haze-2A or other strong UV-cut filter. Post-processing to remove purple fringing (or chromatic aberration in general) usually involves scaling the fringed colour channel, or subtracting some of a scaled version of the blue channel. JD On Sun, 26 Nov 2006 07:37:03 -0800, "wendy7" wrote: What causes the blue around the edges. Is it a problem with the camera, a Sony or the photographer? It happens a lot if the camera is pointed towards bright light? |
Blue around the edges? Anyone?
"wendy7" wrote in message
... What causes the blue around the edges. Is it a problem with the camera, a Sony or the photographer? It happens a lot if the camera is pointed towards bright light? It is the camera Wendy. You're not doing anything wrong. A better lens would cure it. Pat |
Blue around the edges? Anyone?
Thanks Pat, but after all it's a Carl Zeiss????
Going to try some filters. May just get another camera. -- Cheers Wendy No Spam Email Address Invalid Padraig wrote: "wendy7" wrote in message ... What causes the blue around the edges. Is it a problem with the camera, a Sony or the photographer? It happens a lot if the camera is pointed towards bright light? It is the camera Wendy. You're not doing anything wrong. A better lens would cure it. Pat |
Blue around the edges? Anyone?
"wendy7" wrote in message
... Thanks Pat, but after all it's a Carl Zeiss???? Going to try some filters. May just get another camera. Some Zeiss products are very good. A Carl Zeiss glass lens in a low or mid-priced point-'n-shoot would be more desirable than a plastic lens in one of the super cheapos, but don't expect too much from it when compared to lenses available on a DSLR. -- Paddy's pig ----------------- To reply it's bell not bull |
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