06-15-2011, 06:25 PM
[quote name='Brightcolours' timestamp='1308154027' post='9261']
When we make a photo of a page of paper with black numbers/letters totally in the plane of focus, we do not see such purple "bleeding" even when the lens is wide open. You simply have little understanding of what you are looking at.
[/quote]
It simply isn't bright enough to make the fringing obvious on the focal plane. I think I can come up with a quick and simple way to demonstrate that...
![[Image: loca1.jpg]](https://lh4.googleusercontent.com/-C6Fi5e6Rz_0/Tfj3DdFKA_I/AAAAAAAAGmk/_KCLbhKo5BU/s800/loca1.jpg)
![[Image: loca3.jpg]](https://lh4.googleusercontent.com/-GWdB7KYW4r8/Tfj3EAyHBQI/AAAAAAAAGms/zTS16KGX4Vg/s800/loca3.jpg)
Both shots taken using the Canon 85mm f/1.8 wide open. Right one is exposed about +3 stops compared to the left one by varying shutter time. Focus was manually set to make the line beginning "Earth" sharpest in the left shot, and was not touched again. Note in the higher exposed shot the onset of purple appearing on what was the best focus, and is even apparent on the line behind it.
When we make a photo of a page of paper with black numbers/letters totally in the plane of focus, we do not see such purple "bleeding" even when the lens is wide open. You simply have little understanding of what you are looking at.
[/quote]
It simply isn't bright enough to make the fringing obvious on the focal plane. I think I can come up with a quick and simple way to demonstrate that...
Both shots taken using the Canon 85mm f/1.8 wide open. Right one is exposed about +3 stops compared to the left one by varying shutter time. Focus was manually set to make the line beginning "Earth" sharpest in the left shot, and was not touched again. Note in the higher exposed shot the onset of purple appearing on what was the best focus, and is even apparent on the line behind it.
<a class="bbc_url" href="http://snowporing.deviantart.com/">dA</a> Canon 7D2, 7D, 5D2, 600D, 450D, 300D IR modified, 1D, EF-S 10-18, 15-85, EF 35/2, 85/1.8, 135/2, 70-300L, 100-400L, MP-E65, Zeiss 2/50, Sigma 150 macro, 120-300/2.8, Samyang 8mm fisheye, Olympus E-P1, Panasonic 20/1.7, Sony HX9V, Fuji X100.