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Old Jul 13, 2006, 7:21 PM   #1
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Attached is a real size crop from my 75-300mm lens, top right corner. Here is the exif info:

1/200 at f/8, focal length: 300mm (35mm equiv is 450mm)

Its a nice and cheap lens to close up on far away objects but I'm wondering if that violet halo is real.

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Old Jul 13, 2006, 7:24 PM   #2
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And this is a shot from this lens at 75mm focal length.

f/11 at 1/250
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Old Jul 13, 2006, 9:37 PM   #3
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In my experience it is real, especiallyaround a white or light colored object. It will normally only happen at the long end and will be most evident if you view it at 100% crop. This is one of the reasons that I put it away as soon as I got my 70-210/4 beercan, I don't seem to get any with the Beercan. Just my $0.02

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Old Jul 17, 2006, 2:29 PM   #4
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As well as Photoshop, I also use Paint Shop Pro X. It has a fix for this. See screenshot below and the picture in that screenshot has the purple fringe removed. It's softened up some of the tarmac but you could create a mask around the person so it only adjusts the purple fringe in that area.




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Old Jul 17, 2006, 7:54 PM   #5
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it's called 'chromatic abberation'

that's why they make APO lenses (apochromatic)

if you're careful with the lens use you can get (out of camera):

KM 7D with 75-300mm f4.5-5.6 @ 300mm (450 equiv)

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Old Jul 17, 2006, 8:43 PM   #6
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Nice photo, Bernabeu!

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Old Jul 19, 2006, 8:12 PM   #7
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Gadzooks, that's one nice picture, Bernabeu!
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Old Jul 19, 2006, 9:39 PM   #8
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bernabeu wrote:
Quote:
it's called 'chromatic abberation'

that's why they make APO lenses (apochromatic)

if you're careful with the lens use you can get (out of camera):

KM 7D with 75-300mm f4.5-5.6 @ 300mm (450 equiv)
Nice photo... is that monofilament line I see attached to the wingtips??
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Old Jul 20, 2006, 3:49 AM   #9
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bernabeu, is your 75-300 the older "big beercan" design? I can't see any chromatic aberration on mine at full zoom.








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