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High contrast purple fringing.

xinia 13 54
23 Jan 2006 9:55AM
Just wondering how much purple fringing is due to the camera or lens. Have noticed it with the nikon d70 and the kit lens(now deceased) and also with the recent purchase of the fairly 'basic' sigma 18-200mm lens. Not being able to try it out with top top lenses just wondered if the prob. would cease to be so if using them? Any thoughts ???

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aftertherain 13 4.2k 2 United Kingdom
23 Jan 2006 11:06AM
I use the Nikon D70 with the 18-70 & 28-200 lens and I only get fringing if I seriously oversharpen my images in PS.
u08mcb 14 5.8k
23 Jan 2006 11:16AM
Purple fringing is a fault associated with the lens and cannot be caused by sharpening in PS.
martyn_b 12 20 1
23 Jan 2006 11:21AM
i too get purple fringing sometimes,70-300nikon DG lens with the D70S a friend said you should be able to alter it in the settings but i havent found out how yet, cheers martyn
User_Removed 14 17.9k 8 Norway
23 Jan 2006 11:29AM
Agree with Merl's comments when it comes to the 18-70mm... and I have to disagree slightly Malcolm. Sharpening will exacerbate the problem. In this full size image, the radiator had a hint of 'PF in the top, left portion. Sharpening made the PF worse. (File size was 72Mb...)
takui neko 14 849 11 Spain
23 Jan 2006 11:33AM
Exacerbate yes, cause it, no. Smile
u08mcb 14 5.8k
23 Jan 2006 11:34AM
oversharpening anything will make it look rubbish but i challenge you to provide evidence that sharpening can actually cause purple fringing to increase.
loweskid 16 2.0k 1 United Kingdom
23 Jan 2006 11:56AM

Quote:Not being able to try it out with top lenses just wondered if the prob. would cease to be so if using them?

Not necessarily. One reason (apart from cost) I bought the Sigma 12-24 in preference to the Nikon was less chromatic aberration. Someone on dpreview had managed to borrow both lenses for a day and took a lot of comparison shots.

If you are shooting in raw and using the Adobe Camera Raw plug-in for Photoshop there are two sliders where you can adjust the amount of fringing.
xinia 13 54
24 Jan 2006 1:35AM
thanks - Vincent thats an interesting point about shooting in Raw...... and being able to adjust the PF.

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