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Correcting Chromatic Aberration MUCH More Easily

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rconn

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I have been engaged in adding a set of 'Develop Presets' for my "Pet" lens (Pentax DA* 16-5'mm f/2.8 on a K1'D ) which is very sharp but like most wide range zooms it has some varying Chromatic Aberration (CA) in the corners, especially wide open.

I have taken a series of shots of some eucalypts at a set of focal lengths at one stop steps at each of these focal length settings. I then correct for CA in Lightroom and save just the CA slider settings under focal length + aperture titles. These enable me to instantly almost completely fix new images just by applying the nearest matching preset.

The only problem is getting the optimum correction, working with the foliage, due to some purple fringing and interaction of the colour fringes in the two sliders (viewing at 2''%).

In the Planet Photoshop site tips list I discovered this, http://www.planetphotoshop.com/slide-away-the-aberrations.html re correction in Photoshop Camera RAW which also applies to Lightroom
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Edited for Lightroom it comes out as,

If you see areas of bright-colored fringe appearing around corner objects in your photos, you’re suffering from Chromatic Aberration.

Under Lens Correction in Develop, there are two sliders (Red/Cyan and Blue/Yellow) that you let you slide those problems away. But seeing the problem clearly enough to eliminate the fringe is your first challenge.

That’s why you’ll want to know this tip: If you hold the Option key (PC: Alt key) while you’re dragging either Chromatic Aberration slider, it will only show the two channels you’re adjusting in the preview area, making it VERY much easier to see the fringing, and thus repair the problem.


Especially when you are working as I am at 2''% magnification this tip works superbly well and I strongly commend it
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Rod
 
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