Pentax-DA* 55mm F1.4 Review
Image Quality: Chromatic Aberration
Chromatic aberration occurs because the lens is not focusing the different wavelengths onto the image sensor at the same point. The results are usually seen as a purple fringe on the image. The likelihood of chromatic aberration increases in high contrast situations and wide open aperture. To decrease the chances of chromatic aberration avoid high contrast situations if possible, if it is unavoidable then stop down your lens. Below are sample pictures taken with the Pentax DA* 55mm.
Verdict
The Pentax DA* 55mm had visible chromatic aberration at F1.4 but it did clear up once the lens was stopped down to F2.4. Fortunately, chromatic aberration can usually be corrected by software, such as Lightroom or DxO Optics Pro.
