1. The effective aperture is reduced by vignetting at angles above ?0? 2. :Normally I'd expect vignetting to be the issue. 3. This vignetting became a trademark of his work in publication. 4. Vignetting is often an unintended and undesired effect caused by camera settings or lens limitations.5. All DA lenses can be mounted on Pentax film bodies, albeit with increased vignetting . 6. Vignetting , barrel distortion and chromatic aberration are also problems that are difficult to eradicate.7. This can lead to pixel vignetting . 8. Such lenses will give noticeable vignetting if used on a 35mm film or full frame sensor cameras. 9. At fast aperture sizes ( up to f = 2.8 ) there is visible vignetting . 10. However, many PC lenses require a small aperture setting to prevent vignetting when significant shifts are employed.
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