You may have already heard of sample variation or decentered lenses. If you know how it works it will take you less than 5 minutes per lens! In this article we will show you how to easily test your lenses for proper centering. Similarly, it can be applied to a cameras optical resolution by taking photographs of a Siemens star printed at high resolution and comparing photographs from different cameras, to see which retained the center detail the closest. SVG format only please, not PDF nor any of the raster formats. It shows aliasing in the center, where the spokes are smaller than the pixel pitch. Preferably with solid bars, not sinusoidal. This test was published by the German Gletscherbruch homepage, but as this website is only available in German we decided to write an English version. Need a link to a downloadable Siemens Star Chart in SVG format But not the one in the Wikipedia article, it has too few spokes, looking for 144 cycles or 72 at a pinch.
This is the most important one: do not send us your shots and ask if we think your lens is okay.Move your camera on the ballhead until your target is in one of the extreme corners of the frame and take the shotĬhimney in upper right corner Chimney in lower left cornerīefore you rate your shots there are a few things to consider.You put your target in the center of the frame and you focus on it.įocus is on the chimney in the center of the frame.electronic first curtain shutter off (if you have a stable tripod).use the widest aperture of your lens (some lenses have very bad corner performance, stop these down until there is visible detail in the corners).Some building far away (chimney, antenna, church tower etc.).
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