Scarpness adjust
To get to photographically good results, one focusing on the actual object always necessary unless you want to pursue an artistic effect. In macro photography, the sharpness and depth of focus range is often only a few millimeters. All the more so an accurate focusing is announced. Poor lighting conditions make it difficult to come here a precise way of working. In order to remedy this situation, I've tinkered a template that is made from the finest filigree lines, curves and lines on the basis of the Siemens star.
A template of a Siemens star can be viewed at the following link: http://oly-e.de/pdf/siemensstern.pdf