LPR Conversion filter for 315mm Auroras

- for Aurora 315mm Conversion filter for Aurora flatfield-devices.
To be used when filters against light pollution like the Astronomik 
CLS oder CLS-CCD are installed in the camera. 
When you´re taking flatfield data with an Aurora you will notice
 that the histogram is looking quite strange: 
The peak of the red channel at the left, while blue and green are on the right side.
-The flatfield data can be quite difficult to process.

The LPR Conversion filter makes live much easier as the Histogram is boarder and the channels are closer together.