Hi, I just received a HOLGA HPL-OP lens, which I am using on a M4/3 camera. I am somewhat familiar with pinhole photography, but am confused a bit by what I found with this specific lens. Noting that the image quality was not exactly what I had anticipated, I investigated the both the objective and subjective surfaces of the lens. Not finding a 'pinhole', I encountered small diameter aperture...with what appears to be a clear lens or covering through which light passes. At least one surface of this clear lens/flat/etc is speckled with matte black paint. The speckle pattern is irregular to the extent that I do not believe that it is a feature of the lens (as in a zone plate or sieve). Is this the correct presentation of this lens, or is this a defect?