After a few months since we got this 35mm vibrating adapter (with achromat) from Worley, JBQ and I tested it tonight. I am concerned about the extreme vignetting that I am getting. I can’t zoom in any more towards the ground glass because the HV20 wouldn’t focus that close, so I am not happy about that part. If you have any tips, I am all ears. I am wondering if I need a different ground glass.