I have narrowed my choices to 36cm Heliar. For those users there, is there much difference between a Heliar and a Universal Heliar? I am asking this question because I can get a uncoated 36cm Heliar in barrel for about $300 and the only 36cm Universal Heliar I can find is asking for 1k more. Next question: Is it possible to put a 36cm Heliar into a conpound 5 shutter? Or better to use a Packard shutter. Thanks.