mshchem
Subscriber
Heliopan 318 brass adapter ring (Bay 60 to 67mm), as I'm sick of the cheap crap Chinese equivalent binding like crazy.
Been trying to find the 330 too (Bay 70 to 77mm), but it's proving very difficult. Might have to try and contact Heliopan directly to see if they have any NOS.
The best solution. I use these adapters worth the price!