I checked all 116 groups, but didn't see a pinhole related group besides "Zero Image Pinhole Camera Users" on this forum.
I checked just now again.
Am I missing something??
Could please direct me to this group? Or did you mean this forum we're posting/reading in right now?
And what is the difference between a Group and a Forum?
BTW: we can also be found on LinkedIn here: http://tinyurl.com/pinholegroup