I completely agree with this and see no reason to avoid FR4 as being somehow risky or failure-prone. It's easy to throw words like that around until you're the one responsible for making a product to spec and to cost, and then suddenly words like 'deburring' and 'anodising' give you nightmares.
Tracey -- the manufacturer explained this in an earlier post on this thread:
Shit happens.Hello, I believe Naomi has all ready spoken to you about this but I just wanted to personally apologise that you received a faulty lens board, they are supposed to have a rubberised light proof backing (similar material to our bellows) and the ones you received did not have the backing applied. I'm really sorry this wasn't spotted before they were sent out. We have been through all our current stock of lens boards and can confirm they are all light proof. We will have some replacement boards on the way to you tomorrow and more than happy to add in a box of film to make up for the lost sheets.
"Landscapes exist in the material world yet soar in the realms of the spirit..." Tsung Ping, 5th Century China
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