Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

> The real trick is exposure. Get to know your light source and always use
> the same distance between lamp and artwork.

I totally agree. I spent a great amount of time setting up the height and
exposure time of my system when I first put it together knowing it would
save me grief in the future. I wasted a lot of FR4 in the process, but found
the perfect time vs height for my system. Once there, I never had a problem
with exposure.
-Mike