Homebrew PCBs

>
>When I was calibrating my UV box (get a transmission step wedge, they're
>cheap and you'll know you're doing it right) I found that +- about 2-3
>steps would still come out usable. That works out to a 50% to 200%
>exposure.
>
>So there's a pretty big range of "works" with a smaller sweet spot in
>the middle that you should aim for.

Thanks, dj.
That means 100% overexposure-good news for me.
I work to use a Blu Ray module with my CNC PCB milling machine (CCD2 
made in Germany by Bungard).
Cristian