Quote Originally Posted by Michael Slade View Post
Thanks Sandy. Should I worry about that slight patch of ND filter that is on the factory glass? I was thinking of putting a 5% patch there JIC...but wasn't sure if it was necessary.

Just ordered Arentz's new book. I look forward to reading your chapter.

Hi Michael,

The purpose of the ND patch is to even the light over the entire printing area so it would not be a bad idea to replicate the patch if feasible.

Many NuArc 26-1k(s) units don't have anything to even out the light. My Amergraph ULF-28 has nothing on the tempered glass, but there are patches on the reflector above the glass. I had a 26-1k in the past and it had nothing to even out the light, but the coverage was still excellent at about 20" circel.