Quote Originally Posted by dperez View Post
I have been using it with color negative films. I've recently used the filter with Ektar 100 8x10 at Shell Beach, CA. I will post my results as soon as I process the negs.

-DP
You just addressed my next group of questions. I don't have any reciprocity charts for color negative films. I'm using Kodak Portra NC & VC 160. Does anyone have some "starting points" for long exposures? I hate to run a batch of C41 with perfectly good film just to get to a starting point that someone may already be able to share. I'm also wondering how far you can go with long exposure before color casting gets to be too much of a problem for filter corrections during printing.

My corrections for Delta 100 are based on 1.15567 X i^1.4379. That's a good starting point. It's produced a very workable negative every time.

I look forward to seeing your examples dperez.