Luminous Landscape Forum

Equipment & Techniques => Cameras, Lenses and Shooting gear => Topic started by: Letcher on June 04, 2006, 08:00:08 pm

Title: Moire patterns
Post by: Letcher on June 04, 2006, 08:00:08 pm

I use a Nikon Super Coolscan 8000 and am scanning a 2 1/4 x 2 1/4 Kodacolor neg. At 14 bit depth and super fine scanning, I get Moire patterns. I have flipped the neg in the scanner, but I still get the Moire stuff. The neg is held via two pieces of glass to keep the neg flat. But something is creating these patterns. Any suggestions?

Title: Moire patterns
Post by: dlashier on June 04, 2006, 11:37:54 pm

Newton rings? Did you use the spacers?

- DL

Title: Moire patterns
Post by: cmcnitt on June 05, 2006, 08:33:59 am

They are called newton rings.  There can be more than one per image.  Your scanner should've came with a film holder to keep the film from touching the glass. Drum scanners have that same problem.  That is why they use an oil to first coat the drum that that thin layer of oil helps reduce the amount of newton rings that show up.  If your scanner did not come with film holders, try using two, thin, black foam cores and cutting a hole in each.  Then, mount your negative inbetween the two and try rescanning.  Trust me, it'll work.  Just as long as the film is not touching the glass.

Title: Moire patterns
Post by: Letcher on June 13, 2006, 07:50:08 am

My scanner came with various masks for different sized images and I use them. That being said, I'll recheck to make sure that the film is in fact bing held off the glass.

Thanks.