6x6 scan - what are these lines?

Hi.

I just scanned this image the other day. 120 film (TMAX 100) taken with a Primoflex IV A (if that matters)

scanned with a Canoscan 8600F.

I have made a 100% crop of an area. What are those wavy lines? I've found them in more than one image

I've scanned. Are they from the developing process? Is the film not laying flat on the scanner?<div></div>

The wavy lines are called Newton's Rings. They are caused by inteference patterns in light reflecting back and forth between two reflective surfaces (the glass and film) in close proximity.

The solution is to use an holder that keeps the film a short distance from the glass bed. It may also work to place the emulsion side down and reverse the scan in software. The emulsion side is less reflective and film usually cups toward the emulsion side, keeping it out of close contact except at the edges. I take the latter approach using a glass holder in a Nikon LS-8000, and seldom have a problem with Newton's Rings.

If you do a close inspection of your scans you may find Newtons rings on other images. When film is in contact with glass you have the pontential to get Newtons rings in that area.

I built a film carrier for my Nikon 9000 that has anti-newton (AN) glass for both top and bottom glass and I never get Newtons rings. The AN glass I used has an etched surface on one side and this side is in contact with the film.

You can also wet mount the film and solve the Newtons ring problem. Wet mounting also reduces scratches, but it's a lot more trouble and messy. You need film carriers made for wet mounting to use this technique.

Wow, thanks for the detailed answers :^o

I believe I put the negatives in upside-down previous and the scanner said it couldn't find any

images. I guess I could try again ...

The surface irregularities in Anti Newton glass are what break up the interference waves. While these irregularities do work effectively against Newton Rings, they do so at a price: they degrade the image. To illustrate the point, putting AN glass in front of your camera lens would degrade the image; Why then put it in the path to the scanner's sensors? Fluid scanning also eliminates Newton rings but at no cost to the image, quite to the contrary it upgrades it. Fluid scanning (wet mounting) can be implemented with the scanner's standard carriers -requires no special carriers, and is quite a straight forward technique, that takes about 2 minutes / mount. It actually saves considerable time by eliminating altogether the need for ICE. Check on www.wetmounting.com.

Julio

www.scanscience.com