Glass Scanning Without The Newton Rings

The Nikon Coolscan 9000ED scanner is an excellent scanner. The included holders are of a very good standard and many extremely useful and high quality optional holders are available. None of them, however, are cheap.

I have been scanning happily for many years with my Coolscan 9000 ED and never seen the need for glass scanning. For the most part I use high quality film that is not difficult to make lie flat and my only medium format camera until recently was a 6×4.5 model that I never used anything but Fuji and Kodak film in. Nevertheless I had ordered some glass insets some time back from Focal Point — mostly out of curiosity. In my limited testing the gains were modest and the extra effort significant so they mostly stayed in the box.

In the past six months my camera stable grew to include two medium format folders: the new Lomography X 6-12 6×12 camera and a beautiful German Agfa Record III 6×9 folder with the high quality Solinar lens. All of a sudden I was having significant challenges with film flatness. Try as I might I could not get the flatness I needed out of Nikon’s “tension” holder.

The product offered by Focal Point for the 9000 is a pair of glass inserts that fit in the standard FH-869S film holder. The standard way of doing this is to make a sandwhich with the AN glass on top facing the “shiny” side of the film and the standard glass on the bottom in contact with the emulsion side of the film. Since the shiny side is usually the side that has bad Newton Ring problems this is meant to work well. However, in my experience with the films I shoot (and maybe the climate I’m in) I often find that the emulsion side is smooth enough to give rings and I invariably only find these later when I’m editing. These problems disuaded me until my new cameras prodded me to solve the problem.

First of all, here is the standard Nikon FH-869S holder with the tension clamps removed:

2013-03-31 11.08.28

I have two pieces of the Focal Point glass. One plain and one AN. The AN glass has a sort of frosting on one side. You won’t see this by just looking at it but you can see it easily if you cause a bright light to be reflected by it.

Here is the shiny (plain) side:

Focal Point glass shiny side

Here is the “frosty” Anti-Newton side:

Focal Point glass AN side

It is hard to tell from these shots but both sides of the Focal Point glass look equally clear until you get a bright reflection bounced off them.

To scan without Newton Rings we are going to take advantage of the features of the AN glass and the Nikon holder. First step is to find the AN side of the glass and lay the glass down with the AN glass facing up. The second step is to lay the piece of film on the glass with the shiny side of the film facing the AN side of the glass:

Film on AN glass untaped

Next step is to carefully tape down one end of the film to the glass. Once the one end is taped down you need to place some tape on the other end and tape it down whilst applying tension along the length of the film. This tension will keep the film firmly against the glass in the middle although the sides will still curl away:

Film on AN glass taped down

You don’t have to worry about these edges because the next step is to place the glass in the holder with the film facing down. The film edges will now be held flat against the glass by the edges of the film holder:

Film and Glass in holder proud

The thing to watch for now is that the glass will only sit down flush in the “channel” in the holder if you carefully press it firmly and evenly down into the gap. It is a tight fit. It is a tight enough fit that you may or may not need to tape the assembly down. I usually tape it down just because if it does pop up you have to do your whole scan over again. Here is the same glass and film assembly properly pressed down. Note the edges of the glass versus the edges of the channel in the holder:

Film and glass in holder pressed down

There are a number of advantages to this way of doing it:

  • You avoid the Newton Rings that arise from the emulsion side sitting agains the plain glass at the bottom of a traditional glass “sandwhich”. These are the only kind I used to get
  • You avoid scanning through a layer of glass. The emulsion still faces the lens with nothing but air in between it and the scanner’s lens
  • You only have two extra surfaces contributing more dust to your scan verusus four extra surfaces when using both pieces
  • Setup and teardown is faster than when making and securing a glass sandwhich
  • Dealing with extremely curly films is much easier because you tape one end and then ┬átape down the other end using tension. It can be very hard to get a curly piece into a sandwhich

I hope this solution is useful for some other of you Nikon scanner owners out there. I do find the larger the piece of film the more objectionable the random soft areas from unflat film become.

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2 thoughts on “Glass Scanning Without The Newton Rings

  1. Pingback: How to Avoid Ugly Newton Rings When Doing Nikon Glass Scanning

  2. That’s an interesting solution.

    I have had some trouble with my Minolta Dimage Multi Pro; both bottom and top glass needed to be replaced due to a scratch in the center of the glass. I got new glass from Focal Point, and after a second batch (the first was to thick, but Focal Point was responsive very helpful and replaced it for free) scanning worked but I did often get Newton rings. Focal Point suggested to try yet another piece of glass… but today I tried something else instead.

    I made a new film holder out of some kind of compressed poly-coded board, and glued the clear glass from Focal Point onto it. Then I made a piece out of metal (bronze sheet… I just happed to have it) that looks much like the mask from a slide mount.

    Now I placed the negative onto the clear glass, and the bronze mask on top. To make it more secure, I taped down the mask, and then scanned.

    In other words… I am scanning without a top glass, and only a clear bottom glass. It worked surprisingly well. I noticed the negative was not lying perfectly flat, yet I cannot see any not-sharp parts in the final image.

    I just thought I throw this onto your page… maybe it helps someone else to test yet another scanning method.

    Cheers,
    DrTebi

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