NEWTON'S RINGS.

byTed Peterson
A frequently asked question is why do these colored rings show up on my glass mounted slides? Well now you will know.
Most manuals don't cover this information as most photographers will not let these distract them.
These rings are not noticed until after the picture is on the screen or a print is made. These rings, when printed, show up as areas of either lighter or darker in density than adjacent affected areas. On slide shows they will show up on the screen as light colors rings or spots. Some times if you look at the picture straight, no rings will show but if you look at it from an angle they will show up.
Newton's rings may not be rings. What they look like is the pictures you see when you are working with soap bubbles or when you see a film of oil on water.
You can also see it when you have a piece of film between 2 sections of glass and you place pressure on the glass and when looking at the picture in your hand you will see the rings on the glass.
The way to keep from getting Newton's rings is to use glassless negative carriers, or mount your slides without glass. You can also use glass by the use of a very fine dusting power passed over the film and then adding the glass. This will keep the glass from touching the film.
Most lens for cameras have a coating on them to keep the lens from showing the rings. Most glass will at some time show them.
One thing that you can do to keep from having Newton's rings is to keep from using films in high humidity. The higher the humidity the more likely for them to show up.
You can take some good pictures by taking pictures of Newton's rings. There have been award winning pictures in some contests. Try them.
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