I've heard that sandwiching filters in a Panavision ARF can
generate strange Newton Rings. I once worked for a 1st AC
who had us apply camera tape to the corners of each filter
before placing it into the ARF (to put a slight distance between
layers of glass).
Any truth to this?
Eric D. Anderson
Assistant Camera / Los Angeles
Newton rings are a possibility but I've only seen it once
in 35 years.
Most of my two hundred plus filters are taped on the edges to guard against this and, more importantly, it keeps the edges and corners form being chipped.
1st AC/ Los Angeles
>I've heard that sandwiching
filters in a Panavision ARF can generate >strange Newton Rings.
I have had to stack three Tiffen filters into two Arri trays many times. I have never experienced problems with Newtons rings.
What is a Newton ring?
It is an optical interference band pattern in the form of
irregular concentric rings of coloured light, which happens
when there is an imperfect contact between two flat transparent
surfaces and the separation between them is in the order of
the wavelength of the light passing through them.
Arturo Briones-Carcaré (still alive and being kicked)
Madrid (Imperial - but starting to recivilise - Spain)
Newtons Rings :
EI Customer Technical Services
Eastman Kodak Company