SCOPE vs FLAT
There are two common types of 35mm film prints: scope and flat.
An image printed in scope looks thinner on the film itself compared to the way it looks projected in the theater. That is because anamorphic lenses were used while filming to squeeze the image during capture. Once it is projected in theaters, the image can be stretched with another anamorphic lens and projected extra wide onscreen in the intended aspect ratio: 2.40:1.
Flat uses black bars to preserve the intended aspect ratio of the film without the use of an anamorphic lens to stretch it.
When it comes to collecting, both have their benefits. A scope film image is significantly bigger to maximize the size of the image in each cell, but the image appears squished. A flat image is smaller on the film itself, but is not squished.
STRETCHED WITH ANAMORPHIC LENS