The distance that the viewer is standing
from the lenticular display is referred to as the viewing distance
( which is a range ) and is the most important factor in determining
which screen ti use. There are two properties that determine the
useful viewing range of a lens; the thickness and the pitch
( number of lenses per inch ). The goal is to match the useful range
of the lens with the distance that the viewer will be standing away
from the display. A simple analogy is like trying to choose the
right golf club ( lens ) when you are at a particular distance from
the green ( viewing distance ). If two lenses both have the same
pitch, the thicker of the two will have a narrower viewing angle
and as a result will have a faster animation and deeper 3D. In other
words, the amount of perceived depth and the speed of the animation
can be optimized by selecting the proper lens.
The viewing distance for your particular
lenticular display is adjusted by making small adjustments to the
line screen output in the software program. For example, finer (
higher ) pitch output moves the viewing distance further away from
the display. An easy way to remember this correlation is Finer
for Further F for F, or if you prefer Coarser
for Closer C for C.
Other considerations in selecting
a lens are:
The finer the lens pitch, the harder
it is to register with the print. A finer pitch lens requires either
a higher resolution output or fewer images / flips. A narrow ( small
) angle lens ( 25 degrees or less ) will produce faster animation
however, this usually also reduces the number of frames that you
can effectively use.
There is an inverse relationship between
the pitch of the lens and the number of images / flips you can put
behind the lens for replay. A finer pitch lens requires a higher
resolution printer or fewer images / flips.
Lens direction / orientation:
You can orient your lens either horizontally
or vertically. The preferred orientation for animation is with the
lenticules running horizontal. For 3D effects the lenticules must
be vertical. Flips can run along either lenticule direction.