The following tips are designed
for theaters who have a sharp focus on their flat (1.85x1) films but NOT
on their scope (2.35x1) films.
*A loop of SMPTE 35PA test film as pictured above. If you have
a loop of the older "RP40" test film, that will work fine also. To
properly focus an anamorphic you will need a loop of this. SMPTE
can be contacted at 914/761-1100.
*About 5 minutes of your time.
NOTE: If your theater cannot focus sharply on flat films, do
not bother with this adjustment as there is something else in your theater's
equipment out of alignment. Contact your engineer. This tip
was posted here due to several inquiries about poor focusing on scope films
1. Thread the loop of PA35 test film into the projector, making sure
the loop does not hang in front of the lens. Depending on the particular
anamorphic you are using, you may have a small thumbscrew, set screw, or
a ring collar at the front of the lens. Loosen the locking mechanism
so that you can freely turn the outer focusing ring (labeled with measurements,
commonly from 20 feet to 150 feet). Note the current setting before
changing it for reference.
2. Turn the focusing ring all the way down as low as you can go (about
20 feet). If you are in a short throw theater, such as a screening
room, you might be better off turning it to it's infinite setting (typically
3. Turn the projector and lamp on. Notice the image will be incredibly
blurry. Use the projector's focus control to focus the horizontal
lines on screen to be as sharp as possible. Ignore all vertical lines.
Once you get the projector's focus set in this manner, do NOT touch it
again for the rest of this process.
4. CAREFULLY and slowly, turn the focusing ring on the anamorphic lens
itself. Continue to turn it until the vertical lines converge and
become as sharp as possible. Again, ignore all horizontal lines.
5. Now, without bumping the focus setting on the anamorphic, tighten
the locking mechanism.
Your lens is now optimized for your projection throw. Because
this method is accomplished by focusing through the lens as opposed to
counting the distance from lens to screen (commonly by counting ceiling
tiles), your end result will be a sharper image.