Filmo movie projector lenses User manual

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Lenses and their use





 l3&II projection lenses, Jor both 8mm and-16mm.-projectors,
cn,,er a wide rary1e oJ Joca'I lengths. AII arc Filmocoted,  toncrmit nassaoe of the marimum i.Llnmination   f or screen'pi    r I ures'oJ o rio   t er'  l, r i!  I ian r'e an'l  r  I n r  i | 11.

1.\NE of the most important features of your
\J   pitroo sound or silent projector is the inslant
interchangeability of projection lenses. Practically
any desired screen picture size may be obtained by
the use of a lens of the proper focal length. Select
the correct lens for your use from the chart on the
following page.
  For best projection resulLs, the screened picture
should be neither too small nor too large to be seen
comfortably. The 16mm 2-inch lens and the Bmm
 l-inch lens have been found to give the most useful
picture size under normal projecting conditions.
The performance of the optical system of the pro-

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jectors has been based upon their use and, therefore.
gives the maximum results when they are in position.
Lenses of shorter and longer focus (see pages 4 and
5) are offered for use when the throw is too short
or too Iong for the standard lens.
  With your Filmo 16mm sound or silent projector:
we recommend the use of the B&H Field Flattener.
Designed for use with the 2-inch F 1.6 Excessalite
and the 2-inch F I.6 Incre-Lite lenses, it improves
the definition and sharpness of the entire filnr
frame area.
  When readying your projection equipment for a
showing, place the screen so that the edge of the
picture is just above the eye level of the audience,
giving an unobstructed view to those seated in the
rear. Place the projector on a stand or table of such
height that the projeclion lens is well above the
heads of the audience, so that the ordinary move-
menls of seated persons will not bring their heads
irrto the projector light bearn. A B&H projector
stand is recommended for this purpose.
   Before every show, clean the projection lens, using
the B&H lens cleaning kit. Clean Filmocoted lenses,
which are identified by the designation "ELC"
following the focal length and iris rnarkings and by
the bluish appearance of the elements, with Opti-
kleen lens cleaning  fr.ujd. only. Any other lens cleaning
preparation may damage the lens surfaces. Opti-
kleen fluid may also be used on uncoated lenses.
  Return l,he lens to posilion, avoiding fingerprints,
and focus for projection.

DN:Date:cn=Mike2024.04.12signedButkus,by20:21:18Mikeo=ButkusButkus-04'00'camera manuals, ou=butkus.org, email=mike@butkus.org, c=USMike Butkus                                                           Digitally





  B&H 4-inch F 2.5, 9rZ-inch F 2.3, and,T-inch F 2 projection
        lenses are fine tor long throws uthere muxim.um picture
                          brilliance is desired.

   Lenses for. Special Purposes

  For shorter- tha n -n orntal throws
    The 8mm sr1-inch projeclion lens and the 16mm
  l-inch and LLI-inch lenses are designed primarily
  for use when the projector and the screen can-
  not be placed far enough apart to give a picture
   of the desired size using the lens supplied with the
   projector.
   The 15mm F 2.1 and fu-inch F 3 lenses are
   especially suited to Filmo 16mm projectors equipped
  with the Continuous Projection Attachment for use
   in counter and window displays, hotel, theater and
  banh lobby exhibits, and in convention booths, as

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they provide the sharpness of definition, flatness of
field, and maximum illumination necessary for such
purposes, and are recommended for such use. The
I-inch F 2.46 lens mav also be so used.

F or lon g er - than,  - nor rnal thr ow s
  The Bmm lll-inch lens and the l6mnr 3-, 312-
and 4-inch lenses shoulrl be used where the throw is
longer than that usually found in the horne-
specifically, greater than 50 feet. As'loss of light
increases with distance, the projector, whenever
possible, should be placed close enough to the screen
so that the picture projected through the l6mm
2- or 2ll-inch or the Bmm l-inch lens will till the
screen. If the distance between projector and screen
cannot be so regulated, select the 16mm 3-,3ft- or
4-inch lens, or Bmm lll-inch lens, which will
cover the screen area properly.
  In cases where maximum illumination is desired
and the throw is long, the B&H Incre-Lite l6mm
3-inch F 2, 3rl-inch F 2.3, or 4-inch F 2.5 lens
should be used, preferably on a Filmo projector
having a 1000- or 1200-watt lamp. These lenses,
with their large front elements, pass more light.