We use Optical Character Recognition (OCR) during our scanning and processing workflow to make the content of each page searchable. You can view the automatically generated text below as well as copy and paste individual pieces of text to quote in your own work.
Text recognition is never 100% accurate. Many parts of the scanned page may not be reflected in the OCR text output, including: images, page layout, certain fonts or handwriting.
368
MAKING A MASK BOX
VERNON W. DEAN, ACL
|>O|0D
m
^ DIA. HOLE
2#
T
! l .
{
lfc==
-l(M
1
2
*
^ 2 ^ U^ii —
J
TAP ^-20
-^
TRIPOD HOLDER
FIG. 1: The simple tripod mounting unit, seen in design on opposite page, fits over tripod screw but under attached camera.
OFFHAND, I'd say that there is no other accessory item in amateur filming which returns you such rich rewards as does a mask (or matte) box. To begin with, it provides the most efficient sunshade you can use for all of your assorted lenses. Some of them, to be sure, may already be equipped with built-in lens hoods; some may not. In either case, the mask box creates a more exact protection against stray sunlight, especially when you are shooting across or towards the light source.
IDEAL FILTER HOLDER Secondly, the mask box will serve as an ideal filter holder when it is necessary to use either the outdoor or indoor color conversion filter or the haze filter. It is a more efficient mount for your filters than the clip-on-thelens type, since one size of each filter (proportioned to fit in the mask slot) can be used with lenses of every focal length and diameter.
TAP jr -20 4
'HI I
u
FLANGE
FIG. 2: Metal flanges, made in a machine shop, are screwed under front and rear ends of unit to hold vertical support rods.
MASKING AND SPLIT SCREEN Thirdly, the mask box — used in its named function — will open up for you all of the movie making thrills implicit in masked shots (keyhole, binocular, circle or oval, etc.) and in split-screen multiple exposures. Common examples of this latter technique are scenes in which the same person appears on both right and left sides of the frame or scenes where a person is seen dreaming of some image which appears above him.
Finally, if you are the kind of cameraman who gets an innocent pleasure from the appearance of his outfit — well,
.DIA. OF HOLE TO SUIT 'O.D. OF CAMERA LENS
T
— 1
1 1,
1
L.
i
-i —
*
kj
<£
£[ DIA. 2 HOLES
TAP BOTH ENDS FOR *IO-24 SET SCREWS
-**
SUPPORT BRACKET
FIG. 3: A pair of support brackets, also of metal, join vertical and horizontal rods. Setscrews permit two way adjustment.
•
— 4
I .
*>le
T 1
" 1
-IN 1
if
«!•
1
— i— — i
s a
4=
a*
1
MASK GUIDE
t^t
FIG. 4: Front and rear units of mask box assembly are diagramed above. Dimension of hole in rear unit should be just larger than diameter of lens.